Article
Chemistry, Physical
Rocky Simon Pinto, T. Sree Renganathan, S. M. D. Hamid Ansari, T. M. Muruganandam
Summary: Hysteresis in flame stabilization mode transitions in a hydrogen-fueled supersonic combustion test rig was experimentally observed and studied. The effects of equivalence ratio on flame stabilization modes were investigated through measurements of shock system, heat release zones, and flame structure. Three different combustion modes were observed, and the hysteresis phenomena between these modes were analyzed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Rocky Simon Pinto, T. Sree Renganathan, S. M. D. Hamid Ansari, T. M. Muruganandam
Summary: The experimental study investigates the influence of stagnation temperature on hysteresis in flame stabilization in a hydrogen-fueled supersonic combustor. The results show that the variation in stagnation temperature significantly affects the hysteresis between different flame stabilization modes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Aerospace
Lei Shi, Xue Yang, Yiyan Yang, Xiang Tang, Fei Qin, Guoqiang He
Summary: Stable operation of the RBCC engine in the scramjet mode is crucial for achieving wide airspace and high-speed flight envelope. The study explores the mechanism of how an embedded rocket enhances ignition and flame stabilization of secondary fuel. Experimental results show that the embedded rocket operating at a low mass flow rate and fuel-rich state can efficiently guide the flame source, enhance fuel-air mixing, and improve combustion.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Lin Zhang, Yitao Cao, Jianhan Liang, Yi Wang, Mingbo Sun
Summary: The mixing flow of a sonic transverse jet injection in a supersonic cavity combustor is numerically investigated at two typical inflow velocities. The simulation results show that at low Mach inflow, the separation shock gradually merges with the bow shock, smaller large-scale coherent structures and slower large-scale vortex transport are observed, and narrower range of jet species mass fraction distributions and more upstream large-scale vortices breakdown and dissipation can be observed. The low Mach inflow generates weaker pair of counter-rotating vortices and some trailing counter-rotating vortices, which primarily leads to the weaker jet/cavity interaction.
Article
Engineering, Aerospace
Hongchao Qiu, Libo Lin, Shiqi Zhang, Junlong Zhang, Wen Bao
Summary: The ignition process and flame characteristics in a supersonic combustor with liquid kerosene fuel were investigated. Numerous experiments were conducted under specific conditions, and the combustion establishment process and flame characteristics were observed using a high-speed camera. The results showed that the flame was first established near the igniter flame in the lower half of the combustor, and then spread to the main flow. The ignition process was influenced by equivalence ratios, and two modes of flame establishment were identified, each with different propagation speeds.
JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Engineering, Aerospace
Jianping LI, Kai Wang, Guiqian Jiao, Zilong Liao, Jindong LI
Summary: In this study, the combustion characteristics of a kerosene-fueled supersonic combustor were investigated using the flame stabilizing method of cavity and strut. The results showed that the combustor with the strut achieved independent and stable combustion of kerosene, and the porous injection behind the strut improved the atomization and combustion efficiency of kerosene.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Mechanics
Hongchao Qiu, Libo Lin, Guangjun Feng, Junlong Zhang, Wen Bao
Summary: The annular scram combustor, compatible with both turbines and rockets, has a challenge of establishing and stabilizing flames at supersonic speeds due to its large width. Experimental studies were conducted on a fan-shaped supersonic combustor fueled with liquid kerosene using single-strut and multi-strut injection methods. The multi-strut injection method improved the ignition performance by increasing fuel diffusion range and reducing airflow speed, and the central-flame state had a significant effect on the flame-crossing process.
Article
Mechanics
Guangming Du, Ye Tian, Jialing Le, Fuyu Zhong, Yi Zhang
Summary: The effects of two kinds of dual-cavity configuration on ignition and flame stabilization in a high Mach number (Ma) kerosene-fueled scramjet were experimentally investigated. The symmetrical dual-cavity configuration did not achieve kerosene auto-ignition, while the staggered dual-cavity configuration did achieve kerosene auto-ignition due to more complex shock waves. In the staggered dual-cavity scramjet, flame stabilization was achieved after successful ignition with a lower equivalence ratio (ER) of kerosene, but higher ER of kerosene led to unstable flow structure oscillations.
