Unable to log in or get member pricing? Having trouble changing your password?

Please review our Frequently Asked Questions for complete information on these and other common situations.
 

Vertical Flight Library & Store

Compressible Dynamic Stall Alleviation Through High Momentum Blowing

Peter Lorber, Charles Berezin, Mark Scott, Sikorsky Aircraft
Kyle Hird, Matthew Frankhouser, Bons Jeffrey, James Gregory, Ohio State University
Patrick Bowles, United Technologies Research Center

May 17, 2016

https://doi.org/10.4050/F-0072-2016-11375

Abstract:
An experiment was conducted in The Ohio State University Transonic Wind Tunnel on a high lift airfoil to evaluate the effectiveness of high momentum steady blowing for dynamic stall control. Computational fluid dynamics (CFD) was used to design airfoil modifications to tangentially inject air behind the leading edge. Extensive design, calibration, and post-test analysis efforts were required to achieve desired flow control system performance and data accuracy. Aerodynamic performance for steady and oscillatory angle-of-attack conditions was measured with the baseline smooth airfoil, with the slot open but no blowing, and with blowing at moderate to high momentum coefficients. The blow-down wind tunnel was operated at Mach numbers between 0.2 to 0.7 and at near full scale Reynolds numbers. High momentum blowing at each Mach number substantially increased airfoil performance, including a 20% increase in maximum lift coefficient for steady conditions at Mach 0.3. For unsteady pitching motions, blowing produced a cycle- averaged lift increase of more than 20% at Mach 0.3 to 0.4. Large reductions in peak adverse pitching moment were also measured in deep dynamic stall. Inadvertently, the experiment incorporated several data points in which suction occurred. These cases also enhanced performance, although to a lesser extent.


Compressible Dynamic Stall Alleviation Through High Momentum Blowing

  • Presented at Forum 72
  • 20 pages
  • SKU # : F-0072-2016-11375
  • Aerodynamics

  • Your Price : $30.00
  • Join or log in to receive the member price of $15.00!


VFS member?
Don't add this to your cart just yet!
Be sure to log in first to receive the member price of $15.00!

 
Add To Cart

Reward Value:
(60) Member Points

Compressible Dynamic Stall Alleviation Through High Momentum Blowing

Authors / Details:
Peter Lorber, Charles Berezin, Mark Scott, Sikorsky Aircraft
Kyle Hird, Matthew Frankhouser, Bons Jeffrey, James Gregory, Ohio State University
Patrick Bowles, United Technologies Research Center