Article
Energy & Fuels
Chun Xia, Tingyu Zhao, Junhua Fang, Lei Zhu, Zhen Huang
Summary: Improving thermal efficiency and reducing particulate matter emissions are key issues for next generation gasoline engines due to stricter fuel consumption and emission regulations. This study proposes the use of a dual injection stratified combustion mode to improve the burning rate of lean burn and reduce fuel consumption. By optimizing engine control parameters, significant reductions in fuel consumption and particulate emissions can be achieved, making this technique a promising solution.
FRONTIERS IN ENERGY
(2022)
Article
Energy & Fuels
Zhe Sun, Qinglin Xu, Mingli Cui, Mohamed Nour, Xuesong Li, David L. S. Hung, Min Xu
Summary: The study demonstrates that flash boiling multiple injections can enhance the combustion of lean gasoline/air mixture by increasing evaporation rate, reducing spray impingement, and optimizing interaction with tumble flow. Under optimized conditions, flash boiling multiple injections significantly improve engine thermal efficiency.
Article
Chemistry, Applied
Ji Yong Shin, Sanguk Lee, Choongsik Bae, Jinyoung Jung, Yousang Son, Hangpyo Heo, Juhun Lee
Summary: This study investigates the impact mechanism of late intake valve closing (LIVC) on particle emissions. The results show that delaying the LIVC timing can reduce particle emissions, increase in-cylinder flow velocity, and decrease the effective compression ratio. By improving mixture formation and initial temperature conditions, the production of particle precursors is reduced, thereby enhancing particle oxidation.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Zhiqiang Li, Jing Qin, Yiqiang Pei, Kai Zhong, Zhiyong Zhang, Jian Sun
Summary: In the research on gasoline engines, improving thermal efficiency is crucial in the face of the energy crisis and global warming, and the lean mixture combustion strategy shows promise. This study explores the adoption of a high compression ratio, a high-power interval ignition system, and a stratified combustion scheme achieved via dual injection in a single cylinder gasoline engine. The results demonstrate the extension of the lean combustion limit and the improvement of thermal efficiency under ultra-lean conditions. Different injection proportions led to reverse combustion performance trends due to changes in combustion velocity caused by concentration gradients.
Article
Chemistry, Physical
Xiumin Yu, Decheng Li, Ping Sun, Guanting Li, Song Yang, Chuanzhao Yao
Summary: This paper investigates the energy and exergy balance of a SI engine working under two different modes under lean-burn conditions. Results show that the cooling water takes an average of 39.40% of the fuel energy in GPI + GDI mode, and 40.70% in GPI + HDI mode. The exergy destruction occupies 56.12% of the fuel exergy in GPI + GDI mode and 54.89% in GPI + HDI mode. Brake thermal efficiency and exergy efficiency of the engine can be improved by 0.29% and 0.31% in GPI + GDI mode, and 0.56% and 0.71% in GPI + HDI mode at an excess air ratio of 1.1.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Shiyi Pan, Jinhua Wang, Zuohua Huang
Summary: This study compared the effects of four different hydrogen injection strategies on the distribution, combustion, and emissions of hydrogen mixtures. The results showed that different hydrogen injection strategies resulted in different types of hydrogen mixture distribution. Adjusting the hydrogen injection strategy can optimize the engine's combustion and emission performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
Energy & Fuels
Sangjae Park, Ji Yong Shin, Choongsik Bae, Jinyoung Jung, Juhun Lee
Summary: This research investigated particle emissions from a modern turbocharged gasoline direct injection engine through combustion analysis and simultaneous flame visualization. The study found that boosting changed the influence of heterogeneity and flow interaction by sprays, resulting in differences in heat release from combustion and particle generation. Through optimization of injection strategies, combustion phenomena can be controlled to reduce particle emissions in moderate boosted conditions. The results of combustion analysis affecting particle generation can provide clues to reduce particle emissions from T-GDI engines.
Article
Thermodynamics
Sanguk Lee, Gyeonggon Kim, Choongsik Bae
Summary: Hydrogen direct injection using stratified charge combustion (SCC) was studied to extend the lean limit of spark ignition engines. Varying the injection and ignition timing showed different types of combustion and combustion stability. The optimization of hydrogen SCC based on timing could contribute to a clean and efficient transport sector.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Avinash Kumar Agarwal, Vishnu Singh Solanki
Summary: Researchers have successfully controlled NOx and PM emissions and increased engine efficiency by using low-octane gasoline as fuel in compression ignition (CI) engines and adopting strategies to control emissions. In this study, the effects of main injection timing, split injection quantities, and engine load on the performance, combustion, emissions, and particulates of a two-cylinder Gasoline Compression Ignition (GCI) engine were evaluated. The results showed that the GCI mode had a 5% higher brake thermal efficiency and comparable exhaust gas temperature compared to the baseline CDC mode, with improved in-cylinder pressure and lower NOx and PM emissions.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Changwei Ji, Ke Chang, Shuofeng Wang, Jinxin Yang, Du Wang, Hao Meng, Huaiyu Wang
Summary: The study found that injection positions near the top dead center and increasing injection angles can change the rich zone of fuel and local equivalence ratio, with upper injection positions concentrating fuel near the spark plugs for better combustion and higher peak pressure.
