天然气发动机活塞稳态温度存储式测量系统

Steady-state Temperature Measurement on the CNG Engine Piston

设计了一套存储式活塞稳态温度测量装置,系统测试精度为±1℃;对EQD180N-20型天然气发动机外特性1 000、1 500、2 100 r/min 3个转速点进行了活塞稳定工况温度测量,同时进行了发动机转速从1 000 r/min缓慢上升到2 100 r/min的活塞温升试验。表明系统工作稳定可靠,提高了活塞温度测量效率,分析了EQD180N-20型发动机活塞温度热负荷,活塞轴向的平均温度梯度达23℃/min。

A set of steady temperature measurement device was developed.A high accuracy of ±1℃ could be obtained by the system as long as the error was calibrated.The piston temperature was measured at the engine speeds of 1 000 r/min,1 500 r/min and 2 100 r/min on the external characteristics of the engine of EQD180N-20,respectively.The piston temperature variation test was performed from 1 000 r/min to 2 100 r/min simultaneously.The results show that the proposed system is stable and reliable.On the external characteristics,the temperature of each feature point increased firstly and then declined slightly as the engine speed increased,and a maximum value was observed at 1 500 r/min;on the stable working condition,the highest temperature appeared in the piston top surface with a value of 264℃,The first piston ring slot temperature is about 215℃.