Article
Energy & Fuels
Carlos Castellano-Aldave, Alfonso Carlosena, Xabier Iriarte, Aitor Plaza
Summary: In this paper, a novel device is proposed and demonstrated to harvest mechanical energy from multidirectional vibrations in a wind turbine and convert it into electrical energy. The device can generate average powers around the milliwatt in wind turbine operation conditions, which is sufficient for low-power sensor nodes or battery life extension. Based on a principle of moving masses with magnets in Hallbach arrays interacting with coils, the device works for movements in any direction on a plane. It is the first device specifically proposed for wind turbines and exhibits better efficiency compared to similar harvesters for low-frequency vibrations.
Article
Chemistry, Physical
Shiyi Liu, Xin Li, Li Teng, Guobiao Hu, Junrui Liang
Summary: This paper presents a comprehensive study of the self-powered wireless switch, quantifies the released energy in the toggling action, and validates the findings through simulation and experiments. The new understanding of quasi-static MEH systems and their potential energy precharging mechanism bridges the gap between application and academic research.
Article
Chemistry, Analytical
Mohammad Atmeh, Alwathiqbellah Ibrahim, Abdallah Ramini
Summary: Using energy harvesting to convert ambient vibrations efficiently to electrical energy has become a worthy concept in recent years. However, traditional harvesters cannot effectively convert low-frequency vibrations into power. Therefore, a frequency up-conversion harvester is presented to convert low-frequency vibrations to high-frequency vibrations using magnetic coupling.
Article
Green & Sustainable Science & Technology
Hercules Araujo Oliveira, Jose Gomes de Matos, Luiz Antonio de Souza Ribeiro, Osvaldo Ronald Saavedra, Jerson Rogerio Pinheiro Vaz
Summary: Blade Element Momentum Theory (BEMT) is widely used for designing horizontal-axis wind turbines due to its low computational cost and easy implementation. It has been shown in literature that BEMT accurately predicts output power. BEMT is applicable to turbines of different sizes.
Article
Green & Sustainable Science & Technology
Hamid Reza Karbasian, Javad Abolfazli Esfahani, Aliyu Musa Aliyu, Kyung Chun Kim
Summary: This study numerically investigates the kinematics of dynamic stall and found that the different movements of the blade with the same angle of attack can significantly affect the aerodynamic loads and dynamic stall process. The pure-pitching motion induces higher drag force on the airfoil compared to the pure-heaving motion, while the pure-heaving motion causes excessive turbulence in the boundary layer, leading to more stable coherent structures and higher lift at post-stall.
Article
Engineering, Multidisciplinary
Xue Feng, Chen Liang, Li ChunCheng, Ren Jing, Yu JunBin, Hou XiaoJuan, Geng WenPing, Mu JiLiang, He Jian, Chou XiuJian
Summary: This paper proposes a hybrid nanogenerator that maximizes ocean ambient energy harvesting, integrating triboelectric, piezoelectric, electromagnetic, photovoltaic, and thermotropic units. By utilizing both static and dynamic energy, an intelligent ocean buoy is fabricated, which can wirelessly transmit temperature, humidity, GPS, and sound signals to the receiving terminal.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Engineering, Civil
M. Albiez, J. Damm, T. Ummenhofer, H. Ehard, C. Schuler, M. Kaufmann, T. Vallee, S. Myslicki
Summary: The wind energy sector is seeking to improve the efficiency of their offshore facilities through the use of larger structures. This paper presents a novel hybrid joint that combines adhesive bonding with welding to allow for even larger offshore structures. The design and manufacturing concept were simulated numerically, and the solution greatly reduces complex and costly welding operations on the legs of the jacket structure. The hybrid joint offers an alternative to welding on the primary structural elements, resulting in reduced stresses and potential weakening.
ENGINEERING STRUCTURES
(2022)
Article
Thermodynamics
Abdelaziz G. Refaie, H. S. Abdel Hameed, Mohamed A. A. Nawar, Youssef A. Attai, Mohamed H. Mohamed
Summary: Wind energy is a rapidly developing renewable energy technology, with a new type of horizontal axis wind turbine (ASWT) designed for urban usage. The use of a wind lens has been investigated to enhance the efficiency of the ASWT, while also examining design parameters to shroud the turbine for improved performance output.
Article
Energy & Fuels
Lijun Zhang, Ye Li, Wenhao Xu, Zhiteng Gao, Long Fang, Rongfu Li, Boyin Ding, Bin Zhao, Jun Leng, Fenglan He
Summary: Offshore wind technology is shifting from bottom fixed to floating due to depletion of shallow water wind energy resources and maturity of Floating Offshore Wind Turbine. Detailed analysis on energy production and cost components of wind farm based on unsteady simulations provide insights for future wind farm plannings.
