基于Fluent的LED路灯模组散热仿真设计

Heat Dissipation Design for LED Street Light ModuleBased on the Fluent Simulation

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.