Article
Energy & Fuels
Ibham Veza, Irianto, Anh Tuan Hoang, Abdulfatah A. Yusuf, Safarudin G. Herawan, M. E. M. Soudagar, Olusegun D. Samuel, M. F. M. Said, Arridina S. Silitonga
Summary: The addition of acetone-butanol-ethanol (ABE) as a fuel can decrease CO2 and NOx emissions in an HCCI-DI engine, but has no significant effect on HC, CO, PM, and soot emissions. Furthermore, engine performance is improved with the addition of ABE.
Article
Energy & Fuels
Muhammad Faizullizam Roslan, Ibham Veza, Mohd Farid Muhamad Said
Summary: This study aims to explore the potential of ABE fuel in HCCI-DI engines and investigate the impact of other parameters on its performance. The results show that increasing the proportion of ABE can reduce fuel consumption and improve the engine's thermal efficiency. Additionally, using ABE can significantly reduce NOx emissions. In conclusion, ABE fuel is renewable and capable of reducing emissions without compromising engine performance in HCCI-DI engines.
Article
Energy & Fuels
Alper Calam, Serdar Halis, Bilal Aydogan, Can Hasimoglu
Summary: This study aimed to control the HCCI combustion phase by testing different ratios of low and high reactivity pure fuels and their mixtures. The analysis showed that HN75 fuel provided the best operating conditions and low CO and HC emissions in HCCI combustion.
Article
Energy & Fuels
Aneesh Vijay Kale, Anand Krishnasamy
Summary: This study investigated the use of ethanol-gasoline blends as fuels in HCCI mode to extend the engine load range and improve performance metrics. The results showed that increasing ethanol content in the test fuels improved thermal efficiency, reduced soot and NOx emissions. This fuel management strategy can enhance the performance and emission metrics of HCCI engines.
Article
Thermodynamics
Shan Zeng, Yuan Jing, Chenheng Yuan
Summary: This study compares the characteristics of HCCI combustion in free piston linear engines and traditional crankshaft engines. The results indicate that while the final heat release of both engines is similar, the low-temperature reaction stage in FPLE occurs later, leading to a lag in the high-temperature reaction stage.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Kabbir Ali, Riffat Amna, Mohamed I. Hassan Ali
Summary: The objective of this paper is to investigate the use of H2/H2O2 fuel in a free carbon combustion engine for HCCI engine. The study analyzes Combustion phasing, IMEP, and thermal efficiency at different effective equivalence ratios and engine speeds. A 3D CFD model is developed and validated for controlling the combustion phasing of the HCCI engine by adjusting the volume fraction of H2O2 in the fuel mixture. The results show that H2O2 reduces inlet mixture temperature, improves combustion phasing, and enhances combustion and thermal efficiencies.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Review
Energy & Fuels
Pajarla Saiteja, B. Ashok
Summary: The depletion of fossil fuels and the significant exhaust emission from conventional engines are the main concerns in the current auto industry. Improving engine performance and reducing emissions are crucial, with advanced combustion mode engines playing a significant role in internal combustion engines' emission control.
Article
Energy & Fuels
M. Feroskhan, Venugopal Thangavel, Balaji Subramanian, Ram Kishore Sankaralingam, Saleel Ismail, Abhishek Chaudhary
Summary: This study investigates the operation of a HCCI engine using simulated biogas and DEE as fuels, with a focus on performance, emissions, and combustion parameters. The research reveals that high biogas flow rates or methane content can effectively substitute DEE and provide significant energy input, while lower biogas flow rates and methane fractions lead to improved thermal efficiency and reduced HC emissions. Intake heating improves engine performance and emissions, although it may increase the tendency to knock, and manifold injection shows superior engine output compared to port injection.
Article
Engineering, Multidisciplinary
Fatih Sahin
Summary: This study investigates the effects of using multiwalled carbon nanotubes (MWCNT) as a fuel additive on the combustion characteristics of an HCCI engine. The results show that the addition of MWCNT increases the operating range of the engine, improves combustion parameters, and reduces HC and CO emissions.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Thermodynamics
M. Mosbah, Z. Boutera, Y. Rezgui, M. Guemini, A. Tighezza
Summary: Four reaction mechanisms were developed to describe the combustion of biodiesel-surrogate/ethanol blends in an HCCI engine, by merging validated kinetic schemes. The proposed models were compared to experimental data from a modified CFR engine, which serves as an HCCI engine. The best predictive model was used to investigate the effects of ethanol enrichment and the variation of important parameters on the combustion and performance of the HCCI engine.
