Compressible, turbulent mixing layers have been investigated experimentally using pressure measurements, schlieren photographs, and velocity measurements with a two-component laser Doppler velocimeter system. Seven mixing-layer cases were examined, with relative Mach numbers ranging from 0.40 to 1.97, which spans the region of significant compressibility effects. Both the spatial development and similarity of the mixing layers were considered. The development of the mixing layers required a Reynolds number (based on the freestream velocity difference and local mixing-layer thickness) on the order of 1 × 105. In the fully developed regions of the mixing layers, it was found that transverse turbulence intensities and normalized kinematic Reynolds stresses decreased with increasing relative Mach number, whereas the streamwise turbulence intensities and kinematic Reynolds stress correlation coefficients remained relatively constant.
ASJC Scopus subject areas
- Aerospace Engineering