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为了提高发光二极管(LED)的散热性能,基于烟囱效应原理,设计了一种特殊的直筒式烟囱结构的LED冷却用散热器。通过Solidworks软件构建三维模型,利用其插件Flow Simulation对构建的模型进行热仿真。研究了不同烟囱高度、通风口形状和大小对烟囱效应散热效果的影响。研究结果表明:烟囱效应有效地提高了散热器的对流散热性能。当烟囱高度为50mm、通风口等效直径为8mm、通风口形状为梯形时,LED最高温度为61.60℃,比优化前降低了6.54℃。与传统散热器对比,LED最高温度降低了8.89℃。实验中4个监测点的实际温度与仿真所得温度的平均误差为4.0%,在允许范围内,验证了以上研究的正确性。所设计的散热器可以很好地满足自然对流条件下LED的工作要求。
In order to improve the heat dissipation performance of light emitting diode (LED), based on the principle of chimney effect, a special LED cooling radiator with a straight chimney structure was designed. Through the Solidworks software to build three-dimensional model, using its plug-in Flow Simulation on the model of the thermal simulation. The effects of different stack height, vent shape and size on the cooling effect of chimney effect were studied. The results show that the chimney effect effectively improves the convective heat dissipation performance of the radiator. When the chimney height is 50mm, the equivalent diameter of the vent is 8mm and the shape of the vent is trapezoidal, the maximum temperature of the LED is 61.60 ℃, which is 6.54 ℃ lower than that before optimization. Compared with the traditional radiator, LED maximum temperature decreased by 8.89 ℃. In the experiment, the average error between the actual temperature of the four monitoring points and the simulated temperature was 4.0%, and within the allowable range, the correctness of the above research was verified. The designed heat sink can well meet the working requirements of LED under natural convection conditions.