COMBUSTION THEORY AND MODELLING
(2023)
Article
Energy & Fuels
Samet Celebi, Can Hasimoglu, Ahmet Uyumaz, Serdar Halis, Alper Calam, Hamit Solmaz, Emre Yilmaz
Summary: This study experimentally investigated the effects of naphtha on HCCI combustion in an engine, finding that knocking tendency decreased as lambda value increased and more stable combustion was achieved with the addition of naphtha. The addition of naphtha led to delayed HCCI combustion and wider operating range compared to n-heptane.
Review
Energy & Fuels
Xiongbo Duan, Ming-Chia Lai, Marcis Jansons, Genmiao Guo, Jingping Liu
Summary: The HCCI engine presents superior fuel economy and emissions compared to traditional combustion engines, but lacks direct control over auto-ignition timing. Effective techniques and controlling strategies, such as fuel management and exhaust gas recirculation, are used to optimize combustion and expand operation range.
Article
Energy & Fuels
W. Niklawy, M. Shahin, Mohamed Amin, A. Elmaihy
Summary: Heat release analysis is crucial in homogeneous charge compression ignition engines for controlling combustion phasing and developing combustion models. Experimental work on a turbocharged common rail diesel engine is conducted to measure in-cylinder pressure and compute Apparent Heat Release Rate. The analysis includes low- and high-temperature reaction events, in-cylinder temperature, and cumulative fuel burning rate. A new correlation considering engine speed and load is proposed, showing excellent agreement between predicted and measured results.
Article
Energy & Fuels
Enrico R. Malheiro de Oliveira, Caio Henrique Rufino, Pedro Teixeira Lacava
Summary: This study provides an experimental analysis of spray guided direct injection with commercial fuels used in a consolidated market for the use of ethanol. The results indicate that lean combustion can lead to flame instabilities, increased unburned ethanol in exhaust emissions, and reduced engine performance. The study highlights the importance of considering the effects of commercial fuels with high ethanol content on engine performance and emissions.
Article
Chemistry, Physical
Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the syngas fuelled homogeneous charge compression ignition (HCCI) engine through parametric investigation. The chemical kinetic simulation using the stochastic reactor model (SRM) compares and evaluates different reaction mechanisms. The validated reaction mechanism is further used to study the HCCI engine at different engine speeds, equivalence ratios, syngas compositions, and inlet valve closing temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Mohit Raj Saxena, Rakesh Kumar Maurya
Article
Engineering, Mechanical
Rakesh Kumar Maurya
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2019)
Article
Thermodynamics
Avinash Kumar Agarwal, Akhilendra Pratap Singh, Rakesh Kumar Maurya, Pravesh Chandra Shukla, Atul Dhar, Dhananjay Kumar Srivastava
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2018)
Article
Thermodynamics
Akhil Nekkanti, Antonio L. Sanchez, Forman A. Williams
COMBUSTION AND FLAME
(2019)
Article
Engineering, Aerospace
Akhil Nekkanti, Oliver T. Schmidt
Summary: The study investigates the directivity of noise from turbulent jets at Mach 0.7, 0.9, and 1.5 using spectral Proper Orthogonal Decomposition (SPOD), revealing superdirective acoustic beams originating from the end of the potential core and the shear-layer region. The most energetic radiation patterns are isolated and linked back to specific source regions, indicating an intimate connection between sideline and downstream radiation within the computational domain.
Article
Engineering, Chemical
Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the influence of diesel injection pressure, injection timing, and port-injected gasoline mass on nanoparticle emissions from a light-duty gasoline-diesel RCCI engine. The results show that changes in diesel injection pressure and timing have a significant impact on nanoparticle emissions, while increasing port fuel injected mass leads to higher particle concentration and unburned hydrocarbon emissions.
