Article
Multidisciplinary Sciences
An Lu, Chunhua Zhang, Peng Ji, Yangyang Li
Summary: With the increase of gasoline blending ratio, peak in-cylinder pressure, peak in-cylinder temperature, and peak heat release rate initially increase and then decrease. Intake temperature has a significant impact on engine performance, with higher intake temperature leading to improved combustion efficiency and reduced emissions.
SCIENTIFIC REPORTS
(2021)
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
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
Defu Zhang, Fang Wang, Yiqiang Pei, Jiankun Yang, Dayang An, Hongbin Hao
Summary: The mechanisms of n-heptane and n-butanol were reduced using different methods and the reduced mechanisms were verified. The reduced mechanism showed good prediction ability for ignition delay time and concentrations of major species. A simplified mechanism for n-heptane/butanol fuel mixture was constructed, which can accurately predict the ignition and combustion timings of HCCI under different conditions.
Article
Chemistry, Multidisciplinary
Wanchen Sun, Xin Zhang, Liang Guo, Yi Sun, Yuying Yan, Jun Li, Hao Zhang, Dongqi Fu
Summary: The experiment results showed that increasing the n-butanol fraction in n-butanol/diesel-blended fuel led to a significant decrease in particulate mass emissions, but worsened the emissions of NOx and hydrocarbons. Introducing exhaust gas recirculation helped reduce NOx emissions, but a high EGR rate decreased the engine's indicated thermal efficiency.
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
Engineering, Chemical
Jing Li, Dajian Wang, Cong Zhuang, Shiqi Gong, Songhong Li
Summary: The reactivity-controlled compression ignition engine fueled with n-butanol/n-octanol was studied numerically using the KIVA-CHEMKIN code. The effects of premixed n-butanol percentage and intake valve close timing on combustion characteristics and emissions formations were investigated. It was found that increasing the premixed n-butanol percentage and retarding the intake valve close timing can mitigate knocking and improve engine performance.
Article
Thermodynamics
Zhiqing Zhang, Jiangtao Li, Jie Tian, Rui Dong, Zhi Zou, Sheng Gao, Dongli Tan
Summary: This study investigates the effects of diesel/ethanol/n-butanol blends on combustion and emission characteristics of a diesel engine. The results showed that blended fuels improved brake thermal efficiency and reduced nitrogen oxides, carbon monoxide, and soot emissions.
Article
Green & Sustainable Science & Technology
Weiwei Shang, Xiumin Yu, Kehao Miao, Zezhou Guo, Huiying Liu, Xiaoxue Xing
Summary: Using n-butanol as an alternative fuel can effectively solve the problems of fossil resource depletion and environmental pollution. This study investigated the combustion and emission performance of n-butanol engines under different direct injection ratios and excess air ratios. The results showed that a direct injection ratio of 20% achieved the best combustion performance, and HC emissions were lowest at a direct injection ratio of 40-60%.
Article
Energy & Fuels
Zhiqing Zhang, Jie Tian, Jiangtao Li, Junshuai Lv, Su Wang, Yunhao Zhong, Rui Dong, Sheng Gao, Chao Cao, Dongli Tan
Summary: This study investigates and compares the effects of blended fuels with different alcohol substitution ratios on the combustion, performance, and emission characteristics of a diesel engine. The results show that the D80M10B10 blended fuel is the most beneficial in improving cylinder pressure, prolonging ignition delay, and shortening combustion duration. Additionally, the addition of alcohol fuels reduces soot, HC, and CO emissions, but increases NOx emissions.
Article
Energy & Fuels
Arkadiusz Jamrozik, Wojciech Tutak, Karol Grab-Rogalinski
Summary: The study demonstrates that adding 60% n-butanol to diesel fuel can increase ignition delay by 39%, shorten combustion duration by 57%, and affect emissions. The dual-fuel engine operates stably across the entire range of n-butanol content.
