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为了降低柴油机气缸盖的热负荷,以重载柴油机气缸盖为研究对象,进行了缸盖底部温度测量实验,并建立了发动机一维工作过程计算与缸盖内三维流动、传热与应力的多场耦合仿真模型,在此基础上提出了优化鼻梁区冷却通道尺寸并削薄缸盖底板的优化设计措施.结果表明:改进措施使该气缸盖的最高工作温度由336.3℃降低为325.7℃,最大热机耦合应力由498 MPa降低为491 MPa,有效降低了气缸盖的热负荷.
In order to reduce the thermal load on the cylinder head of a diesel engine, the cylinder head of a heavy-duty diesel engine is taken as the research object, and the temperature measurement experiment of the cylinder head is carried out. The calculation of the one-dimensional working process of the engine and the three-dimensional flow, heat transfer and stress in the cylinder head are established Field coupling simulation model, and on this basis, the optimization design measures of optimizing the size of the cooling channel in the nose bridge area and thinning the bottom of the cylinder head are proposed.The results show that the improvement measures can reduce the maximum working temperature of the cylinder head from 336.3 ℃ to 325.7 ℃, the maximum Thermal coupling stress reduced from 498 MPa to 491 MPa, effectively reducing the thermal load on the cylinder head.