传热对增压器径流涡轮叶片温度分布的影响

采用共轭传热计算方法,对某柴油发动机废气涡轮增压器径流涡轮流场进行了数值模拟,对比了叶轮在绝热和传热条件下温度分布的差别,研究了传热边界对叶轮温度分布的影响。结果表明,绝热条件下,叶片两侧的温度存在显著的温差,并且从叶轮进口到出口也有明显的温降;而传热条件下,相同叶高下的叶片表面温度分布近乎于一条直线,压力面和吸力面的温度几乎相同;在热平衡条件下,叶轮实体内的温度范围很小,不超过10 K,温度梯度较小表明由温差引起的热应力很小。

Influence of Heat Transfer on Temperature Distribution of Turbine Impeller

Numerical simulation on the radial turbine of a diesel engine's exhaust gas turbocharger was carried out to compare the differences under different boundary conditions and study the influence of fluid-solid heat transfer on blade temperature distribution based on conjugate heat transfer(CHT) method.The results show that,the temperature of the blade differs significantly on both sides under adiabatic condition,and there is a significant temperature drop from leading edge to trailing edge.Under heat conducting boundary condition,the blade temperature distribution is relatively even and the range is small not exceeding 10 K,which means thermal stress caused by the temperature difference is small.