Direct Numerical Simulation of Turbulent Flow and Heat Transfer in a Square Duct Rotating along Its Spanwise Direction

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Direct Numerical Simulation of Turbulent Flow and Heat Transfer in a Square Duct Rotating along Its Spanwise Direction

更新时间：2025-07-09

- Direct Numerical Simulation of Turbulent Flow and Heat Transfer in a Square Duct Rotating along Its Spanwise Direction
- Vol. 43, Issue 5, Pages: 13-17(2009)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 大连理工大学土木水利学院,大连,116024
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Online First：10 May 2009，
  
  Published：2009
- 稿件说明：
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Direct Numerical Simulation of Turbulent Flow and Heat Transfer in a Square Duct Rotating along Its Spanwise Direction[J]. 2009, 43(5): 13-17.
DOI：

Direct Numerical Simulation of Turbulent Flow and Heat Transfer in a Square Duct Rotating along Its Spanwise Direction[J]. 2009, 43(5): 13-17. DOI：

摘要

对旋转矩形通道内的湍流流动和换热进行了直接数值模拟.非稳态N-S方程的空间离散采用二阶中心差分法

时间推进采用二阶显式Adams-Bashforth格式.分析了旋转对通道截面上主流平均速度、截面流速以及截面平均温度的影响

结果表明:在不考虑离心力的作用时

随旋转数的增大

管道截面的平均速度减小

平均湍动能减小

与静止时相比

旋转数为1.5时平均湍动能减小了33%; 在考虑离心力的影响时

对于径向旋转轴向出流

平均速度增大

平均湍动能增大

而对于径向旋转轴向入流

结果相反.在旋转数为1.5时

与不考虑浮升力相比

对于径向旋转轴向出流

平均湍动能增大了17%

而对于径向旋转轴向入流

平均湍动能减小了43%.

Abstract

Turbulent flow and heat transfer in a square duct rotating along its spanwise direction is investigated by direct numerical simulation. The spatial terms in the governing equations are discretized by second-order central difference scheme and the time terms are discretized by the Adams-Bashforth scheme. The influence of rotation on the streamwise velocity

crosswise velocity and the mean temperature is analyzed. The results show that the mean velocity and the mean turbulent kinetic energy decreases with the increase of rotation number when the centrifugal buoyancy force is neglected. The mean turbulent kinetic energy of Ro

=1.5 decreases by 15 percent compared with that of Ro

=0. If the effect of the centrifugal buoyancy force is taken into account

for the radially outwards flow

the mean velocity and turbulent kinetic

energy increase with rotation number compared with those without the effect of centrifugal force

and the results are converse for the flow radially inwards. It is found that the mean turbulent kinetic energy increases by 17 percent for the radially outwards flow at Ro

=1.5 compared with that of Gr

but it decreases by 43 percent for the flow radially inwards.

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references

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马良栋.矩形截面通道内强化对流换热机理的研究及湍流换热的高级数值模拟[D].西安:西安交通大学能源与动力工程学院,2007.

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