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为了验证湍流二方程模型在数值模拟发汗冷却过程的适用性,在PHEONICS3.3软件平台上采用两层k-ε湍流模型对无发汗冷却和有发汗冷却时的矩形槽道内湍流流动和换热进行了数值模拟。计算结果表明:发汗冷却使得边界层显著增厚,壁面摩擦阻力因数大为减小;随着冷却气体流量的增加,壁面温度和局部对流换热系数都大大下降。在注入率为1%左右时,发汗冷却段的壁面温度相对值降到了20%左右,局部对流换热系数相对值降到了50%以下。所得到的计算结果与已有关系式符合得很好:注入率在2%以内时误差小于10%。
In order to verify the applicability of the turbulent two-equation model in numerical simulation of sweat cooling process, a two-layer k-ε turbulence model was adopted on the PHEONICS3.3 software platform for turbulent flow and heat transfer in a rectangular channel without sweating and sweating Numerical simulation. The calculation results show that the swell cooling makes the boundary layer thicker and the frictional resistance factor of the wall greatly decreases. With the increase of the cooling gas flow rate, the wall temperature and the local convection heat transfer coefficient decrease greatly. When the injection rate is about 1%, the relative value of the wall temperature in the sweat cooling section is reduced to about 20%, and the relative value of the local convective heat transfer coefficient drops below 50%. The calculated results are in good agreement with the existing ones: the error is less than 10% when the injection rate is within 2%.