柴油发动机排气尾管的热应力分析与设计改进

Thermal-stress Analysis and Improvement of Exhaust Tail-Tube of Diesel Engine

某型号的柴油发动机配套轮式装载机使用后,常出现排气尾管在根部处开裂。深入分析排气尾管的结构载荷与温度载荷的特点,判断出开裂的主要原因。同时,基于ANSYS软件分析平台,对排气尾管进行热与结构的有限元耦合分析,从理论计算上验证了开裂分析的正确性。根据开裂原因,对排气尾管进行设计改进。并利用有限元计算模型,对比排气尾管改进前后的性能,证明设计改进有效。

The Exhaust tai-tube root often is broken after some kind of diesel engine is used in wheel loader. The main reason of exhaust tal-tuhe craze is found after characteristic of temperature load and structure load is deeply analyzed. Finite element coupling analysis of heat and structure is done to exhaust tail-bube based on ansys. Craze analysis is right by theory calculation. Improvement is done according to craze reason. The improvement is efficient by comparing before performance with new performance in ANSYS model. This method will be worthful reference for the same problem.