Simulation to Sudden2Expansion Two2Phase Flows with Two2Scale Second2Order Moment Particle Turbulence Model

doi:10.7652/xjtuxb200601023

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Simulation to Sudden2Expansion Two2Phase Flows with Two2Scale Second2Order Moment Particle Turbulence Model

更新时间：2025-07-09

- Simulation to Sudden2Expansion Two2Phase Flows with Two2Scale Second2Order Moment Particle Turbulence Model
- Vol. 40, Issue 1, Pages: 97-0100(2006)
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- DOI：10.7652/xjtuxb200601023
  CLC： O359
- Online First：10 January 2006，
  
  Published：2006
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Simulation to Sudden2Expansion Two2Phase Flows with Two2Scale Second2Order Moment Particle Turbulence Model[J]. 2006, 40(1): 97-0100.
DOI：

Simulation to Sudden2Expansion Two2Phase Flows with Two2Scale Second2Order Moment Particle Turbulence Model[J]. 2006, 40(1): 97-0100. DOI： 10.7652/xjtuxb200601023.

摘要

基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念

应用 单相流动多尺度湍流模型方法

从双流体模型出发

推导和封闭了颗粒的双尺度脉动雷诺应力方 程、大尺度脉动能量传递率方程、小尺度脉动耗散率方程和两相脉动关联方程

用统一的湍流模型 方法构造了包含颗粒两类脉动的新的颗粒双尺度二阶矩两相湍流模型. 用该模型对突扩管内的两 相流动进行了数值模拟

并和单尺度的二阶矩两相湍流模型进行了比较

计算结果和实验数据吻合 较好

比单尺度的二阶矩两相湍流模型的计算结果有所改进.

Abstract

A two2scale second2order moment particle t urbulence model accounting for inter2 particle collision is developed based on the concept t hat the particle fluct uation can be divided into large2scale one due to t urbulence and small2scale one due to collision with a unified t reatment . Adopting the multiple scale of single2fluid met hod and two2fluid model

t he particle Reynolds st ress equation for two2scale fluct uation

t he energy t ransfer rate equation for large2scale fluct uation

t he turbulent kinetic energy dissipation rate equation for small2scale fluct uation

and t he gas2particle velocity correlation equation for two2scale fluct uation are all derived and closed. The presented model is employed to simulate gas2particle flows in a sudden2expansion chamber

and the simulated result s coincide well wit h t he experimental ones. It is al so demonst rated t hat t he presented two2scale model is wit h higher calculating accuracy

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