建立了一种百叶窗翅片的二维数学模型，采用SIMPLER算法，对空气流经翅片的传热和流动特性进行了数值模拟计算，获得了百叶窗翅片的温度场，速度场和流线图。对不同百叶窗倾角和不同雷诺数进行了数值模拟，结果揭示了阻力系数和Nu数的变化规律。在此基础上，采用场协同原理分析了温度梯度与速度矢量的夹角对百叶窗翅片换热的影响-A two dimensional numerical model is established for a type of louvered fin, the temperature field, velocity field and streamlines are obtained by numerical simulation for air side heat transfer and fluid flow with SIMPLER algorithm. Different Reynolds numbers and different louver angles are numerically studied　the results reveal the variation of resistance coefficient and Nu number. The effects of angle between temperature gradients and velocity vector for heat transfer characteristics are analyzed by field synergy principle on the base of the model.