CALCULATION OF UNSTEADY FAN ROTOR RESPONSE CAUSED BY DOWNSTREAM FLOW DISTORTIONS

被引：7

作者：

OBRIEN, WF

NG, WF

RICHARDSON, SM

机构：

[1] Virginia Polytechnic Inst &, State Univ, Dep of Mechanical, Engineering, Blacksburg, VA, USA, Virginia Polytechnic Inst & State Univ, Dep of Mechanical Engineering, Blacksburg, VA, USA

来源：

JOURNAL OF PROPULSION AND POWER | 1985年 / 1卷 / 06期

关键词：

FANS - Fluid Dynamics - FLOW OF FLUIDS - Mathematical Models - ROTORS;

D O I：

10.2514/3.22829

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

Fluctuating lift caused by flow unsteadiness over fan airfoils is a mechanism for noise generation and aeromechanical excitation in turbofan engines. A method for the calculation of the circumferentially-varying flowfield in an axial-flow fan with downstream stator guide vanes and casing support struts is described. A time-marching solution for the rotor is coupled to a potential flow solution for downstream flow in the vane and strut regions. The influence of strut design parameters is studied employing the method. It is found that strut thickness, circumferential spacing, and sepation distance from the rotor are primary variables determining unsteady rotor response. The stator row is shown to reduce the effective rotor-strut spacing, contributing to increased rotor-strut flow interaction. Good agreement is obtained between predicted and measured on-rotor pressure fluctuations from a test rig.

引用

页码：464 / 469

页数：6