Article
Energy & Fuels
Lijun Zhang, Ye Li, Wenhao Xu, Zhiteng Gao, Long Fang, Rongfu Li, Boyin Ding, Bin Zhao, Jun Leng, Fenglan He
Summary: With the depletion of shallow water wind energy resources, offshore wind technology is shifting towards Floating Offshore Wind Turbines (FOWTs). In this study, we conducted a comprehensive analysis of wind farms based on simulations and cost decomposition. The study compares the performance of two FOWTs under different scenarios and discusses the impact of interaction on the levelized cost of energy. The findings suggest that a tandem layout with a distance of 9.25D is the optimal parameter choice.
Article
Green & Sustainable Science & Technology
Pappu Arumugam, Velraj Ramalingam, Kiran Bhaganagar
Summary: Small wind turbines are gaining attention due to sustainable power generation, but face obstacles in commercialization such as low efficiency, lack of technical knowledge among manufacturers, and cost constraints. The paper reviews research on blade design and development, performance analysis, and novel concepts for enhancing efficiency in utilizing wind energy.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Engineering, Mechanical
Ming Xu, Bin Wang, Xiaoya Li, Shengxi Zhou, Daniil Yurchenko
Summary: The study investigates the dynamic characteristics of the galloping energy harvester by separating wind speed into mean and fluctuating components, considering the latter as Gaussian white noise. Decoupling the output voltage using a generalized harmonic transformation and deriving mean output power through stochastic averaging are key approaches employed. Critical wind speed and optimal parameters of the harvester were determined, with the analytical procedure validated through Monte Carlo simulation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Multidisciplinary Sciences
Marcel Hamda Soulouknga, Tobiloba Emmanuel Somefun, Serge Yamigno Doka
Summary: This study assesses wind potential in Chad using wind speed data and examines the performance of five wind turbines in different locations. The results show that the Enercom E-82 turbine is suitable for the area.
Article
Green & Sustainable Science & Technology
Wenhao Xu, Gaohua Li, Xiaobo Zheng, Ye Li, Shoutu Li, Chen Zhang, Fuxin Wang
Summary: The feasibility of installing vertical axis wind turbines on the side of buildings was verified using a high-resolution numerical method. The study showed that wind turbines in specific flow regions can significantly increase energy output, and optimizing the arrangement of multiple wind turbines around the building can improve overall energy output. Through changing the rotational directions of the wind turbines, the energy output of all turbines can be enhanced.
Article
Engineering, Civil
Kun Lin, Shaohui Xiao, Hongjun Liu, Annan Zhou
Summary: This paper conducts a series of 1:100 scaled wind tunnel tests based on NREL 5 MW wind turbine using two different T-TSR scaling methods (GB-IW and RB-SW) to study the dynamic performance. The test results show that the GB-IW method can meet the T requirement but leads to TSR distortion. On the other hand, the RB-SW method can accurately simulate the T-TSR curve under different operational conditions.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Aerospace
Rafael L. Rubin, Dan Zhao
Summary: The thrust formula of the actuator disk model was expanded and divided into two parts to show that propellers at incidence have both an axial and a wing lift equivalent component. Wind tunnel tests on a two-bladed propeller revealed that the wing component increases with airflow velocity and angle of incidence, while the axial component decreases with velocity.
Article
Energy & Fuels
Jianqin Fu, Lianhua Zhong, Dan Zhao, Qi Liu, Jun Shu, Feng Zhou, Jingping Liu
Summary: The study investigates the addition of hydrogen to LMG engine, finding that as hydrogen energy fraction (HEF) increases, combustion rate and cylinder pressure increase, while indicated thermal efficiency reaches a maximum between 8% and 12% HEF. Although hydrogen addition can increase combustion rate of the mixture gas, it also increases the detonation trend.
Article
Engineering, Aerospace
Zhuming Rao, Ruichao Li, Bo Zhang, Bing Wang, Dan Zhao, Muhammad Saqib Akhtar
Summary: In this study, the dynamics of pressure oscillations and flame behaviors in a premixed swirl-stabilized combustor were experimentally investigated. Different combustion states were distinguished based on acoustic pressures and flame dynamics. The use of permutation entropy and proper orthogonal decomposition proved effective in analyzing signal complexities and spatial images of chemiluminescence.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Di Guan, Dakun Sun, Ruize Xu, Daniel Bishop, Xiaofeng Sun, Siling Ni, Juan Du, Dan Zhao
Summary: Experimental investigations on dynamic stall phenomena in a single-stage axial compressor were conducted using aeroacoustic measurements, revealing that the compressor stall corresponds to a low-frequency intrinsic mode and an increase in the dominant acoustic modes during stall. Traditional signal analysis methods did not provide any warning precursors, while advanced signal processing techniques such as EMD and POD analysis showed precursors before stall. CW transform could give a 0.05 s warning precursor.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Zhuming Rao, Ruichao Li, Bo Zhang, Bing Wang, Dan Zhao, Mohammad Shahsavari
Summary: Experimental measurements were conducted on a swirl-stabilized combustor to investigate its nonlinear dynamic characteristics under acoustic excitations. The results showed that the combustor experiences frequency locking and high amplitude oscillations when the excitation frequency is close to the natural frequency, as well as super-harmonic resonances.
