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涡轮增压柴油机排气阀的热应力是限制柴油机强化度的因素之一。在建造新柴油机和新柴油机跑合调试时,为了缩短制造时间和减少试验工作,广泛采用了有关零件热状态数学模型计算方法。因为燃气传向气阀的大约70%的热,在接触时因热交换传到气缸盖,所以气阀的热状态颇大程度上取决于这种气阀阀面与气缸盖阀座之间的接触换热条件。由于接触换热周期特性不稳定,因此现有的换热关系式对柴油机中所述热交换计算不适
Turbocharged Diesel exhaust valve thermal stress is one of the factors that limit the degree of diesel engine reinforcement. In the construction of new diesel engine and the new diesel engine running the commissioning, in order to shorten the manufacturing time and reduce the test work, widely used in parts thermal state mathematical model calculation method. Because about 70% of the heat delivered to the valve by the gas is transmitted to the cylinder head by heat exchange during contact, the thermal state of the valve depends largely on the pressure between the valve face of the valve and the valve seat of the cylinder head Contact heat transfer conditions. Due to the unstable nature of the contact heat exchange cycle, the existing heat exchange relation is not suitable for the heat exchange calculation in the diesel engine