大功率LED路灯方向敏感性研究

Study on Orientation Effect of High-power Street Lamp

基于计算流体动力学(CFD)方法,构建了包括固体散热结构和周围流体区域的全场三维数学模型。利用该模型进行了强制对流下大功率LED路灯散热性能的方向敏感性研究;并分析了翅片间距和入口风速对其方向敏感性的影响。研究结果表明:板翅式换热器具有明显的方向敏感性。随着翅片间距的增大和入口风速的减小,这种方向敏感性逐渐弱化。

Based on Computational Fluid Dynamics （CFD） method, a whole three-dimensional mathematical model of LED luminaries and external fluid flow are constructed. Using this model, orientation effect on forced con- vection dissipation performance of high-power street lamp is studied. The influence of fins spacing and inlet velocity to orientation sensitivity of it also were analyzed. Research results show that the heat dissipation performance of hor- izontal rectangular fin arrays has obvious orientation effect, and that the orientation effect is weakening with the in- crease of fins spacing and decrease of inlet velocity.