Velocity-Field Measurements of an Axisymmetric Separated Flow Subjected to Amplitude-Modulated Excitation

Trosin, Barry James

ISBN 10: 1289147612 / ISBN 13: 9781289147617

Published by Bibliogov, 2013

About this Item

pp. 114.

Seller Inventory # 26386185896

Bibliographic Details

• Title: Velocity-Field Measurements of an Axisymmetric Separated Flow Subjected to Amplitude-Modulated Excitation
• Publisher: Bibliogov
• Publication Date: 2013
• Language: English
• ISBN 10: 1289147612
• ISBN 13: 9781289147617
• Binding: Soft cover
• Condition: New

About this title

Synopsis

Active flow control was applied at the point of separation of an axisymmetric, backward-facing-step flow. The control was implemented by employing a Helmholtz resonator that was externally driven by an amplitude-modulated, acoustic disturbance from a speaker located upstream of the wind tunnel. The velocity field of the separating/reattaching flow region downstream of the step was characterized using hotwire velocity measurements with and without flow control. Conventional statistics of the data reveal that the separating/reattaching flow is affected by the imposed forcing. Triple decomposition along with conditional averaging was used to distinguish periodic disturbances from random turbulence in the fluctuating velocity component. A significant outcome of the present study is that it demonstrates that amplitude-modulated forcing of the separated flow alters the flow in the same manner as the more conventional method of periodic excitation.