车用天然气发动机活塞稳态温度存储法测量  

Steady-state piston temperature measurement by storage method in natural gas engine

作　　者：黄荣华[1] 李桂全[1] 代辉[1] 贾李水 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]东风商用车技术中心,湖北武汉430056

出　　处：《华中科技大学学报（自然科学版）》2015年第9期128-132,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50976039)

摘　　要：设计、制作了一套活塞稳态温度存储测试系统.实验前对该装置进行了高温可靠性试验,并对各测量通道进行了误差标定,发现各通道平均测量误差不超过0.07mV,再综合热电偶和铂电阻的随机误差,系统测温误差小于5℃.利用该系统测量了一台车用大功率压缩天然气发动机沿外特性曲线上1 100,1 200,1 300,1 500,1 700和1 900r/min这6个工况点的活塞稳态温度.测量结果表明:该系统可在高温、高负载下可靠、稳定地工作;该发动机活塞上的几个测点中,火力岸温度最高,在1 200r/min下达到284℃,在此温度下,该活塞满足该型发动机的可靠性要求.A method of storage piston temperature measurement w as developed to measure the steady‐state piston temperature in a working engine .High‐temperature reliability test was done before actual measurement ,w hich indicates that the average measurement errors for each test channel are no more than 0 .07 mV by the error calibration ,and the accuracy of the system is 5 ℃ besides the random error of thermocouple and platinum .The piston temperatures were measured on a high‐power compressed natural gas （CNG） engine at six engine speeds ,namely 1 100 ,1 200 ,1 300 ,1 500 ,1 700 ,and 1 900 r/min .T he results indicate that the device can w ork properly at high temperature and heavy‐duty con‐ditions ,and the top land has the highest temperature ,which reaches 284 ℃ at 1 200 r/min .The pis‐ton can satisfy the reliability requirements of the engine at this temperature .

关 键 词：天然气发动机 活塞 稳态温度 温度触发 火力岸 存储法 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]