基于Fluent的LED路灯模组散热仿真设计
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摘要
通过改善散热结构设计来降低LED结温已经成为LED路灯模组大规模应用的关键技术之一。考虑充分利用空气自然对流来提高散热效果,本文基于Fluent流体仿真方法研究了空气流动速率和流动方向对五种不同的LED路灯模组散热器散热效果的影响。研究结果表明:①在限定散热器质量和高度条件下,圆管型散热器具有较好的散热效果,这是由于它既具有较大的空气接触面积,又会在尾迹区形成漩涡状的紊流,这可以降低热边界层厚度,减小导热热阻,提高散热效率;②在考虑不同空气流动方向的情况下,空气流向与LED模组平面成45°夹角方向时散热器的散热效果最佳;③最后,模拟空气流动实验验证了本文提出的LED路灯模组散热仿真设计方法的可行性。
Improving heat dissipation design and lower the LED's junction temperature has already become one of the critical techniques to promote the LED street light products. By considering the air nature convection to improve the heat dissipation performance with Fluent fluid simulations,this paper investigates the effects of air flow velocity and flow direction on the heat dissipations of five different heat sinks in the street light module. The results show that: ①when the weight and height of heat sinks are constrained,the heat pipe has a better heat dissipation efficiency,as it not only has a larger contact area with air but also constructs a circinate turbulent flow at each trail,which can lower the thickness of heat boundary layer,reduce the thermal resistance and improve the heat dissipation efficiency. ②with considering the different air flow directions,the heat dissipation efficiency is better if the air flows to the LED module plane with the 45° angle. ③finally,the comparison between the measurements of simulated air flow experiment and the Fluent simulation results of selected LED street light module indicates the feasibility of proposed method in this paper.
Improving heat dissipation design and lower the LED's junction temperature has already become one of the critical techniques to promote the LED street light products. By considering the air nature convection to improve the heat dissipation performance with Fluent fluid simulations,this paper investigates the effects of air flow velocity and flow direction on the heat dissipations of five different heat sinks in the street light module. The results show that: ①when the weight and height of heat sinks are constrained,the heat pipe has a better heat dissipation efficiency,as it not only has a larger contact area with air but also constructs a circinate turbulent flow at each trail,which can lower the thickness of heat boundary layer,reduce the thermal resistance and improve the heat dissipation efficiency. ②with considering the different air flow directions,the heat dissipation efficiency is better if the air flows to the LED module plane with the 45° angle. ③finally,the comparison between the measurements of simulated air flow experiment and the Fluent simulation results of selected LED street light module indicates the feasibility of proposed method in this paper.
引文
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[15]贾磊,季璨,江亚柯,等.太阳花散热器的热性能分析[J].山东科学,2018,31(3):48-54.
[16]龚振兴,鹿博,孙永升.散热片基板开孔对自然对流换热的影响[J].热科学与技术,2016,15(5):358-362.
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[18]黄茂静,包芸.湍流热对流近底板流态与温度边界层特性[J].物理学报,2016,65(20):204702.
[19]李国能,方佳,郑友取.层流脉动流中平行圆柱体的温度边界层[J].热科学与技术,2015,14(3):208-213.
[2]刘小凤.关于大功率LED散热技术分析[J].电子世界,2018(10):145-146.
[3]王平安,王云飞,马丽娟.大功率LED灯具散热问题研究[J].科技展望,2016,26(26):44.
[4]梁锋,赵连玉,张慧,等.基于平板微热管阵列的大功率LED路灯散热研究[J].照明工程学报,2016,27(5):107-111.
[5]雷伟利.浅析流行LED照明灯具的散热设计及分析[J].机电工程技术,2017(S2):584-587.
[6]张征宇.大功率LED散热结构研究[J].电子测试,2017(10):38-39.
[7]梁才航,杨永旺,何壮.LED路灯散热器散热性能的数值模拟[J].照明工程学报,2016,27(1):124-128.
[8]李思琪,张善端.大功率LED散热技术研究现状[J].光源与照明,2017(3):13-16.
[9]张建新,杨庆新,牛萍娟,等.LED板状肋片散热器性能的方向效应[J].发光学报,2015,36(7):846-853.
[10]郭凌曦,左敦稳,孙玉利,等.肋片截面及安装角度对LED散热性能的影响[J].半导体光电,2014,35(3):484-487.
[11]陈启勇,何川,高园园.大功率LED路灯散热器自然对流的数值研究[J].半导体光电,2011,32(4):498-501.
[12]阎军,孙兴盛,王乜,等.半导体照明灯具典型散热结构分析与优化[J].固体力学学报,2010,31(S1):285-293.
[13]张卫红.关于大功率LED散热机理相关问题的分析[J].机电工程技术,2017(S2):320-323.
[14]闫兴宝.浅析Ansys软件原理及工程应用[J].建材与装饰,2017(32):296-297.
[15]贾磊,季璨,江亚柯,等.太阳花散热器的热性能分析[J].山东科学,2018,31(3):48-54.
[16]龚振兴,鹿博,孙永升.散热片基板开孔对自然对流换热的影响[J].热科学与技术,2016,15(5):358-362.
[17]常德功,吕明利,于宁宁.钢质异型管散热器的设计与性能测试[J].煤气与热力,2009,29(1):13-15.
[18]黄茂静,包芸.湍流热对流近底板流态与温度边界层特性[J].物理学报,2016,65(20):204702.
[19]李国能,方佳,郑友取.层流脉动流中平行圆柱体的温度边界层[J].热科学与技术,2015,14(3):208-213.