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A double-k-ε and multi-δ pdf model for turbulent gas-liquid reacting flows

机译:湍流气液反应流的双k-ε和多δpdf模型

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摘要

The gas-liquid reacting two-phase flow a gaseous SF_6 jet submerged in liquid metal Li is numerically simulated by a two-fluid model. To describe the changes of the flow pattern in the two-phase flow a double-k-ε two-phase turbulence model is developed and adopted. A Multi-δ-pdf model is proposed and applied to simulate the turbulent combustion of gaseous SF_6 with liquid metal Li. The gas and liquid Velocities, void fraction, shape of the penetrating region (the region containing the gas phase) and the mixture fraction related to gas Temperature and species concentration are predicted. Comparison with the results using a single-fluid model shows that current predictions Are reasonable in reflecting the influence of velocity slip between the two phases and capable of predicting Li/SF_6 submerged combustion.
机译:通过两流体模型数值模拟了浸入液态金属Li中的气态SF_6射流的气液反应两相流。为了描述两相流中流型的变化,建立并采用了双k-ε两相湍流模型。提出了Multi-δ-pdf模型,并将其应用于模拟液态金属Li气态SF_6的湍流燃烧。预测了气体和液体的速度,空隙率,渗透区域(包含气相的区域)的形状以及与气体温度和物质浓度相关的混合比。与使用单流体模型的结果进行比较表明,当前的预测在反映两相之间的速度滑移的影响方面是合理的,并且能够预测Li / SF_6浸没燃烧。

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