基于响应面法的全地形车排气系统结构优化研究

为了研究结构参数对全地形车排气系统散热的影响,采用Fluent软件对排气系统进行流场分析,得到壁面的温度分布图,并通过试验验证有限元模型的准确性。以消声器内隔板孔的直径、隔板到消声器前端的距离、消声器未端圆角半径为设计变量,以排气系统壁面平均温度为优化目标,应用响应面法进行结构参数优化,得到使壁面平均温度最小的一组设计变量值。最后,对改进后的排气系统进行流场分析,并与优化前的数据对比。结果表明,通过设计变量的合理改变,重点关注的消声器处壁面温度明显下降,消声器处壁面4个测试点温度分别下降了10.3%、11.5%、8.0%、10.4%。

The Research on Structural Optimization of ATV Exhaust System Based on Response Surface Method

In order to study the influence of the structure parameters of the exhaust system of all terrain vehicle(ATV) on heat dissipation, the flow field of the exhaust system was analyzed using Fluent software to obtain the temperature distribution of the muffler wall, and the accuracy of the finite element model was verified by experiments. By setting the muffler baffle hole diameter, the distance to the front baffle muffler ,and the radius of muffler as the design variables, and using the average wall temperature of the exhaust system as the optimization goal, the structure parameters were optimized by the response surface method(RSM), thus obtaining the optimum design variables that could minimize the average temperature of the muffler wall. Finally, the flow field of the improved exhaust system was analyzed and compared. Results show that the reasonable change of the design variables can reduce the wall temperature of the muffler. This allows to decrease the temperature at the 4 test points of the muffler wall by 10.3%,11.5%,8%,10.4% respectively.