活塞稳态温度与柴油机运行工况的关系研究

Study on relationship between piston steady-state temperature and operation condition of diesel engine

利用存储式活塞稳态温度测试系统,基于负荷特性曲线,对连续工况下活塞稳态温度进行测量.综合分析测试数据,分别对9个和25个工况点活塞温度用二次多项式进行拟合,计算了中间工况下活塞温度.结果表明:活塞温度分别随转速与扭矩的增加而呈现明显增加趋势;二次多项式拟合方法能有效获得中间工况活塞温度,满足大多数工况下的工程计算精度要求,可用于预测未知工况下的活塞稳态温度.利用该方法可有效获得部分负荷工况下活塞的稳态温度,也可为缸内三维燃烧和排放的活塞侧边界条件的获取提供支持.

To get the piston temperature,by utilizing steady temperature measurement system,piston steady-state temperatures were measured under continuous operation conditions along load characteristic curves.The test data were fitted by quadratic polynomials with nine and twenty-five different operating points respectively.Piston temperatures of some other operation conditions were calculated also.The results show that the piston temperatures rise as the increasing of rotational speed and torque respectively.The quadratic polynomial fitting method is effective for obtaining the piston temperature of middle operation conditions.This study provides a method to get piston temperatures under partial duty conditions,which is useful for the simulation of combustion and emission.