Effect of equivalence ratio on diesel direct injection spark ignition combustion
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Effect of equivalence ratio on diesel direct injection spark ignition combustion CHEN Zheng(陈征)1, 2, QIN Tao(覃涛)1, 2, HE Ting-pu(何廷谱)1, 2, ZHU Li-jing(朱立靖)1, 2 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China; 2. Research Center for Advanced Powertrain Technology, Department of Energy and Power Engineering, Hunan University, Changsha 410082, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Aviation heavy-fuel spark ignition (SI) piston engines have been paid more and more attention in the area of small aviation. Aviation heavy-fuel refers to aviation kerosene or light diesel fuel, which is safer to use and store compared to gasoline fuel. And diesel fuel is more suitable for small aviation application on land. In this study, numerical simulation was performed to evaluate the possibility of switching from gasoline direct injection spark ignition (DISI) to diesel DISI combustion. Diesel was injected into the cylinder by original DI system and ignited by spark. In the simulation, computational models were calibrated by test data from a DI engine. Based on the calibrated models, furthermore, the behavior of diesel DISI combustion was investigated. The results indicate that diesel DISI combustion is slower compared to gasoline, and the knock tendency of diesel in SI combustion is higher. For a diesel/air mixture with an equivalence ratio of 0.6 to 1.4, higher combustion pressure and faster burning rate occur when the equivalence ratios are 1.2 and 1.0, but the latter has a higher possibility of knock. In summary, the SI combustion of diesel fuel with a rich mixture can achieve better combustion performance in the engine. Key words: diesel; direct injection; spark ignition; equivalence ratio; combustion; knock Cite this article as: CHEN Zheng, QIN Tao, HE Ting-pu, ZHU Li-jing. Effect of equivalence ratio on diesel direct injection spark ignition combustion [J]. Journal of Central South University, 2020, 27(8): 2338−2352. DOI: https://doi.org/10.1007/s11771-020-4453-4.
1 Introduction Aviation piston engines have some unique advantages such as smaller volume, lower weight, simpler structure, and more convenient maintenance, which are very obvious in low power range compared to turbojets, turboshafts, turboprops, turbofans, jets and other types of engine, so they have been widely used in the area of small
aero-engines with power less than 100 kW. The aviation piston engines usually use aviation gasoline as fuel by means of spark ignition (SI) combustion, but gasoline vapor, which is easy to ignite or even cause explosion, has poor safety. In recent years, heavy-fuel as the fuel of aviation piston engines is being paid more attention and studied [1]. In the area of aviation, heavy-fuel mainly refers to aviation kerosene or light diesel fuel, which has higher flash point and lower
Foundation item: Project(2018JJ2041) supported by the Science and Technology Project in Hunan Province, China; Pro
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