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根据边界层理论,对管内变物性湍流强制对流换热控制方程组进行简化;并通过考虑湍流输运中的密度脉动,对传统的混合长度湍流模型进行改进,使之能同时适用于常物性流动和变物性流动。基于该计算模型,对管内超临界压力水湍流对流换热特性进行了数值模拟。计算结果表明,本文的计算模型能正确地反映出超临界工况下的变物性对流换热特征,换热系数预测值与相应实验数据符合良好,并且计算过程极为高效。
According to the theory of boundary layer, the governing equations of forced turbulent convective heat transfer inside the tube are simplified. By considering the density pulsation in turbulent transport, the traditional mixed-length turbulence model is improved so that it can be applied to both normal flow And variable physical flow. Based on this calculation model, the convective heat transfer characteristics of supercritical pressure water turbulent flow in a tube were numerically simulated. The calculation results show that the calculation model in this paper can accurately reflect the characteristics of convective heat transfer in supercritical conditions. The predicted values of heat transfer coefficients are in good agreement with the corresponding experimental data, and the calculation process is extremely efficient.