采用CFD软件对常规型大功率LED路灯散热器建立了三维数值模型, 在大空间中进行了耦合数值传热计算, 并用实验验证了数值计算的可靠性。研究了自然对流散热过程中散热器的温度场和周围扰流空气的速度矢量场分布。针对散热器散热过程中, 扰流空气不能进入散热器肋片中间让肋片充分发挥自然对流冷却效果, 提出了一种新的结构设计, 通过数值计算得到了较理想的结构。在同等功率下散热器基板底面最高温度比原模型低了5℃, 肋片平均换热系数提高了17.6%, 显著提高了大功率LED路灯散热器的散热能力。

CFD software is used to establish a 3D numerical model for conventional high-power LED street lamp radiator. Numerical calculations of coupled heat transfer were carried out in a large space and the reliability was verified experimentally. The temperature field of the radiator and the speed vector field distribution of the spoiler air in the process of natural convection were analyzed. In the process of radiator cooling, the spoiler air cannot enter the radiator fin and give full play to the natural convection cooling effect. In this paper, a new structure is obtained by numerical calculations. Under the same power, the maximum temperature of the bottom surface of the radiator substrate is 5 degrees lower than that of the original model and the average fin heat transfer coefficient increases by 17.6%, which significantly improves the cooling capacity of high-power LED street lamp radiator.