Volume 3, 2012Progress in Flight Physics
|Page(s)||321 - 334|
|Section||Chapter Four. Heat Transfer|
|Published online||29 January 2013|
The tangential gas injection as the means of heat protection of a blunt body streamlined by dusted gas
Central Aerohydrodynamic Institute (TsAGI) Zhukovsky Str. 1, Zhukovsky, Moscow region 140180, Russia
The experimental study of a tangential gas injection influence on the heat flux was carried out. Experiments were conducted in TsAGI wind tunnel at free-stream Mach number M∞ = 6, Reynolds number Re∞,Rw = 0.66 · 106 (calculated on the free-stream flow parameters and bluntness radius of sphere Rw = 37.5 mm), flow stagnation temperature T0 = 573 K, and pressure behind the normal shock ps = 0.5 bar. The mass concentration of solid particles in the flow did not exceed 3%. The cooling gas was injected in the dusted flow through the tangential axissymmetric slot between a flat “cap” and the sphere surface. The blown 2 gas rate was G∗ = Gj /(πρ∞ u∞ Rw) = 0 . . . 0.12. It is shown that to decrease the maximum of heat flux toward the sphere surface in two times, the mass flow rate of coolant G∗ = 0.03 is needed.
© Owned by the authors, published by EDP Sciences, 2012