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本文针对燃机带肋冷却通道发展了一种考虑近壁特性和远壁流动各向异性特点的代数各向异性涡黏模型。本文针对肋片处分离流动的各向异性特点,结合隐式代数应力模型和各向同性涡黏模型,推导各向异性因子修正三个正向涡黏系数,反映正雷诺应力的各向异性特点。同时,通过近壁分析完善k和ε封闭形式。将各向异性涡黏模型应用到,1)后台阶流动预测中,湍流流动预测精度提高约10%;2)带90°肋通道流动传热预测中,平均流动预测精度得到改善,传热预测精度提高6%~10%。结果表明,本文针对内冷通道的分离流动作出的各向异性修正是有效的。
In this paper, an algebraic anisotropic eddy viscosity model considering the characteristics of near-wall flow and anisotropy of far-wall flow is developed for gas-cooled tunnels. In this paper, based on the anisotropic characteristics of the separation flow at the fins, the anisotropic factors are deduced by combining the implicit algebraic stress model and the isotropic eddy viscosity model. The anisotropic characteristics of the positive Reynolds stress . At the same time, k and ε closed forms are improved by near-wall analysis. The anisotropic eddy viscosity model is applied to 1) the prediction accuracy of turbulent flow in backflow prediction is improved by about 10%; 2) the average flow prediction accuracy is improved in the flow heat transfer prediction with 90 ° rib channel, and the heat transfer prediction Accuracy increased by 6% to 10%. The results show that the proposed anisotropic correction for the separation flow in the internal cooling channels is effective.