Analysis and Measurement of Unsteady Flow in Curved Pipes

弯曲管道非定常流动分析与测量

• 批准号: 61550130
• 负责人: SUDOU Kouzou
• 金额: $ 1.34万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550130/
• 关键词: Curved Pipe; Bend; Turbulent Flow; Oscillatory Flow; Flow Pattern; Velocity Measurement; Flow Visualization; 乱流モデル; 流体力学; 曲り管内流れ; 流れの可視化

(1) Three components of mean velocity have been measured in a square sectioned 90 degree bend of radius ratio 2.0 with upstream and downstream straight ducts under Reynolds number 40000. The bias of the axial flow and the intensity of the secondary flow were investigated from the upstream of the bend to the downstream.(2) A Reynolds stress model is applied to a fully-developed turbulent flow in a curved circular pipe. Numerical results are compared with the authors' experimental data. Computed velocity is in moderate agreement with the experimental results over the cross section.(3) Visualization was made of the secondary flow in the fullydeveloped region of a curved pipe under oscillatory laminar flow conditions; Womersley number 5.5 to 28 and oscillatory Dean number 40 to 500. The flow pattern, the velocity profile and the vortex center of the secondary flow were made clear.

(1)在雷诺数为40000的条件下，测量了半径比为2.0的90 °方形弯曲管道上、下游直管段内的三个平均速度分量。研究了从弯曲上游到下游的轴向流偏差和二次流强度。(2)本文采用雷诺应力模型，对圆管内充分发展的紊流进行了数值模拟。数值结果与作者的实验数据进行了比较。计算的速度是在中等协议与实验结果的横截面。(3)在振荡层流条件下（沃默斯利数5.5 ~ 28，迪恩数40 ~ 500），对弯管充分发展区的二次流进行了可视化。得到了二次流的流态、速度分布和涡心位置。

项目成果

須藤浩三: 日本機械学会.

Kozo Sudo：日本机械工程师学会。

須藤浩三: 日本機械学会論文集(B編). 53. 2272-2280 (1987)

Kozo Sudo：日本机械工程师学会会议记录（B 版）53. 2272-2280 (1987)。

Kouzou SUDOU: "Numeical Analysis of Turbulent Flow in a Curved Pipe by Reynolds StressModel" Trans. JSME.

Kouzou SUDOU：“通过雷诺应力模型对弯曲管道中的湍流进行数值分析” Trans。

Kouzou SUDOU: "Turbulent Flow in a Square Sectioned 90 degree Bend (lst Report)" Trans. JSME.

Kouzou SUDOU：“方形截面 90 度弯曲处的湍流（第一份报告）” Trans。

角田勝: 日本機械学会論文集.

Masaru Tsunoda：日本机械工程师学会会议录。