Fundamental Study of a Jet-in-Cross-Flow Interacting with a Vortex Generator for Film Cooling Applications

Author: Rigby, David
Published: September 29, 2009.
Physical Description: 1 electronic document
Additional Creators: Heidmann, James and Zaman, Khairul

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Summary

Results of an experimental study are presented on the effectiveness of a vortex generator (VG) in preventing lift-off of a jet-in-cross-flow (JICF). The study is pertinent to film-cooling applications and its relevance to NASA programs is first briefly discussed. In the experiment, the jet issues into the boundary layer at an angle of 20deg to the free-stream. The effect of a triangular, ramp-shaped VG is studied while varying its geometry and location. Detailed flow-field properties are obtained for a case in which the height of the VG and the diameter of the orifice are comparable to the approach boundary layer thickness. The VG produces a streamwise vortex pair with vorticity magnitude three times larger (and of opposite sense) than that found in the JICF alone. Such a VG appears to be most effective in keeping the jet attached to the wall. The effect of parametric variation is studied mostly from surveys ten diameters downstream from the orifice. Results over a range of jet-to-freestream momentum flux ratio (1

Other Subject(s)

Aeronautics (General)

Collection

NASA Technical Reports Server (NTRS) Collection.

Note

Document ID: 20100042247.
E-17584.
NASA's Fundamental Aeronautics 2009 Technical Conference: Subsonic Fixed Wing Project; 29 Sep. - 1 Oct. 2009; Atlanta, GA; United States.

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