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本文采用基于颗粒动力学的欧拉双流体模型,对比研究了曳力和湍流对超临界水流化床传热特性的影响,选取了Gidaspow、Syamlal-O’Brien和Wen-Yu三种曳力模型以及标准κ-ε、RNGκ-ε、Realizableκ-ε湍流模型三种高Re数湍流模型及低Re数κ-ε湍流模型。研究结果表明,在三种曳力模型中,Gidaspow曳力模型在超临界水流化床中更为适用;对于所采用的四种κ-ε湍流模型,利用三种高雷诺数湍流模型模拟所得床层与壁面间传热系数基本一致且大于采用低雷诺数模型模拟所得传热系数,而综合考虑,RNGκ-ε湍流模型更适于超临水流化床传热特性的研究。
In this paper, Euler dual-fluid model based on particle dynamics was used to study the influence of drag and turbulence on the heat transfer characteristics of supercritical water fluidized bed. Three drag forces of Gidaspow, Syamlal-O’Brien and Wen-Yu Model and three kinds of high-Re turbulence models with standard κ-ε, RNGκ-ε and Realizable κ-ε turbulence models and a low Re-κ-ε turbulence model. The results show that the Gidaspow drag model is more suitable for supercritical water fluidized bed in the three drag-drag models. For the four κ-ε turbulence models, three high-Reynolds number turbulence models are used to simulate the The heat transfer coefficient between the bed and the wall is basically the same and larger than the heat transfer coefficient simulated by the low Reynolds number model. However, the RNG κ-ε turbulence model is more suitable for the heat transfer characteristics of superclinical fluidized bed.