液压自由活塞柴油机的做功影响因素分析

doi:10.3969/j.issn.1000-1093.2016.03.002

兵工学报 ›› 2016, Vol. 37 ›› Issue (3): 394-399.doi: 10.3969/j.issn.1000-1093.2016.03.002

液压自由活塞柴油机的做功影响因素分析

张栓录¹，赵长禄¹，钟科²，赵振峰¹

（1.北京理工大学机械与车辆学院，北京 100081; 2.重庆铁马工业集团有限公司，重庆 400050）

收稿日期:2015-06-19 修回日期:2015-06-19 上线日期:2016-05-24
作者简介:张栓录(1988—)，男，博士研究生
基金资助:
国家部委基础研究项目（62201070215）

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

ZHANG Shuan-lu¹， ZHAO Chang-lu¹， ZHONG Ke², ZHAO Zhen-feng¹

（1.School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China;2.Chongqing Tiema Industries Group Co.Ltd, Chongqing 400050, China）

Received:2015-06-19 Revised:2015-06-19 Online:2016-05-24

摘要/Abstract

摘要： 在研制的二冲程单活塞式液压自由活塞柴油机（HFPDE）原理样机试验平台上，通过对发动机压缩膨胀过程中活塞的受力情况的分析，得出了影响HFPDE指示功大小的主要因素为燃油预喷油量、燃油开始喷射时活塞的位置以及排气门开启时刻。为分析这些影响因素对HFPDE做功的影响规律，研究了不同喷油时刻及预喷油量对循环指示功的影响，发现燃油开始喷射时刻对HFPDE的指示功影响主要来源于压缩过程中活塞速度的波动。在工作压力为25 MPa工况下，预喷油量对循环指示功的影响主要表现为上止点的变化。展开不同排气门开启位置对HFPDE做功的影响规律研究，研究结果发现：排气门开启时刻越早，对应的平均指示压力越低，最终降低了发动机的热效率。

关键词: 动力机械工程, 受力分析, 自由活塞柴油机, 指示功, 指示热效率

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

中图分类号:

TK441

张栓录，赵长禄，钟科，赵振峰. 液压自由活塞柴油机的做功影响因素分析[J]. 兵工学报, 2016, 37(3): 394-399.

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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液压自由活塞柴油机的做功影响因素分析

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

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