P.A. Polivanov , Yu.V. Gromyko  , D.A. Bountin  , A.A. Maslov

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_1480920

Laminar-turbulent transition on the blunt leading edge generated by roughness can lead to a sharp growth of heat fluxes on the surface of hypersonic vehicles. Experimental study of the roughness was performed in the T-327b and “Transit – M” wind tunnels on a conical model at two Mach numbers M = 5, 6 at wide range of the Reynolds number Re1 = 3-68 106 1/m and radius of bluntness R=2- 9 mm. Three types of roughness were considered: distributed, isolated, and combination of two single roughness. Nonstationary measurements of pressure pulsations on the model surface, mass flow rate and measurement of heat fluxes were performed. In the study the effect of roughness on the turbulization of the boundary layer dependence on Reynolds number was found. The effect of the roughness geometry on the laminar-turbulent transition was studied. Data analysis showed the main features of the flow around the roughness.

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In Categories: High-Speed Aerodynamics and Aerothermodynamics, HiSST 2018, Hypersonic Aerodynamics, Materials and Structures
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