涡轮增压器动态特性测试用脉冲发生器设计

Design of Pulse Generator Based on Turbocharger Dynamic Characteristics Measurement

为了准确模拟增压发动机实际排气压力波状况,进行涡轮增压器动态特性测试,分析了发动机排气压力波特征,确定了脉冲发生器设计目标。在前期研究的基础上,对脉冲发生器转动盘开口型线提出了改进方案,利用一维非稳态仿真计算和三维CFD计算相结合的方法,对脉冲发生器进行了设计,模拟发动机不同频率和不同进气相位的排气压力波。利用试验对脉冲发生器产生的压力波进行了验证,结果表明,设计的脉冲发生器可以准确地模拟出典型的发动机排气压力波,证明了设计计算方法的可行性和改型方案的正确性,为脉冲发生器提供了一种比较完善的设计体系。

In order to accurately simulate the actual turbocharged engine exhaust pressure wave conditions for turbocharger dynamic characteristics measurement,the characteristic of engine exhaust pressure wave and the goal of pulse generator design were analyzed.A pulse generator rotating disc profile optimization was put forward on the basis of former research.The pulse generator used to simulate ICE to produce pressure wave was designed by using 1-D simulation and 3-D CFD.Experiment was carried out on the proposed generator.The experiment result showed that the pressure wave produced by pulse generator was similar to that of ICE,which proved the feasibility and validation of the optimization and the calculation method.A comparatively perfect design system of pulse generator was put forward.