基于Fluent二次开发的整车热管理计算
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En鑰汽车工程师FOCUS第术年1月摘要:在某车型的正向开发阶段,出现了车辆无法通过热平衡试验考核的问题。
为解决该问题,文章运用CFD分析手段,对该车型机舱流场进行了仿真分析,并结合热平衡试验考核的过程数据,找出问题真因;基于找出的问题真因,有针对性地制定了一系列优化方案并通过CFD仿真分析和实车试验进行验证,根据试验结果来确定最终整车改进方案,成功地解决了问题。
结果表明,综合运用CFD分析和整车试验可以有效解决整车热管理方面的问题,并在一定程度上节约时间和人力。
关键词:热管理;CFD;机舱流场;试验Research on Improvement Scheme of Vehicle Thermal Management Performance Basedon CFD Analysis and TestAbstract:In the positive development phase of a vehicle under research,there was a problem that the vehicle could not passthe thermal balance test.In order to solve this problem,this paper uses CFD analysis methods to simulate and analyze the flow field of the engine room of the vehicle under development,combined with the process data of the thermal balance test assessment,to try to find the true cause of the problem?based on the true cause of the problem,it is targeted A series of optimization schemes were formulated and verified through CFD simulation analysis and actual vehicle test.According to thetest results,the final vehicle improvement scheme was determined and the problem was successfully solved.The results show that the comprehensive application of CFD analysis and vehicle test can effectively solve the problem of vehicle thermal management and save time and manpower to a certain extent.Key words:Thermal management;CDF;Cabin flow field;Test为了满足日益严苛的油耗和排放法规,也为了满足消费者对美观性的要求,工程师越来越倾向于将车辆外观设计的更加流线型,这就导致发动机舱可使用空间减少;而增压和缸内直喷等新技术的应用,使机舱内部件增多且产生更多的热量叫所以保证发动机舱达到热平衡是车型开发性能目标之一。
基于 Fluent二次开发的装甲车辆红外仿真郑朝亮;杨余旺;林益;雍成成;林群青【摘要】In view of the limitations of software Fluent in armored vehicles infrared simulation , second develop-ment of Fluent was carried out by using language VC ++, which achieved the effect that commands are sent through the VC platform to Fluent and Fluent feeds information back to VC platform .In this way , the infrared simulation program of armored vehicles is compiled .Moreover, the program is successfully added with the com-putation module of ground background and thermal model , which Fluent does not possess but is essential to the infrared simulation of armored vehicles .Consequently , a convenient and comprehensive analog calculation pro-gram has come into being for the infrared simulation of vehicles .Research results show that the system design is feasible.%针对Fluent软件的优点及其在装甲车辆红外仿真的局限性,用VC++开发工具,通过VC平台向Fluent发送命令、Fluent向VC平台进行信息反馈的方式,编制了装甲车辆红外仿真程序,成功实现了在程序中加入热模型、地面背景计算模块等Fluent软件不具备的,但是对于车辆红外仿真却是必要的功能,最终形成用于车辆红外仿真的较方便、全面的模拟计算程序。
基于FLUENT的汽车管带式散热器整体模拟邵兴杨【期刊名称】《《现代机械》》【年(卷),期】2019(000)004【总页数】4页(P25-28)【关键词】Fluent; 多孔介质; 散热性能; 风阻; 水阻【作者】邵兴杨【作者单位】贵州永红散热器公司贵州贵阳550000【正文语种】中文【中图分类】U464.138+.20 引言汽车管带式散热器换热是一个复杂的过程,存在流体流动,也存在换热过程。
在散热器初期设计时,无法制造试验件进行有效的试验分析,且简单的三维模拟无法进行精确地预测。
同时散热管、散热带结构尺寸较为微小,无法建立三维模型及划分边界层网格,这就会延长设计周期,增加成本,对新品的开发是不利的。
那么本文采用三维造型软件SolidWorks与流体有限元分析软件Fluent对散热器的散热性能、风阻、流阻进行三维模拟计算,利用多孔介质对散热管、散热带进行简化,达到初期预测的效果,并通过试验对模型进行验证。
1 整体仿真设计思路利用多孔介质体积平均化的思想,将散热管、散热带等简化为多孔介质。
计算局部单元得出多孔介质的惯性阻力系数、黏性阻力系数、等效孔隙率,再将所得系数带入整体模型的多孔介质中得出模拟数据并与试验进行对标,得出结论。
1.1 流阻整体数值模拟1.1.1 建立局部散热管模型及流体域模型图1 在SolidWorks建立散热管三维模型局部散热管与整体模型中散热管只是进口流量不同,本文按照散热管实际尺寸在SolidWorks中建立三维模型,如图1所示。
这是一个高频焊接扁管,取长度为50 mm。
将扁管模型导入Fluent中减出流域并划分网格,如图2所示。
根据散热器整体流量从1000 kg/h到5000 kg/h间,分配到48根散热管上,取每根散热管截面进口流速从0.334 m/s到1.671 m/s。
考虑到散热管长宽比较小,为获得较准的阻力,在流体壁面划分多层边界层网格。
图2 导入Fluent后的模型如表1所示,为局部散热管模拟计算在不同进口流速下的阻力。
基于CFD的汽车发动机舱热管理及优化谢暴;陶其铭【摘要】为了研究汽车发动机舱热管理,设计出与整车开发流程相匹配的发动机舱热管理工作的模拟分析流程。
基于“计算流体力学”CFD软件中的STAR-CCM+,分析了某车型发动机舱的冷流场,提出其前端进气格栅的优化方案。
该优化方案使流经散热器与冷凝器的风量分别提升7.0%和9.6%。
获得了优化的发动机舱的温度分布云图及热平衡温度。
针对风险部件进行舱内热害仿真分析,得到目标监测点温度满足许用温度要求。
水温试验模拟仿真分析中的整车热平衡,仿真精度≥85%,舱内热害仿真精度≥95%。
结果表明:应用该流程具有较高的计算效率和可靠性。
%A simulation analysis process of nacel e thermal management was designed to investigate the thermal management in cabin of a developing automobile considering lfow match. An optimization scheme of the front air intake gril e was made by the nacel e cold lfow ifeld analysis to a model automobile based on the STAR-CCM+of the CFD (Computational Fluid Dynamics) software. The optimal scheme increased air volume by 7.0%for radiator and by 9.6%for condenser. The thermal equilibrium temperatures and the temperature distributions in the cloud for the optimal scheme were obtained to analyze the thermal pol ution in an automobile cabin. The target temperature for risk parts was obtained by cabin thermal damage simulation to monitor the satisfy requirement of al owable temperature. The thermal equilibrium simulation results for an automobile were veriifed by water experiments with an accuracy of 85%or higher. The cabin thermal damage has an accuracy of 95%or more.Therefore, the design process has a high computing efifciency and a high reliability.【期刊名称】《汽车安全与节能学报》【年(卷),期】2016(007)001【总页数】8页(P115-122)【关键词】汽车发动机舱;热害;热管理;CFD软件;冷流场;热平衡【作者】谢暴;陶其铭【作者单位】安徽职业技术学院机械工程系,合肥230011,中国;江淮汽车股份有限公司,合肥230022,中国【正文语种】中文【中图分类】TH123Dynamics); cold flow field; heat balance现代汽车采用的低车身、小型化的流线型设计趋向[1],使得发动机舱内空间狭小、零部件安放位置紧凑;而增压+缸内喷、分层燃烧、双离合变速器(dual clutch transmission,DCT)等众多新技术在汽车上的应用,也使机舱内附件增多且产生较大的工作热量;从而易形成过热的发动机舱环境[2]。