为了更好设计LED 液冷换热热沉，提高大功率LED 热沉的综合换热性能，模拟计算了三种结构热沉的LED芯片最高结温和器件热阻，运用场协同原理分析了不同LED 热沉结构的换热原理，以及努塞尔数和摩擦因子随雷诺数的变化规律；并用强化传热因子来表述换热能力和流动阻力的综合换热效果。结果表明，运用30°角矩形翅片的LED 结温和器件热阻最低，换热能力最好；菱形翅片次之，垂直平行翅片最差。30°角矩形翅片和菱形翅片由于倾斜角的存在，在增加换热能力的同时也增加了流动阻力；综合分析换热能力和流动阻力，菱形翅片的综合换热性能最好。

To design the heat sink of liquid cooling system effectively and improve the comprehensive performance of heat transfer for high power LEDs, the LED maximum temperature and thermal resistance of three types of heat sinks are numerically investigated. The mechanism of heat transfer is analyzed by using the field synergy principle, and the variation of the Nusselt number and friction factor are examined with Reynolds number. And using the thermal enhancement factor to express the comprehensive performance of heat transfer between the heat transfer performance and flow resistance. The results show that the LED maximum temperature and thermal resistance using the rectangular fin with the inclined angle of 30° is lowest, the heat transfer enhancement is highest, and rhombic fin is followed, vertical parallel fin is worst. The rectangular fin with the inclined angle of 30° and rhombic fin have the higher flow resistance when they have the higher heat transfer performance, because of the oblique angle. Considering the heat transfer performance and flow resistance, rhombic fin has the highest comprehensive performance of heat transfer.