涡轮增压器进/排气蜗壳结构优化与性能分析

为了分析涡轮增压器涡轮部件进/排气蜗壳对涡轮级性能的影响及相互作用机理,提高涡轮效率,采用数值模拟的方法对涡轮增压器中的进/排气蜗壳进行优化设计,提出进气蜗壳和排气蜗壳的优化方案,并与涡轮整机联合运算,对比分析涡轮整机的性能。结果表明:进气蜗壳主要对静叶10%叶高的来流攻角产生影响,优化方案可为涡轮提供更好的进口条件,排气蜗壳主要对动叶尾缘的载荷分布产生影响,优化方案可以增加涡轮的做功能力,进/排气蜗壳的优化设计可使整机总静效率提高1.19%。

Structural Optimization and Performance Analysis of Intake and Exhaust Volutes of a Turbocharger

In order to analyze the influence of inlet/exhaust volutes of turbocharger turbine component on turbine stage performance and the interaction mechanism, and improve turbine efficiency, numerical simulation was used to optimize the design of the intake/exhaust casing in the turbocharger. The optimization scheme of the intake volute and the exhaust volute was proposed, and the calculation was combined with the entire turbine to compare and analyze the performance of the entire turbine. The results show that the intake volute mainly affects the inlet angle of attack of the stator with 10% blade height, and the optimization scheme can provide better inlet conditions for the turbine. The exhaust volute mainly affects the load distribution of the trailing edge of the rotor. The optimization scheme can increase the working ability of the turbine, so the optimization design of the intake/exhaust volute can improve the total static efficiency of the whole machine by 1.19%.