通过对涡流管的热力分析和流动分析，建立其内部过程的数学模型。从速度场的变化推导内部热分离的温度方程。实验系统测量涡流管内部温度场及速度场，理论计算值与实验值吻合。 Through the analysis of the vortex tube’s thermal and flow analysis, the mathematical model of the internal process is established. Derivation of Temperature Equation of Internal Thermal Separation from the Change of Velocity Field. The experimental system is used to measure the temperature field and velocity field in the vortex tube. The calculated values ​​are in good agreement with the experimental ones.