气缸盖排气鼻梁区优化设计

Optimization Design of the Exhaust Bridge Zone of Cylinder Head

针对气缸盖排气鼻梁区热负荷承载较高的问题,对排气鼻梁区冷却流场优化设计,有效降低了排气鼻梁区边缘热负荷。依据塑性应变能理论,对排气鼻梁区进行低周疲劳寿命预测,优化后的排气鼻梁区火力面低周疲劳寿命较原方案提高了38%。经过排气道稳流试验证明,优化设计后的排气鼻梁区使得排气道平均流量系数提高了3.56%。

In orde to solve the problem of high thermal load bearing in the exhaust bridge zone of the cylinder head,the optimization design of the cooling flow field of the exhaust bridge zone has effectively reduced the thermal load on the edge of the exhaust bridge zone.According to the plastic strain energy theory,the low cycle fatigue life of the exhaust bridge zone is predicted,the low cycle fatigue life of the firing region in the exhaust bridge zone is 38% higher than that of the original scheme.Through the steady flow test of the exhaust port,it is proved that the optimized exhaust bridge zone increases the average flow coefficient of the exhaust port by 3.56%.