Experimental and Numerical Study of Heat Transfer to Cylindrical Copper Models and HfB2-SiC Ceramic Samples in High-Enthalpy Air Jets Using RF-Plasmatron IPG-4
Heat transfer tests in high-enthalpy supersonic under-expanded air jets were performed using RF-plasmatron IPG-4. Stagnation point heat fluxes to water-cooled copper surface were measured along jet axes using 30-mm diameter models with different nose geometry: flat, hemispherical and hemi-spherical combined with flat stagnation point area. At the same test regimes stagnation pressures were measured using Pitot probe. The behavior of the two ultrahigh-temperature HfB<sub>2</sub>-SiC ceramic samples prepared in Kurnakov Institute of General and Inorganic Chemistry was studied in sub- and supersonic dissociated air jets through step-by-step heating in IPG-4 RF-plasmatron.