Stereoscopic PIV measurements of a turbulent compressible mixing layer for CFD validation

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the present study, a two-stream compressible mixing layer with convective Mach number (Mc) of 0.53 is investigated with stereoscopic particle image velocimetry (SPIV) and additional flow diagnostic techniques. The experiment is performed in a blowdown supersonic wind tunnel facility with a primary stream Mach number of 1.57 and secondary stream Mach number of 0.33. The two streams and their boundary layers, initially separated by a splitter plate, begin mixing at the splitter tip. SPIV measurements are taken on the spanwise central plane from the onset of mixing to past shear layer fully-developed conditions. Instantaneous images are processed to produce mean three-component velocity vector fields and ensemble-averaged turbulence statistics. Flow visualization results show that, at this convective Mach number, there are no clear two-dimensional roller structures that are present at lower convective Mach numbers. Instead, the turbulent structures appear more random and three-dimensional. Mean streamwise velocity and Reynolds stress profiles exhibit self similarity in the fully developed region. Velocity measurements show that the normalized growth rate value falls in line with the trend of previous experimental data versus Mc. In addition, streamwise, transverse, and spanwise normal Reynolds stresses (RexxReyyRezz) as well as the primary shear stress (Rexy) peak values are all close to previously documented values near Mc = 0.53. Rexx has the highest stress magnitude, followed by RezzReyyand Rexy.

Original languageEnglish (US)
Title of host publication47th AIAA Fluid Dynamics Conference, 2017
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105005
DOIs
StatePublished - 2017
Event47th AIAA Fluid Dynamics Conference, 2017 - Denver, United States
Duration: Jun 5 2017Jun 9 2017

Publication series

Name47th AIAA Fluid Dynamics Conference, 2017

Other

Other47th AIAA Fluid Dynamics Conference, 2017
CountryUnited States
CityDenver
Period6/5/176/9/17

ASJC Scopus subject areas

  • Aerospace Engineering
  • Engineering (miscellaneous)

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