Effect of Parameters of Compressed Air System on
Performances for the Engine

ZUO Chengji¹  WANG Bin¹  FU Qiuyang¹  OUYANG Minggao²  YANG Fuyuan²

(1. School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009;
2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084)

Abstract: Instantaneous state analysis method is used to set up a mathematic model for compressed air engine, and fluid flow software Flowmaster flow software is used for research on the effect of parameters of compressed air system on performances for the engine. Through simulation, approach and method are brought out for increasing compressed air engine power performance and meliorate its economy performance. Research results indicate the following the pressure in the cylinder are increased by shortening up or down stream pipe length before or behind the inlet valve, and expanding upstream pipe diameter; The relation between downstream pipe diameter and charge quality is based on the Mach number in the downstream pipe of inlet valve; Indicative power is increased by expending exhaust valve diameter and adopting appropriate intake advance angle; Enhancing the pressure in the cylinder, improving the efficiency of intake air, increasing the indicative power are beneficial to improve power and economy performances for the compressed air engine.

Key words: Compressed air engine  Performance  Flowmaster flow software

CLC No: U27

清华大学汽车安全与节能国家重点实验室开放基金资助项目(KF2005-005). Received 20070408, received in revised form 20070920

References

[1] CHEN Ying, XU Hong, TAO Guoliang. Research and progress of the compressed air power vehicle [J]. Chinese Journal of Mechanical Engineering, 2002, 38(11): 7-11.
[2] XU Hong. Compressed air driven vehicle [J]. Automobile Technology, 2002(7): 5-7.
[3] XU Hong. The feasibility research of compressed-air powered vehicle [J]. China Mechanical Engineering, 2002, 13(17): 1 512-1 515.
[4] JIA Guangzheng, WANG Xuanyin, WU Genmao. Viewing on applications and developments of the compressed air power [J]. China Mechanical Engineering, 2004, 17(15): 1 190-1 194.
[5] KNOWLEN C, WILLIAMS J, MATTICK A T, et al. Quasi-isothermal expansion engines for liquid nitrogen automotive propulsion[G]. SAE Paper 972649, 1997.
[6] KNOWLEN C, MATTICK A T, BRUCKNER A P, et al. High efficiency energy conversion systems for liquid nitrogen automobile[G]. SAE Paper 981898, 1998.
[7] LIU Hao, CHEN Ying, TAO Guoliang. A study on the valve train system of compressed air powered engine [J]. China Mechanical Engineering, 2004, 15(18): 1 668-1 671.
[8] YU Xiaoli, YUAN Guangjie, SHEN Yuming, et al. Theoretical analysis of air powered engine work cycle [J]. Chinese Journal of Mechanical Engineering, 2002, 38(9): 118-122.
[9] JIA Guangzheng, WANG Xuanyin, CHEN Ying, et al. Study on energy system of compressed air powered car [J]. Joumal of Zhejiang University(Engineering Science), 2003, 37(11): 715-718.
[10] AN Da, TAN Jian, ZUO Chengji. Designing and experiment of a compressed-air engine [J]. Journal of Hefei University of Technology, 2005, 38(9): 118-122.
[11] ZUO Chengji, QIAN Yejian, AN Da, et al. Experimental study on air-powered engine[J]. Chinese Journal of Mechanical Engineering, 2007, 43(4): 93-97.
[12] ZUO Chengji, QIAN Yejian, OUYANG Minggao, et al. Analysis on energy transfer system in air-powered engine[J]. China Mechanical Engineering, 2007, 18(7): 870-873.