针对大功率LED具有高热流密度的特点,本文采用板式脉动热管与翅片的组合对额定功率为100 W的LED进行自然对流冷却实验研究.实验发现,脉动热管自然对流对于功率在52 W以下的LED取得较好冷却效果;板式脉动热管自然对流从启动到稳定过程与强制对流存在较大差异;脉动热管存在一个最佳充液率30％～50％;丙酮的冷却效果比乙醇更好.三角形截面脉动热管的热阻比方形截面热阻低;水力直径为1 mm的脉动热管比0.58 mm的传热性能好.增加翅片面积可以较好地降低LED基板温度.通过对加热段各点的实验分析表明,脉动热管在各功率运行中,加热段均温性良好,被控制在2.5℃C以内.
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