A turbulent, compressible mixing layer with a relative Mach number of 1.59 has been investigated experimentally using a two-component laser Doppler velocimeter system. Two sets of profiles were obtained at each streamwise measurement location to compile the stream wise, transverse, and spanwise turbulence statistics. Results from the fully developed region of the mixing layer showed similar peak values of streamwise and spanwise turbulence intensities along with reduced peak values of transverse turbulence intensity, normalized primary Reynolds shear stress, and normalized turbulent kinetic energy in comparison to the respective quantities from incompressible shear layers. Because the Reynolds normal stress ratio σv/σwwas found to decrease with increasing relative Mach number, it is concluded that the spanwise component of the mixing layer turbulence becomes more important as compressibility is increased. In addition, various turbulence profiles demonstrated a reduction of lateral extent on the high speed side of the mixing layer as compared to profiles in incompressible mixing layers.
ASJC Scopus subject areas
- Aerospace Engineering