Article
Energy & Fuels
Qian Wang, Mingyu Li, Yuling Zhao, Jiankun Xiao
Summary: In this study, a trapped-vortex gas-turbine combustor was designed to achieve stability, low emissions, and desired temperature distribution within a short flame length. The combustor utilizes two separated cavities to establish trapped-vortex combustion, and a swirler is adopted to improve mixing. Experimental tests show encouraging performance in terms of flame stability, emissions, temperature profiles, and flame length. The combustor demonstrates improved lean ignition and blowout performances with increased inlet temperature, and achieves uniform outlet temperature profiles with two separated short flames.
Article
Engineering, Aerospace
Ji Li, Jingfeng Tang, Junlong Zhang, Ximing Zhu, Haoran Zhang, Wen Bao, Daren Yu
Summary: The paper explores the establishment process of flame with a plasma igniter in an axisymmetric kerosene combustor under certain conditions and investigates several typical flameholding modes and their influencing factors. It reveals that a weak flame can spontaneously transform into a stronger flame during the flame establishment process, and classifies flameholding into four types.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Bo Luo, Jingwei Chen, Jiaqiang E, Gaoliang Liao, Feng Zhang, Jiangjun Ding
Summary: In the context of the international energy crisis, the development of a microthermophotovoltaic system using hydrogen as combustion energy is urgent. To optimize the micro-combustor in the system, nozzle micro-combustors with five different channels are designed and numerically studied. The results show that the nozzle micro-combustor with constriction-expansion channel has the best performance, leading to the design of a new type of nozzle micro-combustor with segmented channel. Numerical studies indicate that segmented micro-combustors have better thermal performance compared to non-segmented micro-burners, making them more suitable for micro-thermophotovoltaic applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Editorial Material
Engineering, Aerospace
Fan LI, Mingbo SUN, Jiajian ZHU, Zun CAI, Hongbo WANG, Yanxiang ZHANG, Yongchao SUN
Summary: The experimental investigation on two different scramjet combustors with varying mass flow rates reveals that scaling effects can impact combustion modes, with larger-scale combustors broadening the flame rich blowout limit and transitioning from cavity-stabilized mode to jet-wake-stabilized mode. Differences in cavity residence time, ignition delay time, and Damkohler number due to scale differences likely account for the observed scaling effects.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Engineering, Aerospace
Xin Li, Yu Pan, Chaoyang Liu, Xiao Liu
Summary: To avoid the thermal choking problem in scramjet, a wall-expansion scheme is usually adopted, but it poses challenges to flame holding. This paper uses large eddy simulation to study the effect of expansion angle change on the flameout limit in the strut-based supersonic combustor. The numerical results show the establishment of the recirculation zone and the role of reflected shock waves in enhancing combustion.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Abdelbasset Lachraf, Mohamed Si Ameur
Summary: This paper presents a new design of micro combustor with trapezoidal ribs on its inner wall, which shows promising improvements in thermal performance. Numerical simulations demonstrate the favorable effects of the ribs on temperature distribution and flow residence time. The study also compares the performance of this design with a simple backward facing step micro combustor, highlighting the benefits of the trapezoidal ribs. The results provide valuable insights into heat transfer mechanisms and suggest optimal operating conditions for efficiency and reliability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Wubingyi Shen, Yue Huang, Wei Yao, Hedong Liu, Yancheng You
Summary: The purpose of this study is to investigate the influence of diffusion characteristics and equivalence ratios of gaseous/liquid kerosene on transient combustions in a three-dimensional combustor. The similarities and differences between gaseous and liquid kerosene supersonic combustion are identified. Results show significant differences in injection velocity and residence time between gaseous and liquid kerosene, as well as differences in reaction heat release position.
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)