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本文针对室内普遍存在的空气热分层流现象及其空间湍流基本特征,提出了一种适用的湍流模型——改良型的RNG双方程模型,并配以改良的复合型壁面函数,以适应空气热分层对流运动中产生的空间湍流衰减问题,精确求解高、低Re数湍流共存的室内流场。在此基础上,采用方腔混合对流和AR=1/2双跨空间高Re数流动的实验数据,对湍流改良模型进行了充分的验证,为相关问题的研究及工程应用提供了有效手段。
In this paper, aiming at indoor air stratification phenomenon and its basic characteristics of spatial turbulence, a suitable turbulence model, an improved RNG two-equation model and an improved composite wall function are proposed to adapt to the air The indoor turbulent flow decay problem caused by the thermal stratification convection motion is solved accurately. On this basis, the experimental data of square mixed convection and AR = 1/2 double-space high Reynolds number flow are used to verify the turbulence model, which provides an effective means for the research and engineering application of related problems.