Journal of Shanghai Jiaotong University ›› 2020, Vol. 54 ›› Issue (8): 856-865.doi: 10.16183/j.cnki.jsjtu.2019.066

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Simulation Study of Effect of Ejection Ratio on Combustion of a Stirling Engine Fueled with Biodiesel

WANG Lintao1,2, SUN Chunhua1(), LIN Zhimin2, YU Xiangyu2, QIAO Xinqi1, YUAN Xiong1, WANG Jigang1   

  1. 1. Institute of Internal Combustion Engine, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China
  • Received:2019-03-13 Online:2020-08-28 Published:2020-08-18
  • Contact: SUN Chunhua


A skeleton reaction mechanism of biodiesel was constructed by using the decoupling method, and a numerical calculation model of spray and combustion for a Stirling engine was established. The combustion characteristics of the Stirling engine fueled with biodiesel and petro-diesel respectively were compared, and the influence of ejection ratio on the temperature, speed, and composition field of biodiesel was also given. The results show that the simplified mechanism of biodiesel, Bio-37, can effectively reduce the reaction step to less than 100 under the premise of a better prediction of the high temperature ignition characteristics. Compared with petro-diesel, the oxygen characteristic of biodiesel is fully developed in the Stirlirg engine, when fueled with biodiesel. The flow fields of combustion temperatures and velocity are more uniform, the temperature of the flame baffle is lower, and the safety of the equipment is improved. With the increase in ejection ratio, the maximum temperature in the combustion chamber can be reduced, while the uniformity of temperature distribution can be improved, the temperature and flow intensity near the heat exchanger can be increased, and the thermal efficiency can be improved owning to the enhancement of heat and mass transfer. An increase in ejection ratio can also reduce the heat load of flame baffle and improve the reliability of Stirling engine.

Key words: biodiesel, ejection, Stirling engine, numerical simulation

CLC Number: