柴油机活塞顶面热状态变化规律试验研究
Experimental Research on Thermal State Change of Diesel Engine Piston Top Surface
作者：文均(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500;成都银河动力有限公司, 四川 成都 610505)；雷基林(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500)；于跃(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500)；王东方(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500)；邓晰文(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500)；李浙昆(昆明理工大学 云南省内燃机重点实验室, 云南 昆明 650500)
Author：WEN Jun(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China;Chengdu Galaxy Power Co. Ltd.,Chengdu 610505, China)；LEI Jilin(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China)；YU Yue(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China)；WANG Dongfang(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China)；DENG Xiwen(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China)；LI Zhekun(Yunnan Province Key Lab. of Internal Combustion Engines, Kunming Univ. of Sci. and Technol., Kunming 650500,China)
收稿日期：2018-12-25 年卷（期）页码：2019,51(4):171-175
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：柴油机;活塞;热状态;过渡工况;瞬态温度场
Key words：diesel engine;piston;thermal state;transient condition;transient temperature field
基金项目：国家自然科学基金项目（51665021；51366006）
中文摘要
为了探究活塞顶面热状态变化规律，以某型增压中冷柴油机为试验对象，采用薄膜热电偶测温法和引线式传输系统对发动机过渡工况下活塞顶面测点瞬态温度场变化规律进行了试验测试研究，并对试验数据计算得到标定功率工况点和最大转矩工况点活塞顶面不同位置测点温度值。研究结果表明：在过渡工况下活塞温度场发生剧烈变化，其中冷启动过程活塞温度变化幅度最大，达到180 ℃；其次是急加速过程活塞温度变化幅度达到140 ℃。急减速工况下活塞各测点温度先迅速升高，约20 s时达到最大值，4个测点A、B、C、D分别为346、341、314、343 ℃，然后温度缓慢降低，约60 s后趋于稳定。在标定功率工况点，活塞顶面最高稳定温度为331 ℃，顶面各测点温差31 ℃；在最大转矩工况点，活塞顶面最高稳定温度为336 ℃，顶面各测点温差29 ℃。
英文摘要
In order to explore the change rule of piston thermal state, a turbocharged intercooled diesel engine was treated as the research object. The temperature at designated point at the top surface of piston was measured by thin film thermocouple temperature measurement method and lead transmission system under transient operating process and the temperature values at different locations of the piston top surface at the calibrated power operating point and the maximum torque operating point are obtained by calculating the test data. The research results show that the temperature field of the piston changes dramatically during transient condition of the engine. The temperature of each measuring point at the top surface of piston rises sharply during the early stage of the cold start and rapid acceleration situations. The piston temperature variation is the largest up to 180 ℃ during the cold start process, and then its up to 140 ℃ during the rapid acceleration process. At the early stage of the rapid deceleration, the temperature of each measuring point of the piston rises rapidly, reaches the maximum at about 20 s. The maximum temperature of the four measuring points is 346,341,314,343 ℃ respectively, and then slowly decreases to a stable value. At the rated power point, the maximum stable temperature of the top surface of the piston is 331 ℃, and the temperature difference of the top surface is 31 ℃. At the maximum torque operating point, the maximum stable temperature of the piston top is 336 ℃, and the temperature difference of the top surface is 29 ℃.
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