Analysis of Indicated Work Effect Factors of Hydraulic Free-piston Diesel Engine

doi:10.3969/j.issn.1000-1093.2016.03.002

Abstract

Abstract: The force applied on piston during the compression and expansion stroke is analyzed based on the experimental bench of a two-stroke single-piston hydraulic free-piston diesel engine (HFPDE) prototype. The main factors of affecting the indicated work of HFPDE are obtained, such as fuel-injection quantity, piston position at the beginning of fuel injection, and opening moment of exhausts valve. In order to analyze the effects of the factors on the indicated work of HFPDE, the effects of different fuel injection moments and fuel-injection quantity on cyclic indicated work are analyzed. It turned out that the effect of starting moment of fuel injection on the indicated work derives from the fluctuation in piston velocity during compression stroke. The effect of fuel-injection quantity on the indicated work behaves as the fluctuation of top dead center at the working pressure of 25 MPa. The effects of different opening moments of exhaust valve on the indicated work of HFPDE are analyzed. It is found that the earlier opening of exhaust valve leads to lower mean indicated effective pressure, resulting in the reduction in thermal efficiency.

Key words: power machinery engineering, force analysis, free-piston diesel engine, indicated work, indicated thermal efficiency

CLC Number:

TK441

ZHANG Shuan-lu， ZHAO Chang-lu， ZHONG Ke, ZHAO Zhen-feng. Analysis of Indicated Work Effect Factors of Hydraulic Free-piston Diesel Engine[J]. Acta Armamentarii, 2016, 37(3): 394-399.

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