Two-Component Simultaneous LDV (Laser Doppler Velocimeter) Turbulence Measurements in an Axisymmetric Nozzle Afterbody Subsonic Flow Field with a Cold, Underexpanded Supersonic Jet

Two-Component Simultaneous LDV (Laser Doppler Velocimeter) Turbulence Measurements in an Axisymmetric Nozzle Afterbody Subsonic Flow Field with a Cold, Underexpanded Supersonic Jet

A test was conducted to obtain nonintrusive measurements in the flow field about an axisymmetric nozzle afterbody with a cold, underexpanded jet, M sub j=1.563, in a parallel free stream, M sub alpha = 0.6. Reynolds shear stress and two components of mean velocity and turbulence intensity were measu...

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Bibliographische Detailangaben
Hauptverfasser: Heltsley, F L, Crosswy, F L
Format: Report
Sprache:eng
Schlagworte:
AFTERBODIES
AXISYMMETRIC FLOW
FLOW FIELDS
FLOW VISUALIZATION
Fluid Mechanics
JET MIXING FLOW
LASER VELOCIMETERS
LDV(Laser Doppler Velocimeter)
LPN-AEDC-D202PW
SUPERSONIC FLOW
TURBULENT FLOW
WIND TUNNEL TESTS
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Zusammenfassung:A test was conducted to obtain nonintrusive measurements in the flow field about an axisymmetric nozzle afterbody with a cold, underexpanded jet, M sub j=1.563, in a parallel free stream, M sub alpha = 0.6. Reynolds shear stress and two components of mean velocity and turbulence intensity were measured using a two-color Bragg-diffracted laser Doppler velocimeter. Additional experimental data include the afterbody surface pressure distribution and laser vapor screen flow visualization of the jet plume. A multiple seeding technique was used to investigate the bimodal velocity probability distributions observed in the jet mixing region. Prepared in cooperation with Calspan Field Services, Inc., Arnold AFS, TN. AEDC Div.