Article
Energy & Fuels
Zhiqing Zhang, Jie Tian, Guangling Xie, Jiangtao Li, Wubin Xu, Feng Jiang, Yuanxing Huang, Dongli Tan
Summary: This work investigated the effects of different fuel blending ratios on the spray, combustion, and emission characteristics of a diesel engine fueled with diesel/methanol/n-butanol blended fuel. The results showed that blended fuel had longer ignition delay, higher cylinder pressure, and higher peak heat release rate compared with diesel. The blended fuel also reduced NOx, CO, soot, and HC emissions.
Article
Energy & Fuels
Ratnak Sok, Jin Kusaka
Summary: This study analyzed measured data from a single-cylinder engine operating under the GDI-HCCI mode. The results showed that optimizing the injection timing can improve combustion and reduce noise and emissions. Furthermore, the net indicated thermal efficiency under this mode was higher than that of the SI mode.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
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
Reza Golzari, Hua Zhao, Jonathan Hall, Mike Bassett, John Williams, Richard Pearson
Summary: The study demonstrates the efficiency and emissions benefits of water injection in a boosted downsized single-cylinder gasoline direct-injection engine, showing significant improvements in net indicated efficiency and reductions in NOx emissions, particle emissions, and exhaust gas temperature. Water injection increases heat capacity, reduces in-cylinder temperature and pressure, and allows for more advanced spark timings, ultimately improving combustion efficiency and performance.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Thermodynamics
Xue-Qing Fu, Bang-Quan He, Si-Peng Xu, Tao Chen, Hua Zhao, Yan Zhang, Yufeng Li, Honglin Bai
Summary: Lean-burn combustion is effective in reducing fuel consumption of gasoline engines, but faces challenges such as unstable ignition and high emissions. Multi-point micro-flame-ignited hybrid combustion can extend the lean burn limit and improve thermal efficiency.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Thermodynamics
Xinyan Wang, Hua Zhao
Summary: This study analyzed the performance of a two-stroke boosted uniflow scavenged direct injection gasoline engine through computational fluid dynamics simulations, showing that optimized piston design and split injection strategy can improve combustion efficiency.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Energy & Fuels
Xiao Li, Bang-Quan He, Hua Zhao
Summary: The research indicates that the misfire limit in MFI mode can be extended to lambda 2.2. Lambda 2.0 is a proper lean-burn limit for MFI combustion. As the lambda increases, the ignition timing delays and combustion duration prolongs, leading to decreased indicated mean effective pressure and increased cyclic variation.
Article
Thermodynamics
Meghnaa Dhanji, Hua Zhao
Summary: One of the challenges with GDI engines is the rapid activation of exhaust catalyst during cold starts to reduce NOx emissions. A split injection strategy can help tackle this issue by improving interactions between injection events and leading to larger SMDs with shorter dwell times. The study showed that shorter PWs and dwell times resulted in higher injected fuel quantities and larger droplet sizes.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Vinicius B. Pedrozo, Xinyan Wang, Wei Guan, Hua Zhao
Summary: This experimental study investigated the effects of different NG fuel properties on engine performance and emissions, revealing that RCCI combustion is more sensitive to changes in MN and lower MN gas mixtures can reduce methane slip but increase NOx emissions. The impact of MN on net indicated efficiency was more significant at 0.6 MPa IMEP, with up to 4.9% differences between the lowest and highest MN fuels for RCCI operations. Overall, the combination of RCCI combustion and LIVC can achieve up to 80% lower methane slip and NOx emissions compared to conventional dual-fuel operation, independent of NG composition.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Engineering, Mechanical
Yifang Feng, Tao Chen, Kang Xu, Xinyan Wang, Hui Xie, Hua Zhao
Summary: Comparisons were made between MFI combustion and SI-CAI hybrid combustion in an engine, revealing that MFI combustion has a higher peak heat release rate and a shorter combustion duration. MFI combustion utilizes spark ignition to promote auto-ignition, leading to a shorter combustion duration and faster combustion.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2021)
Article
Energy & Fuels
Jingrui Li, Haifeng Liu, Xinlei Liu, Ying Ye, Hu Wang, Xinyan Wang, Hua Zhao, Mingfa Yao
Summary: The study successfully simulated the combustion and emissions characteristics of HPDI natural gas marine engines by constructing and reducing n-heptane/methane models, achieving good agreement with experimental data. The reduced models provide an efficient and reliable method for simulating combustion and emissions in these engines.
