基于圆环孔合成射流器的LED前照灯散热控制

Thermal Control of LED Headlamp Based on Annular Synthetic Jet

采用实验方法明确圆环孔合成射流器的速度分布特征,利用参数化方法获得最佳散热距离,将其与发光二极管(LED)前照灯组合后采用实验方法明确合成射流器对LED前照灯的散热效果。基于大涡模拟对该部件的流场及温度场进行解算,在验证仿真方法有效性的同时明确温度及换热系数的分布规律。采用正交分解法对该部件流场及铝基板表面对流换热系数进行分析,表明壁面对流换热系数的分布特征及合成射流器的散热控制效果主要由流场中的大尺度涡结构所决定。

The velocity distribution profiles of annular synthetic jet were identified by experimental method and the optimum heat dissipation distance was obtained by parametric study.By combining it with LED headlamp,the heat dissipation effect of the synthetic jet on LED headlamp was confirmed by the experimental method.Based on large eddy simulation,the flow field and temperature field of the component were solved,and the distribution of temperature and heat transfer coefficient was clarified while verifying the validity of the simulation method.POD method was used to analyze the flow field and convective heat transfer coefficient on the surface of aluminum substrate.The results indicated that the distribution characteristics of convective heat transfer coefficient and thermal control effect of synthetic jet are mainly determined by the large-scale eddy of the flow field.