| Recently, with the vigorous development for the technique of LED(light emitting diode)in the filed of lighting, thermal management is a key issue which has great effect on the output power and lifetime of the electronic device. LED light sources offer various advantages to conventional light sources: shorter response time, higher efficiency, lower power consumption, environmental protection, smaller volume, longer lifetime, better shock resistance and so on. However, with the power increasing, heat dissipation become a particularly problem. In this paper, the thermal management on the horizontal rectangular fin arrays for the LED street lamp type of GH-4 are studied on natural convection in a large space. The investigation were performed under the theoretical arithmetic, experimentation and numerical simulation respectively. The specific responsibilities were summarized as follows:For the LED street lamp type of GH-4, the paper estimated the junction temperature of LED chip and of basal plate within the input power limits of 50 W to 150 W; Designed test system on natural convection in a large space for the LED street lamp type of GH-4.The results reached after contrastive analysis that there was a good agreement between numerical simulation and experimental study when using low-Reynolds- number of the k-εmodel, outlet pressure boundary condition at the same time, and the error was within 4 %. And described the temperature filed and velocity field for the fin arrays of LEDs.In this paper, the wall-function method and low-Reynolds-number of the k-εmodel were used respectively for low Reynolds number turbulent flows. Simultaneity, both inlet pressure boundary condition and outlet pressure boundary condition are applied to definite condition of computational domain in large space. For the solution of format of pressure differences, it presented the SIMPLE standard numeration and the PRESTO numeration. It assembled twelve methods for the numerical simulation.
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