发动机舱排气引射系统多目标优化设计  

Multi-objective Optimal Design of Underhood Exhaust Ejector System in Engine Compartment

作　　者：钱尧一[1] 侯亮[1] 卜祥建 林森泉[1] 李胜玉 

机构地区：[1]厦门大学机电工程系 [2]厦门厦工机械股份有限公司

出　　处：《工程机械》2014年第1期40-45,120,共6页Construction Machinery and Equipment

基　　金：国家科技支撑计划课题(2013BAF07B04)

摘　　要：为了满足工程机械散热性能需求并实现节能降噪,将排气引射系统应用到结构设计中。为获得排气引射系统最佳性能参数,提出以引射系数和截面压差为目标函数的多目标优化设计方法。利用ANSYS Workbench平台,通过中心复合设计试验方法确定设计点,利用CFX流体动力学软件对不同设计点进行数值模拟,根据获取的响应值建立输入与输出关系的响应面模型,运用多目标遗传算法对引射系数与截面压差进行多目标优化,得到符合设计原则的Pareto优化解集。将排气引射系统应用到发动机舱中,与电子扇方案对比,进行多角度评价。结果表明,通过多目标优化,排气引射系统的引射系数提高50.4%,截面压差下降2.3%,与电子扇方案相比,可有效提高空气侧流量,提高冷却系统散热性能。How to design an exhaust jet system for the engine compartment.In order to satisfy the demand for right radiating function at lower cost and minimal noise level we had to introduce an exhaust jet system to the structural design.And then,for optimal functional data we put forth a multi-goal optimized design concept as based on the jet factors and sectional pressure differentials as the target function.Again,we utilized an ANSYS Workbench platform to set the design points thru a centralized compound design test while using CFX software of fluidic mechanics to simulate data value at various design points,while using genetic algorithm of multi targets to optimize the jet factors and the sectional pressure differences according to the responding value so had got to construct a response area model for relationship of the input and output to have got diversifications in the multi target optimization before obtaining Pareto optimal solutions which meet the design principles.Finally,we applied the jet system to the engine compartment to be compared with the electronic fan and made an evaluation at angles.The results show that thru multi target optimization jet factor of the exhaust jet system has been increased by 50.4%while the sectional pressure difference decreased by 2.3%that can increase flow rate effectively at the air inlet side,thus upgrading radiating function at the cooling system,as compared with the electronic fan.

关 键 词：排气引射 多目标优化 响应面 中心复合设计 

分 类 号：TU602[建筑科学—建筑技术科学]