Article
Thermodynamics
Samuel J. Kazmouz, Daniel C. Haworth, Peter Lillo, Volker Sick
Summary: The extension to the dynamic thickened flame model allows for modeling of highly stratified combustion and accounts for spatial variations of flow and combustion metrics. The local thermodynamic formulation is used to calculate combustion parameters without relying on information from outside the computational cell. The model extension successfully reproduces in-cylinder flame behavior and burn rate in validation against experimental results.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Eshan Singh, David Vuilleumier, Namho Kim, Magnus Sjoberg
Summary: Mixed-Mode Combustion (MMC) is a method to improve the efficiency of stoichiometric spark-ignition engines by using a lean working fluid and controlled end-gas autoignition. This study investigated the effects of intake conditions and residual gas composition on the autoignition tendency of different fuels, and obtained the applicable conditions and requirements for different fuels.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Chang Ye, Zhe Sun, Mingli Cui, Xuesong Li, David Hung, Min Xu
Summary: This study explores the use of flash boiling atomization technique to improve spray atomization by elevating fuel temperature, combined with high energy ignition technique for better GDI engine performance under lean-burn conditions. Results show that flash boiling atomization extends the lean limit from 1.95 to 2.10, with impacts on key parameters and emissions.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Li Wang, Zhaoming Huang, Wang Tao, Kai Shen, Weiguo Chen
Summary: The study on EGR and excess-air dilution in a GDI turbocharged engine with prechamber showed that excess-air dilution has better fuel economy, while EGR dilution can reduce NOX emissions; prechamber can improve fuel economy, advance combustion phase, but has higher restrictions on HC emissions for excess-air dilution.
ADVANCES IN MECHANICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Cheol Woong Park, Chang Gi Kim, Young Choi, Sun Youp Lee, Sung Won Lee, Ui Hyung Yi, Jang Hee Lee, Tae Min Kim, Duk Sang Kim
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2017)
Article
Thermodynamics
Cheolwoong Park, Stephen Busch
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2018)
Article
Chemistry, Physical
Cheolumong Park, Sunyoup Lee, Changgi Kim, Young Choi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
Article
Chemistry, Physical
Jeongwoo Lee, Cheolwoong Park, Yongrae Kim, Young Choi, Jongwon Bae, Byeungjun Lim
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Energy & Fuels
Cheolwoong Park, Wonah Park, Yongrae Kim, Young Choi, Byeungjun Lim
Article
Chemistry, Physical
Cheolwoong Park, Yongrae Kim, Young Choi, Jeongwoo Lee, Byeungjun Lim
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Jeongwoo Lee, Cheolwoong Park, Jongwon Bae, Yongrae Kim, Young Choi, Byeungjun Lim
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Thermodynamics
Sangho Lee, Ui Hyung Yi, Hyungjoon Jang, Cheolwoong Park, Changgi Kim
Summary: The performance of an engine using biomethane deteriorated in the wide-open throttle test, but it met the EURO-6 emission standards for nitrogen oxide, carbon monoxide, and non-methane hydrocarbons in the world harmonized transient cycle mode. However, methane and ammonia emissions were higher than specified in the EURO-6 standards, and fuel consumption with biomethane was 39.4% higher than with CNG in the WHTC mode.
Article
Chemistry, Physical
Cheolwoong Park, Yongrae Kim, Sechul Oh, Junho Oh, Young Choi
Summary: The study explores the performance and efficiency of a port injection-type hydrogen engine under different operation strategies and engine speeds. It found that adjusting the heat rating and ignition energy of the spark plug can effectively reduce electrode temperature and improve engine performance and stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Sechul Oh, Cheolwoong Park, Ducduy Nguyen, Seonyeob Kim, Yongrae Kim, Young Choi, Jeongwoo Lee
Summary: The study focused on investigating a hydrogen-fueled spark ignition engine for UAV operation, specifically looking at the combustion region and idle condition. Results showed that an excess air ratio between 1.8 and 2.0 with MBT operation was suitable, while extremely lean conditions with an excess air ratio up to 3.0 could almost eliminate nitrogen oxide emissions, even at zero load.
Article
Energy & Fuels
Seonyeob Kim, Cheolwoong Park, Hyungjoon Jang, Changgi Kim, Yongrae Kim
Summary: This study conducted experiments on valve timing variations in a natural gas engine, revealing the impact of changes in intake and exhaust valve timing on engine performance and methane emission.
Article
Energy & Fuels
Cheolwoong Park, Sechul Oh, Changgi Kim, Young Choi
Summary: The study proposes countermeasures to minimize the impact of low calorific gases on the performance and emissions of a natural gas engine by adjusting gas composition and increasing the base fuel amount. Experimental results suggest that adopting different strategies under different operating conditions can maintain stable engine operation.
Article
Chemistry, Physical
Cheolwoong Park, Yongrae Kim, Sechul Oh, Junho Oh, Young Choi, Hongkil Baek, Seung Woo Lee, Kyeonghyeon Lee
Summary: The study utilized components from a gasoline direct-injection engine to implement the in-cylinder hydrogen fuel injection method, adjusting injection timing and pressure to enhance engine output performance and efficiency, resulting in increased torque and reduced NOx emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Sechul Oh, Cheolwoong Park, Junho Oh, Seonyeob Kim, Yongrae Kim, Young Choi, Changgi Kim
Summary: The full load performance and emission characteristics of a natural gas-ammonia dual fuel engine were investigated in this study. Experimental results showed that the existing fuel supply system could not provide the required brake torque, leading to increased instability and unburned fuel. The introduction of ammonia resulted in dominant fuel NOx emissions.
Article
Multidisciplinary Sciences
Changgi Kim, Cheolwoong Park, Yongrae Kim, Young Choi
Summary: By optimizing the boosting device of the hydrogen engine, it is possible to achieve efficient operation of the engine under high boost conditions while reducing nitrogen oxide emissions.
