天然气发动机气缸盖冷热冲击试验方法研究  

Research on cold and thermal shock test of natural gas engine cylinder head

作　　者：李徐东 吴宇波 李朝阳 LI Xudong;WU Yubo;LI Chaoyang(Shanghai New Power Automotive Technology Co.,Ltd.,Shanghai 200438,China)

机构地区：[1]上海新动力汽车科技股份有限公司,上海200438

出　　处：《柴油机设计与制造》2022年第3期44-49,共6页Design and Manufacture of Diesel Engine

摘　　要：为了探究冷热冲击试验对天然气发动机气缸盖耐久测试的合理性,通过在某型号天然气发动机气缸盖上加装热电偶传感器,研究冷却水出口温度和转速对气缸盖温度的影响。结果表明:发动机稳定在额定点工况下,火花塞孔附近温度最高,排气门桥间温度最低,其中冷却水出口温度与气缸盖温度呈正相关;在标准冷热冲击试验工况下,气缸盖最大温差在100~150 K,取消标准冷热冲击试验工况的怠速和停机工况后,冷冲击阶段冷却水温度设置为30℃时,发动机高怠速工况时气缸盖最大温差在100~150 K,而低怠速工况时气缸盖最大温差在180~220 K,此时的温差对于天然气发动机气缸盖的影响较大。In order to explore the rationality of cold and thermal shock test on the durability assessment of natural gas engine cylinder head, the influence of different cooling water outlet temperature and speed on cylinder head temperature was studied by installing thermocouple sensors on the cylinder head of a natural gas engine. Results show that under rated condition, the temperature near the spark plug hole is the highest, which is the lowest between the exhaust valve, and the temperature of the cooling water is positively correlated with the temperature of the cylinder head. Under cold and thermal shock conditions, the maximum temperature difference of cylinder head is 100-150 K. After cancelling the idle and shutdown conditions of standard cold and thermal shock conditions, when the cooling water outlet temperature is set at 30 ℃ in cold shock stage, the maximum temperature difference of cylinder head is 100-150 K when the engine is running at high idle condition. However, the maximum temperature difference of the cylinder head at low idle condition is between 180-220 K, which has a great impact on the cylinder head of the natural gas engine.

关 键 词：天然气发动机 冷热冲击试验 气缸盖 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]