Effect of vortex flows at surface with hollow-type relief on heat transfer coefficients and equilibrium temperature in supersonic flow

• Published in: Experimental thermal and fluid science 2002-07, Vol.26 (5), p.487-497
• Main Authors: Leontiev, A.I, Vinogradov, Yu.A, Bednov, S.M, Golikov, A.N, Yermolaev, I.K, Dilevskaya, E.V, Strongin, M.M
• Format: Article
• Language: English
• Subjects: Distribution of heat transfer coefficient; Flow visualization; Heat transfer coefficients; Recovery coefficient; Shock waves; Spherical hollows; Supersonic flow; Temperature fields; Thermography; Thermography (temperature measurement); Turbulent boundary layer; Vortex flow; Vortex nature of heat exchange
• ISSN: 0894-1777; 1879-2286
• DOI: 10.1016/S0894-1777(02)00157-7

This paper deals with the results of experimental investigation of supersonic flow stream lining of the surface, which has relief looking as series of spherical hollows. Using thermography method the temperature fields on the surface are obtained at Mach numbers of the flow between 2 and 3. The study of these fields at unsteady conditions allows obtaining distributions of local coefficients of heat transfer. The coefficients of equilibrium temperature in different surface regions are determined by temperature fields. It is shown that the availability of spherical hollows relief on the surface not only intensifies heat transfer but also leads to decrease of recovery equilibrium temperature coefficients. The structure of the flow at flow along of the surface with series of hollows relief is studied by visualization. The nature of shadgraph indicates vortexes outgoing from hollows to flow core.