FLOW TURBULENCE AND COMBUSTION
(2021)
Article
Energy & Fuels
Lei Han, Junwei Li, Dan Zhao, Yunzhi Xi, Xingpeng Gu, Ningfei Wang
Summary: The study found that the wavy combustors have higher average temperatures and improved temperature uniformity compared to conventional smooth combustors. The flame stability of hydrogen/ammonia blended combustion is better in the wavy combustors. NOx emission reduction can be achieved by increasing the nitrogen fuel mass ratio. This research demonstrates the effective design of a micro-combustor with enhanced thermal performance and reduced NOx emissions.
Article
Engineering, Aerospace
Yong Chen, Yongchao Sun, Dan Zhao
Summary: This paper investigates the intrinsic thermoacoustic feedback and its interaction with cavity acoustic resonance in swirling flame combustors. The phase shift between acoustic and vortical waves plays a crucial role in determining the stability of the system.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Hui Guo, Minle Wu, Yibin Zhu, Qiwei Li, Keyu Weng, Yange Suo, Yanghui Ye, Yuanjun Tang, Zhigeng Fan, Guoneng Li, Youqu Zheng, Dan Zhao, Zhiguo Zhang
Summary: The effect of acoustic energy on soot suppression in an acetylene-air diffusion flame was experimentally studied, showing a linear increase in suppression efficiency with increasing acoustic energy. Different acoustic waveforms resulted in similar acoustic energy levels for achieving the same soot suppression effect. Acoustic waves caused periodic stretching and compressing of the flame, with a fluctuation velocity above 2 m/s leading to 50% suppression efficiency, but increasing premixed levels reduced flame height and fluctuation velocity.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Xinjian Chen, Junwei Li, Dan Zhao, Muhammad Tahir Rashid, Xinyuan Zhou, Ningfei Wang
Summary: The experimental investigation in this work reveals that foamed porous media significantly enhance heat transfer efficiency in meso-scale burners, showing notable impacts on flame structure and temperature distribution.
Article
Thermodynamics
Siliang Ni, Dan Zhao, Mathieu Sellier, Junwei Li, Xinjian Chen, Xinyan Li, Feng Cao, Weixuan Li
Summary: This study compared the thermal performance and efficiency of unconventional T- and Y-shaped micro-combustors with the traditional I-shaped one. Results showed significant improvements in thermal performance and efficiency for T- and Y-shaped combustors under the same conditions. Optimization of parameters can enhance combustion efficiency.
Article
Chemistry, Applied
Tao Cai, Yuze Sun, Dan Zhao
Summary: This study aims to improve the energy conversion efficiency of a thermo-photo-voltaic system by optimizing combustor performance through the use of staggered bluff-bodies. The implementation of staggered bluff-bodies significantly enhances heat transfer performance and increases mean wall temperature. Results also show that the equivalence ratio and dimensions of the staggered bluff-bodies have a significant impact on system performance.
FUEL PROCESSING TECHNOLOGY
(2021)
Review
Engineering, Aerospace
Xiaohuan Zhao, Limin Su, Jiang Jiang, Wenyu Deng, Dan Zhao
Summary: This paper summarizes and studies the heat flow effects on the thermal performance of micro-channel oscillating heat pipes (MCOHPs), revealing the thermal performance improvements using different working fluids such as nano-fluids, gases, single liquids, mixed liquids, surfactants, and self-humidifying fluids. The use of graphene nano-fluids can reduce the thermal resistance by 83.6% and enhance the maximum thermal conductivity by 105%. Gravity and flow characteristics also have an impact on the heat flow. The study of heat flow effects on the thermal performance of MCOHPs contributes to exploring aerospace applications in depth.
Article
Engineering, Aerospace
Zhaoyang Wang, Dan Zhao, Yunfeng Cao
Summary: This research presents an enhancement algorithm for low-light airborne images based on the camera response model and Retinex theory, which effectively improves the brightness of low-illumination images and achieves better performance in obstacle detection.
Article
Engineering, Aerospace
Zhaoyang Wang, Dan Zhao, Yunfeng Cao
Summary: This paper proposes a novel vision-based autonomous landing navigation scheme for night-time autonomous landing of fixed-wing UAV. The proposed algorithm includes visible and infrared image fusion, improved Faster R-CNN based runway detection, and relative attitude and position estimation for the UAV.
Article
Engineering, Aerospace
Yuze Sun, Dan Zhao, Xiaowei Zhu
Summary: In this study, 3D URANS simulations were used to investigate the combustion-sustained thermoacoustic instabilities in a swirl combustor. The effects of swirling number, inlet air flow rate, and inlet temperature on the amplitudes and frequencies of oscillations were examined. It was found that amplitude increases with swirling number and air flow rate, but decreases with inlet temperature; dominant frequency increases with swirling number and air flow rate, but has a complex relationship with inlet temperature.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
