HEAT-TRANSFER ON BLUNT CONES IN NONUNIFORM SUPERSONIC-FLOW WITH INJECTION FROM THE SURFACE

The laminar flow and heat transfer parameters of spherically blunted c ones are calculated on the basis of the complete viscous shock layer e quations. A nonuniform (wake-type) supersonic impingent flow and gas i njection from the surface are investigated. The given numerical soluti on is compared with other numerical and asymptotic solutions. It is sh own that the injection efficiency at the critical point for heat-flux reduction can be significantly improved by using a nonuniform impingen t flow. It is established that heat flux and friction on the lateral p art of the cone increase with the taper, whether the surface is permea ble or impermeable. The reduction of friction and heat flux does not d epend on the taper, but is determined by the mass flow of injected gas , measured from the critical point to the sensing point. It is shown t hat the heat flux distribution in localized injection behaves nonmonot onically. As the Reynolds number increases, the efficiency of localize d injection increases substantially as a result of the heat flux reduc tion in the vicinity of the critical point. After the injection termin ation point, weaker ''veil'' cooling of the surface takes place at Re( infinity) = 10(4) than at Re(infinity) = 10(2).