Separation Points on Cylinders in Oscillating Flow

振荡流中圆柱体上的分离点

• 批准号: 8714126
• 负责人: Turgut Sarpkaya
• 金额: $ 7.4万
• 依托单位: Naval Postgraduate School
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714126&HistoricalAwards=false
• 关键词: Separation; Points; Cylinders; Oscillating; Flow

The overall objective of this continuing research program is to add to the basic understanding of time-dependent separated flow about bluff bodies. Using an existing U-shaped oscillating flow tunnel and extensive data acquisition system, accurate separation point data will be obtained through the use of smooth and rough cylinders immersed in a sinusoidally oscillating flow. Four methods will be used to determine the separation points as a function of time and flow mode: Differential Pressure Method, Surface Pressure Distribution Method, Flush Hot Film Surface Sensors, and the Dye Injection Method. The data will be compared with those predicted numerically during the course of the prior investigation through the use of the discrete vortex model. The proposed investigation will not only provide the much needed critical comparison but will also help to generalize the vortex methods by removing or reducing some of the assumptions. The interplay between the experimental data and the numerical analysis will enhance our fundamental understanding of time-dependent flow about bluff bodies at Reynolds numbers of practical concern.

该持续研究计划的总体目标是加深对钝体随时间分离流的基本理解。 利用现有的U形振荡流隧道和广泛的数据采集系统，通过使用浸入正弦振荡流中的光滑和粗糙的圆柱体来获得准确的分离点数据。 将使用四种方法来确定作为时间和流量模式的函数的分离点：压差法、表面压力分布法、冲洗热膜表面传感器和染料注射法。 这些数据将与先前调查过程中通过使用离散涡模型进行数值预测的数据进行比较。 拟议的研究不仅将提供急需的关键比较，而且还将通过删除或减少一些假设来帮助推广涡流方法。 实验数据和数值分析之间的相互作用将增强我们对实际关注的雷诺数下钝体随时间流动的基本理解。