对置活塞二冲程柴油机换气子阶段完成比例研究

doi:10.3969/j.issn.1000-1093.2018.03.002

兵工学报 ›› 2018, Vol. 39 ›› Issue (3): 428-435.doi: 10.3969/j.issn.1000-1093.2018.03.002

对置活塞二冲程柴油机换气子阶段完成比例研究

刘宇航¹，张付军¹，慕连好²，高宏力¹，王苏飞¹

（1.北京理工大学机械与车辆学院，北京 100081; 2.火箭军驻济南地区军事代表室，山东济南 250000）

收稿日期:2017-11-10 修回日期:2017-11-10 上线日期:2018-05-07
通讯作者: 张付军（1966—），男，教授，博士生导师 E-mail:zfj123@bit.edu.com
作者简介:刘宇航（1989—），男，博士研究生。E-mail：yuelengfanhua111@163.com
基金资助:
国家部委基础研究项目（B2220110005）；深圳市科技创新基金项目（JCYJ20170817114345260）

Research on Completion Ratios of Scavenging in Scavenging Sub-phases of Opposed-piston Two-stroke Diesel Engine

LIU Yu-hang¹, ZHANG Fu-jun¹, MU Lian-hao², GAO Hong-li¹, WANG Su-fei¹

（1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2.Military Representative Office in Jinan Region of Rocket Force, Jinan 250000, Shandong, China）

Received:2017-11-10 Revised:2017-11-10 Online:2018-05-07

摘要/Abstract

摘要： 针对对置活塞二冲程柴油机自由排气、扫气和后充气3个换气子阶段，开展不同换气子阶段对换气过程影响研究，了解不同换气子阶段在整个换气过程中的完成比例。以某对置活塞二冲程柴油机为研究对象，在建立一维仿真模型并验证其准确性的基础上，通过缸内二氧化碳质量的变化研究了该柴油机3个换气阶段在整个换气过程中的完成比例。通过改变转速、压差和排气背压研究了这3种影响因素对不同换气阶段的影响。结果表明：该柴油机在发动机转速1 200 r/min、压差0.013 MPa、背压0.18 MPa时，自由排气、扫气和后充气3个阶段在换气过程中的完成比例分别为64.42%、35.57%和0.01%；自由排气完成比例随着转速的增加而逐渐下降，扫气阶段完成比例逐渐增加；进排气压差的影响效果与转速相似；排气背压的改变对不同换气阶段完成比例的影响不明显，只对换气过程中缸内二氧化碳的质量变化影响较大。

关键词: 柴油机, 对置活塞二冲程, 换气过程, 一维仿真

Abstract: The influences of the free exhaust, discharge and additional scavenging phases of opposed-piston two-stroke (OP2S) diesel engine on the scavenging process are studied. To understand the completion of different scavenging phases in the whole scavenging process is very significant in investigating the OP2S's scavenging process and the influences of scavenging parameters on scavenging process. A 1-D simulation model is established for an OP2S diesel engine, and the accuracy of the proposed model is validated. The completed proportions of different scavenging phases in whole scavenging process are studied from the quality change of carbon dioxide in cylinder. The results illustrate that the completed proportions of free exhaust, discharge and additional scavenging phases are 64.42%, 35.57% and 0.01%, respectively, under the simulation conditions of 1200 r/min, 0.013 MPa pressure difference and 0.18 MPa back exhaust pressure. If the engine speed increases, the free exhaust period decreases and the discharge period increases. The influencing effect of scavenging difference is similar with that of engine speed. The influence of exhaust pressure on the completed proportions of different scavenging periods is not significant but the carbon dioxide mass in cylinder varies significantly when exhaust pressure changes. Key

Key words: dieselengine, opposed-pistontwo-stroke, scavengingprocess, 1-Dsimulation

中图分类号:

TK421⁺.3

刘宇航，张付军，慕连好，高宏力，王苏飞. 对置活塞二冲程柴油机换气子阶段完成比例研究[J]. 兵工学报, 2018, 39(3): 428-435.

LIU Yu-hang, ZHANG Fu-jun, MU Lian-hao, GAO Hong-li, WANG Su-fei. Research on Completion Ratios of Scavenging in Scavenging Sub-phases of Opposed-piston Two-stroke Diesel Engine[J]. Acta Armamentarii, 2018, 39(3): 428-435.

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对置活塞二冲程柴油机换气子阶段完成比例研究

Research on Completion Ratios of Scavenging in Scavenging Sub-phases of Opposed-piston Two-stroke Diesel Engine

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