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首页> 外文期刊>International Journal of Heat and Fluid Flow >Viscous and unsteady flow calculations of condensing steam in nozzles
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Viscous and unsteady flow calculations of condensing steam in nozzles

机译：喷嘴中冷凝蒸汽的粘性和非恒定流计算

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The paper presents two-dimensional calculations for spontaneously nucleating flows of steam in converging-diverging nozzles. The Reynolds-averaged Navier-Stokes equations are solved for the two-phase mixture, using a Jameson-style finite volume method on an unstructured and adaptive triangular mesh. Results are first presented for steady, viscous flow, showing the influence of boundary layer growth on streamwise pressure distributions and droplet sizes. These results have implications for the interpretation of some of the experimental data used for validating the theories of nucleation and droplet growth. The numerical scheme has also been applied to compute unsteady flows in a variety of nozzle geometries, covering a range of inlet conditions in each case. Asymmetric oscillation modes, previously observed in moist air, have been predicted for one of the geometries, indicating for the first time that such oscillations are possible in pure steam.
机译：本文提出了二维计算，用于收敛-发散喷嘴中的蒸汽自发成核流。使用詹姆森式有限体积方法在非结构化和自适应三角网格上求解两相混合物的雷诺平均Navier-Stokes方程。首先给出了稳定，粘性流动的结果，显示了边界层生长对流向压力分布和液滴尺寸的影响。这些结果对用于验证成核和液滴生长理论的一些实验数据的解释具有启示意义。数值方案也已应用于计算各种喷嘴几何形状中的非恒定流量，每种情况下都覆盖一定范围的入口条件。对于一种几何形状，已经预测了先前在潮湿空气中观察到的不对称振荡模式，这首次表明在纯蒸汽中这种振荡是可能的。

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