径向离心泵内两相非混相液/气流动输运分析的研究现状——C部分:CFD方法与改进模型的重点

IF 1.3 Q2 ENGINEERING, AEROSPACE
Markus Hundshagen, R. Skoda
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引用次数: 3

摘要

预测泵的性能并确保两相条件下的运行可靠性是液体/气体径向离心泵流动的三维(3D)计算流体动力学(CFD)分析的主要目标。因此,三维CFD方法在学术界和工业界越来越多地应用于此类流动。液体/气体泵流的CFD分析需要从CFD的几个领域仔细选择子模型,如两相和湍流建模,以及复杂几何形状的高质量网格划分。本文概述了当前CFD模拟策略,并概述了两相建模的最新进展。特别关注分散气泡流和相干气藏的不同方法。对于分散气泡流动区域,讨论了欧拉-欧拉双流体模型,包括种群平衡和气泡相互作用模型。对于相干气袋流,基本上采用了界面捕获流体体积的方法。提出了一种混合模型,即具有界面捕获特性的欧拉-欧拉双流体模型的组合,预测气泡流动状态以及具有相干气穴的状态。强调了在高度非定常两相流区域考虑尺度分辨湍流模型的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models
Predicting pump performance and ensuring operational reliability under two-phase conditions is a major goal of three-dimensional (3D) computational fluid dynamics (CFD) analysis of liquid/gas radial centrifugal pump flows. Hence, 3D CFD methods are increasingly applied to such flows in academia and industry. The CFD analysis of liquid/gas pump flows demands careful selection of sub-models from several fields in CFD, such as two-phase and turbulence modeling, as well as high-quality meshing of complex geometries. This paper presents an overview of current CFD simulation strategies, and recent progress in two-phase modeling is outlined. Particular focus is given to different approaches for dispersed bubbly flow and coherent gas accumulations. For dispersed bubbly flow regions, Euler–Euler Two-Fluid models are discussed, including population balance and bubble interaction models. For coherent gas pocket flow, essentially interface-capturing Volume-of-Fluid methods are applied. A hybrid model is suggested, i.e., a combination of an Euler–Euler Two-Fluid model with interface-capturing properties, predicting bubbly flow regimes as well as regimes with coherent gas pockets. The importance of considering scale-resolving turbulence models for highly-unsteady two-phase flow regions is emphasized.
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来源期刊
CiteScore
2.30
自引率
21.40%
发文量
29
审稿时长
11 weeks
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