粘性湍流湿蒸汽流中各种凝结过程的统一CFD方法

A. Liberson, S. Hesler
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引用次数: 3

摘要

提出了具有各种凝结现象的粘性湍流湿蒸汽流动的一类准线性数学模型,并进行了计算。这些模型可用于分析平衡凝聚、均相(自发)凝聚、外源粒子上的非均相凝聚和带电分散相在静电场中运动的凝聚。统一模型由两相粘性紊流的气体动力学方程耦合系统表示,动力学方程和电动力学方程描述了尺寸和电荷生长的组合过程,电磁场方程描述了一个电场,其中部分描述了运动电簇的自感。数值过程是时间推进的、单调的、隐式的、以空间和时间坐标为二阶精度的,具有高分辨率的冲击捕获能力。用该方法进行的粘性流场计算表明,剪切边界层和尾迹对凝结有重要影响。预测了冷却速率、液滴半径和整体流参数的分布。根据已知的实验数据对代码进行了验证。
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A Unified CFD Based Approach to a Variety of Condensation Processes in a Viscous Turbulent Wet Steam Flow
A family of quasi linear mathematical models is presented and calculations made for viscous turbulent wet steam flow with a variety of condensation phenomena. These models can be applied to the analysis of equilibrium condensation, homogeneous (spontaneous) condensation, heterogeneous condensation on extraneous particles, and condensation of charged dispersed phase moving in an electrostatic field. The unified model is represented by coupled systems of gas dynamic equations for viscous turbulent two-phase flow, kinetic and electro-kinetic equations tracing out combined processes of size and charge growth, and electromagnetic field equations described an electric field with an account of self-induced in-part by a moving electrical cluster. The numerical procedure is time marching, monotone, implicit, of second order accuracy by space and time coordinates, and exhibits high resolution shock capturing ability. Viscous flow field calculations made with this procedure reveal significant influence on condensation by the shear boundary layers and wakes. Distributions of cooling rate, droplet radius and parameters of the bulk flow are predicted. Verification of the codes against known experimental data is presented.
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