增压器压气机叶片结构/振动一体化优化设计

Integrated Structure and Vibration Optimization Design of Turbocharger Compressor Blade

以废气涡轮增压器压气机叶轮为研究对象,创建了压气机叶片的三维参数化模型,通过全三维流场仿真分析,得到压气机的气动性能及叶片表面的压力分布。在不改变叶片形状、保证压气机气动性能的情况下,对叶片的静强度及振动特性进行了一体化优化设计。以叶片4个关键截面的叶顶、叶根厚度为设计变量,以离心力及气动压力作用下叶片的最大Mises应力、叶片的一阶动频为约束,以叶片体积为目标函数,在iSIGHT优化平台上集成了I-DEAS、ANSYS软件,采用混合整型优化和自适应模拟退火算法的组合优化方法,在满足叶片静强度小于屈服强度和一阶动频大于3倍工作频率的条件下,叶片体积(质量)减小了14.7%。

The optimization of turbocharger compressor blade was presented,a three dimensional model of compressor blade was established,and the aerodynamic performance and compressor blade surface pressure distribution were obtained through the three-dimensional flow field numerical simulation.With not changing the blade shape to ensure the compressor aerodynamic performance,the integrated optimization of the blade static strength and vibration characteristics was carried out.The roof and root thickness of the four key cross-sections of the blade were used as design variables,the Von Mises stress under the centrifugal force and aerodynamic pressure and the first order dynamic frequency were used as constraints,and the volume of the blade was used as the objective function.In iSIGHT optimization platform,the I-DEAS and ANSYS software were integrated,a integral mixed optimization and adaptive simulated annealing optimization method were applied.Under the conditions of the static strength less than the yield strength and the first order dynamic frequency more than three times of the frequency of work,the volume（mass） of the blade decreased by 14.7%.