| LED,with advantages of efficiency,safety,energy saving and eco-friendliness,has become the mainstream lighting source.Meanwhile,the first light source of LED street light.With ten years’ development of high power LED street light,technology,such as light,electronic components has become mature.Under the constraint of materials and Luminous efficiency,Chip junction temperature and the cooling efficiency,is still research focus in the application of high power LED.This essay adopts the methods of experimental test,numerical simulation and theoretical analysis to analyzes fin radiator temperature field and flow field in natural convection based on 50 w finned radiator unit of high power LED street light in some big state-run company and to improve its structure and conduct a contrast verification in natural convection cooling effect of oblique small fin and non-oblique small fin,try to reduce production cost and improve the efficiency of heat dissipation.In the course of simulation calculation,I choose high-density grid generation method and further ascend the accuracy of simulation calculation according to the circumstance of high power LED street light fin radiator,effect of thermal conductivity of thermal conductive silicone and the characteristic of small size of thermal conductive silicone.In terms of natural convection,the radiator prototype of oblique small fin increases the heat dissipation area but slows down the rise velocity of air natural convection radiator surface and reduces the natural convection heat release.The trade-off between them becomes the key to the radiator design.Research finding shows: Without changing the original main geometric structure,removing the oblique small fin radiator fin after improvement not only improves the efficiency of the heat dissipation,but also reduces the manufacturing cost for the company.It has high value of engineering application and certain scientific significance. |
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