Investigation on the Forced Response of a Radial Turbine under Aerodynamic Excitations  

作　　者：MA Chaochen HUANG Zhi QI Mingxu 

机构地区：[1]School of Mechanical Engineering, Beijing Institute of Technology

出　　处：《Journal of Thermal Science》2016年第2期130-137,共8页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51276018)

摘　　要：Rotor blades in a radial turbine with nozzle guide vanes typically experience harmonic aerodynamic excitations due to the rotor stator interaction. Dynamic stresses induced by the harmonic excitations can result in high cycle fatigue(HCF) of the blades. A reliable prediction method for forced response issue is essential to avoid the HCF problem. In this work, the forced response mechanisms were investigated based on a fluid structure interaction(FSI) method. Aerodynamic excitations were obtained by three-dimensional unsteady computational fluid dynamics(CFD) simulation with phase shifted periodic boundary conditions. The first two harmonic pressures were determined as the primary components of the excitation and applied to finite element(FE) model to conduct the computational structural dynamics(CSD) simulation. The computed results from the harmonic forced response analysis show good agreement with the predictions of Singh's advanced frequency evaluation(SAFE) diagram. Moreover, the mode superposition method used in FE simulation offers an efficient way to provide quantitative assessments of mode response levels and resonant strength.

关 键 词：radial turbine forced response aerodynamic excitation FSI SAFE diagram 

分 类 号：TK14[动力工程及工程热物理—热能工程]