Visualization of vortex generator jets for conical diffuser separation control using PIV

Yonghui Xie; Tao Fan; Di Zhang

doi:10.1117/12.839082

24 August 2009 Visualization of vortex generator jets for conical diffuser separation control using PIV

Yonghui Xie, Tao Fan, Di Zhang

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737521 (2009) https://doi.org/10.1117/12.839082
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Vortex generator jets (VGJs) have been recognized as an effective active control method for the flow separation. To investigate its mechanism in conical diffuser, PIV was used to study the interaction of VGJs with freestream in this study. A conical diffuser model, with divergence angle of 14° was used. The jet holes were drilled with pitch angle of 30° and skew angle of 90°. At several streamwise locations, two-dimensional traverses were set up to obtain the velocity distribution and vorticity in the interaction region of vortex. PIV measurements provide a global depiction of the interaction of boundary layer transition and separation in this unsteady environment. It is shown that vortical flows generated by VGJs significantly fluctuate velocity profiles. The steady jets create vortices that swept the low momentum fluid up from the boundary layer while transporting high momentum freestream fluid towards the wall, which provides the ingredients for flow control. It is also revealed that the longitudinal vortices are generated in the boundary layer by shear stress and friction from jets, which increase cross-stream mixing of streamwise momentum and then suppress separation in conical diffuser. Some new phenomena and rules presented would offer valuable information for further study.

Citation Download Citation

Yonghui Xie, Tao Fan, and Di Zhang "Visualization of vortex generator jets for conical diffuser separation control using PIV", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737521 (24 August 2009); https://doi.org/10.1117/12.839082

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available