PARTICULATE SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Mohit Raj Saxena, Rakesh Kumar Maurya
Article
Mechanics
Akhil Nekkanti, Oliver T. Schmidt
Summary: This study demonstrates four applications of spectral proper orthogonal decomposition (SPOD) on turbulent jet data: low-rank reconstruction, denoising, frequency-time analysis, and prewhitening. Results show that SPOD can effectively reconstruct flow fields, remove noise, and analyze the time-frequency characteristics. Additionally, SPOD-based frequency-time analysis reveals the direct association between the occurrence of large-scale flow structures and high-energy events.
JOURNAL OF FLUID MECHANICS
(2021)
Review
Environmental Sciences
Sahil Rana, Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study presents a review of the physical and chemical characteristics of particulate emissions from compression ignition (CI) engines. It was found that engine operating parameters and alternative fuels have significant effects on the particle number concentration, morphology, nanostructure, and oxidative reactivity of the particulate matter (PM).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Engineering, Civil
Mohit Raj Saxena, Rakesh Kumar Maurya, Prashant Mishra
Summary: This study focuses on the utilization of methanol in compression ignition engines, particularly in dual-fuel combustion mode, which can significantly reduce NOx, CO, soot, and nano-particle emissions. The combustion of methanol-diesel blended fuel shows potential to enhance performance while reducing emissions, although unburnt HC emissions may increase in methanol-diesel dual-fuel operation.
JOURNAL OF TRAFFIC AND TRANSPORTATION ENGINEERING-ENGLISH EDITION
(2021)
Article
Thermodynamics
Ajay Singh, Rakesh Kumar Maurya
Summary: This study examines a noisy nonlinear dynamical (NND) model for cyclic variations in SI engines using nonlinear time series methods. The analysis reveals that noise obscures the local patterns and higher periodic orbits of the dynamics, leading to fuzzy bifurcation diagrams. Increasing noise level and uncombusted residuals shift the onset of bifurcations towards higher equivalence ratio in the NND map. The application of the NND model to represent SI engine combustion dynamics with higher internal EGR results in a more complex dynamical nature.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Thermodynamics
Ajay Singh, Rakesh Kumar Maurya
Summary: This study investigates the cyclic combustion dynamics of HCCI engine and utilizes nonlinear dynamic methods. The results show that higher engine speeds lead to greater combustion dynamic variations. Relative air-fuel ratios and intake air temperatures affect the deterministic characteristics of combustion.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Review
Energy & Fuels
Tomesh Kumar Sahu, Pravesh Chandra Shukla, Giacomo Belgiorno, Rakesh Kumar Maurya
Summary: Alcohol fuels, namely ethanol and methanol, have emerged as important alternatives for sustainable transportation due to their lower CO2 emissions. Their higher octane number suits spark ignition engines, while lower blend ratios can be used in compression ignition engines. Research on alcohol utilization in CI engines improves the soot-NOx trade-off characteristic and helps meet future emissions regulations. The potential of alcohol fuels for sustainable transportation lies in their overall lower CO2 emissions compared to diesel.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Computer Science, Interdisciplinary Applications
Akhil Nekkanti, Oliver T. Schmidt
Summary: An algorithm based on spectral proper orthogonal decomposition (SPOD) is developed to reconstruct flow data in compromised or missing regions. The algorithm utilizes the temporal and spatial correlation of the SPOD modes to fill in the gaps. The method is demonstrated on two examples and achieves higher data recovery rates compared to established methods.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Environmental Sciences
M. R. Saxena, S. Rana, R. K. Maurya
Summary: This study investigates the in-cylinder heat release features and nanoparticle emissions of a CNG-diesel RCCI engine. The study aims to determine the impact of low-temperature heat release (LTHR) and high-temperature heat release (HTHR) on particle emissions. LTHR is a smaller peak before the main HTHR on the heat release rate curve. The LTHR and HTHR are not separated on the curve, but the LTHRR and HTHRR rates are determined. The amount of LTHR and HTHR is calculated by analyzing the area under the respective LTHRR and HTHRR curves. The experiments show that increasing CNG masses result in reduced LTHR and HTHR, leading to the formation of nucleation mode particles (NMPs) and an increase in total particulate matter (PN).
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
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)
