基于气-固耦合的风扇应力分析与结构优化

高建红^1,2，刘伦伦^1,2，段良坤^1,2，王俊然^1,2，付春雨^1,2

1.内燃机可靠性国家重点实验室,山东 潍坊  261061;

2.潍柴动力股份有限公司,山东 潍坊  261061

摘要：为解决某装载机工作过程中出现的风扇断裂故障，采用气-固耦合仿真方法，考虑风扇叶片静压及风扇作业旋转离心力影响，对故障风扇进行应力仿真计算。仿真分析结果表明，风扇断裂位置应力较大是风扇断裂的主要原因。对风扇结构进行优化，将轮毂厚度由0.3 mm增加至0.4 mm，并对优化后的风扇进行仿真和市场应用验证。仿真分析显示优化后风扇轮毂最大应力由204.7 MPa下降到141.5 MPa，且市场验证无故障反馈，有效解决了风扇断裂故障。

关键词：风扇；气固耦合；静压；离心力；应力；结构优化

Stress analysis of fan and its structure optimization based on gas-solid coupling

GAO Jianhong^1,2, LIU Lunlun^1,2, DUAN Liangkun^1,2, WANG Junran^1,2, FU Chunyu^1,2

1. State Key Laboratory of Engine Reliability, Weifang 261061, China; 2.Weichai Power Co., Ltd., Weifang 261061, China

Abstract：In order to solve the fan fracture fault during the operation of a loader, the gas-solid coupling simulation method is used to simulate the stress of the fault fan, taking into account the static pressure of the fan blade and the centrifugal force of the fan rotation. The results of simulation analysis show that the main reason of fan fracture is the large stress at the fan fracture position. The fan structure is optimized to increase the hub thickness from 0.3 mm to 0.4 mm, and the optimized fan is simulated and verified by market application. The simulation analysis shows that the maximum stress of the fan hub decreased from 204.7 MPa to 141.5 MPa after optimization, and the market has verified that there is no fault feedback, which effectively solves the fan fracture fault.

Keywords:fan; gas-solid coupling; static pressure; centrifugal force; stress; structure optimization