客车发动机舱热管理系统的数值仿真与实验验证
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摘要
依据整车环境模拟实验,选取最大扭矩点、中间点和最大功率点(对应的发动机转速分别为1 800,2 800和3 450 r/min)作为发动机舱热管理系统分析的3个工况,应用FLUENT建立发动机舱热管理系统的三维仿真模型,根据实验边界条件,进行风速场和温度场的耦合仿真。采用稳态计算方法,获得发动机舱内外稳定的风速场和温度场分布。对比分析发现仿真结果与实验结果的均方根相对误差在合理范围内,从而验证该发动机舱热管理系统仿真模型的有效性。
According to the vehicle environment simulation experiment,the maximum torque point,the interpolation point,and the maximum power point( the corresponding engine speeds are 1 800,2 800 and 3 450 r/min) are selected as three working conditions for analyzing the underhood thermal management system. The 3 D simulation model of underhood thermal management system is established by FLUENT. Based on the experimental boundary conditions,the coupling simulation of wind speed field and temperature field is carried out. The steady state calculation method is used to obtain the wind speed and temperature field distribution inside and outside the underhood. The comparative analysis shows that the root-mean-square relative error between the simulation values and the experimental values is within a reasonable range,which can verify the effectiveness of this simulation model of underhood thermal management system.
According to the vehicle environment simulation experiment,the maximum torque point,the interpolation point,and the maximum power point( the corresponding engine speeds are 1 800,2 800 and 3 450 r/min) are selected as three working conditions for analyzing the underhood thermal management system. The 3 D simulation model of underhood thermal management system is established by FLUENT. Based on the experimental boundary conditions,the coupling simulation of wind speed field and temperature field is carried out. The steady state calculation method is used to obtain the wind speed and temperature field distribution inside and outside the underhood. The comparative analysis shows that the root-mean-square relative error between the simulation values and the experimental values is within a reasonable range,which can verify the effectiveness of this simulation model of underhood thermal management system.
引文
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[3]罗仁宏,郭健忠,胡溧,等.某商用车发动机舱散热性能提升与试验研究[J].制造业自动化,2015,37(4):88-91.DOI:10.3969/j.issn.1009-0134.2015.07.027.LUO R H,GUO J Z,HU L,et al.Heat dissipation improvement and test of a commercial vehicle engine compartment[J].Manufacturing Automation,2015,37(4):88-91.DOI:10.3969/j.issn.1009-0134.2015.07.027.
[4]王嘉炜,买靖东,张佳卉.热管理技术在未来车辆发展中的应用展望[J].车辆与动力技术,2016(1):60-63.DOI:10.16599/j.cnki.1009-4687.20150923.001.WANG J W,MAI J D,ZHANG J H.Application prospect of thermal management technology in development of future vehicles[J].Vehicle&Power Technology,2016(1):60-63.DOI:10.16599/j.cnki.1009-4687.20150923.001.
[5]WANG G H,GAO Q,ZHANG T S,et al.A simulation approach of underhood thermal management[J].Advances in Engineering Software,2016,100(C):43-52.
[6]PANG S C,KALAM M A,MASJUKI H H,et al.A review on air flow and coolant flow circuit in vehicles’cooling system[J].International Journal of Heat and Mass Transfer,2012,55(23-24):6295-6306.
[7]BANJAC T,WURZENBERGER J C,KATRANIK T.Assessment of engine thermal management through advanced system engineering modeling[J].Advances in Engineering Software,2014,71:19-33.
[8]COSTA E A.CFD approach on underhood thermal management of passenger cars and trucks[DB/OL].(2003-11-18)[2017-06-10].http://papers.sae.org/2003-01-3577/.DOI:10.4271/2003-01-3577.
[9]胡文成.某卡车发动机舱散热特性分析[D].南京:南京理工大学,2014.
[10]殷良艳.某商用车发动机舱散热分析及结构改进[D].武汉:武汉科技大学,2014.
[11]庞加斌,刘晓晖,陈力,等.汽车风洞试验中的雷诺数、阻塞和边界层效应问题综述[J].汽车工程,2009,31(7):609-615.PANG J B,LIU X H,CHEN L,et al.A review on Reynolds number,blockage and boundary layer effects in automotive wind tunnel tests[J].Automotive Engineering,2009,31(7):609-615.
[12]袁志群,谷正气,方遒,等.基于冷却系统数值模型的发动机舱流动阻力特性研究[J].中国机械工程,2011,22(4):474-478.YUAN Z Q,GU Z Q,FANG Q,et al.Study on drag characteristics for flow field of underhood based on numerical model of cooling system[J].China Mechanical Engineering,2011,22(4):474-478.
[13]柳阳,许春铁,昝建明,等.基于FLUENT和STAR-CCM+的整车气动噪声源对比[J].计算机辅助工程,2016,25(5):22-28.DOI:10.13340/j.cae.2016.05.005.LIU Y,XU C T,ZAN J M,et al.Comparison of vehicle aerodynamic noise source based on FLUENT and STAR-CCM+[J].Computer Aided Engineering,2016,25(5):22-28.DOI:10.13340/j.cae.2016.05.005.