FRONTIERS IN ENERGY
(2021)
Article
Energy & Fuels
Hongtao Zhang, Zhihua Wang, Yong He, Jun Xia, Jincheng Zhang, Hua Zhao, Kefa Cen
Summary: The study investigated the ignition, puffing, and sooting characteristics of Chinese RP-3 kerosene droplets under varying pressures. Results showed that a decrease in ambient pressure increased ignition delay time and reduced sooting emissions.
Article
Thermodynamics
Zhaojie Shen, Xinyan Wang, Hua Zhao, Bo Lin, Yitao Shen, Jianguo Yang
Summary: This study investigates the combustion and methane emissions of the YC-6K NG-diesel engine with different radial clearances. The results show that by modifying the piston geometry and piston bowls, the combustion efficiency can be increased and methane emissions can be reduced.
Article
Thermodynamics
Xiao Li, Bang-Quan He, Hua Zhao
Summary: The study investigates the plasma-assisted reaction kinetic mechanism for the high-voltage nanosecond discharge of ethanol-gasoline surrogate at high pressure. The numerical results demonstrate that the plasma-assisted ignition mainly occurs through electron impact dissociation and the production of excited states during the discharge. The generated atoms, radicals, and excited states contribute to the ignition process and affect the ignition delay time. Plasma-assisted ignition improves the ignition stability of lean mixtures, but delays ignition in stoichiometric mixtures. The ignition delay time in lean-burn conditions can only be shortened by a proper timing and low-temperature plasma discharge.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Yanqing Cui, Haifeng Liu, Mingsheng Wen, Lei Feng, Can Wang, Zhenyang Ming, Zhao Zhang, Zunqing Zheng, Hua Zhao, Xinyan Wang, Long Liu, Mingfa Yao
Summary: This study investigates two modes of dual-fuel combustion using methanol and examines their combustion characteristics using an optical engine and chemical kinetics simulation. The results show that methanol ATAC and RCCI exhibit different combustion behaviors and can be further improved by adjusting parameters.
Article
Energy & Fuels
Xinyan Wang, Hua Zhao
Summary: The SI-CAI hybrid combustion combines early flame propagation combustion and subsequent auto-ignition combustion, extending the operating range of CAI combustion and achieving smooth transitions between SI and CAI modes. Large eddy simulation (LES) effectively predicted cyclic variations in hybrid combustion, while Reynolds-averaged Navier-Stokes (RANS) simulations did not reproduce cyclic characteristics observed in experiments. Variations in local velocity around the spark plug led to temperature fluctuations and greater variations in subsequent auto-ignition combustion events.
Article
Transportation Science & Technology
Meghnaa Dhanji, Hua Zhao
Summary: The study investigates the effects of using a split injection strategy with a high-pressure Solenoid injector on in-cylinder charge formation in a gasoline engine. The results show that a small split ratio of 1:3 with injections in the intake stroke generates a flow field with high turbulence levels, providing favorable conditions for fast flame propagation. Timing of fuel injection interactions with the piston's surface is crucial for mixture formation and engine efficiency.
SAE INTERNATIONAL JOURNAL OF FUELS AND LUBRICANTS
(2021)
Article
Transportation Science & Technology
Ray Shimura, Hua Zhao, Xinyan Wang
Summary: The article discusses the synergistic effect of reducing valve overlap and external EGR on a three-cylinder GTDI engine, achieving improvements in fuel consumption and tailpipe emissions, while also enhancing the engine's knock mitigation properties.
SAE INTERNATIONAL JOURNAL OF ENGINES
(2021)
