Combustion simulation and key parameter optimization for opposite axial piston engine in small-scale
来源期刊：中南大学学报(英文版)2015年第9期
论文作者：ZHANG Lei XU Hai-jun PAN Cun-yun XU Xiao-jun
文章页码：3397 - 3408
Key words：opposite axial piston engine; quasi-dimension model; computational fluid dynamics (CFD); optimal design
Abstract: As potential alternative power sources used in portable electric generators, opposite axial piston engines in small-scale were investigated to show their advantages in power density. A novel cylinder charge system was introduced, based on which a quasi-dimension model and a CFD (computational fluid dynamics) model were established. Comparison of those two models was carried out to validate the quasi-dimension model. Furthermore, optimal diameter of charge cylinder and speed were determined after evaluating the quasi-dimension model based on different parameters. High agreement between the quasi-dimension model and the CFD model validates the quasi-dimension model. Further studies show that the power of engine increases with the diameter of charge cylinder. However, a too big charge cylinder lowers the fuel efficiency instead. Taking economic influence into consideration the charge cylinder should be 1.4 times power cylinder, which could ensure the power density, volumetric efficiency and fuel economic at the same time. Axial piston engine running at 1.0×104 r/min could achieve a better overall performance. The maximal power of engine with optimal parameters is 0.82 kW, which fits the power need of the portable electric generators completely.
ZHANG Lei(张雷), XU Hai-jun(徐海军), PAN Cun-yun(潘存云), XU Xiao-jun(徐小军)
(College of Mechatronics Engineering and Automation,
National University of Defense Technology, Changsha 410073, China)
Abstract:As potential alternative power sources used in portable electric generators, opposite axial piston engines in small-scale were investigated to show their advantages in power density. A novel cylinder charge system was introduced, based on which a quasi-dimension model and a CFD (computational fluid dynamics) model were established. Comparison of those two models was carried out to validate the quasi-dimension model. Furthermore, optimal diameter of charge cylinder and speed were determined after evaluating the quasi-dimension model based on different parameters. High agreement between the quasi-dimension model and the CFD model validates the quasi-dimension model. Further studies show that the power of engine increases with the diameter of charge cylinder. However, a too big charge cylinder lowers the fuel efficiency instead. Taking economic influence into consideration the charge cylinder should be 1.4 times power cylinder, which could ensure the power density, volumetric efficiency and fuel economic at the same time. Axial piston engine running at 1.0×104 r/min could achieve a better overall performance. The maximal power of engine with optimal parameters is 0.82 kW, which fits the power need of the portable electric generators completely.
Key words:opposite axial piston engine; quasi-dimension model; computational fluid dynamics (CFD); optimal design
