Effects of comressibility on lhe structure of free shear layers

M. Samimy, G. S. Elliott

Research output: Contribution to conferencePaperpeer-review


A planar two-dimensional constant pressure compressible shear layer was formed by mixing of a supersonic flow and a subsonic flow at the trailing edge of a 0.5 mm thick splitter plate. Two cases were investigated. The supersonic, subsonic, and the convective Mach numbers were 1.8, 0.51, and 0.51 for case 1, and 1.96, 0.37, and 0.64 for case 2, respectively. A two-component coincident LDV system was utilized to obtain detailed mean and turbulence data. The growth rate ratio of case 2 to the incompressible counterpart was approximately 20% less than that of the case 1. Preliminary results seem to indicate that as the convective Macn number increases, the lateral extent and/or coherency of large scale structures in the supersonic side of the shear layer drop. This limits the lateral transport of kinetic energy and also the entrainment of the flow from supersonic side which in turn decreases the growth rate.

Original languageEnglish (US)
StatePublished - 1988
Externally publishedYes
EventAIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference, 1988 - Boston, United States
Duration: Jul 11 1988Jul 13 1988


ConferenceAIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference, 1988
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Control and Systems Engineering


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