The interaction of super-/hypersonic flow with gas injection from blunt body has been attracting much interest among engineers, related not only to the ablating flow from reentry capsule heat shields but also to the improvement of aerodynamic characteristics. If such simulation becomes feasible in expansion tubes under such high-enthalpy conditions, the usefulness of the device would be come much improved. The purpose of this study is to develop an experimental system for high-enthalpy flow experiments with accompanying gas injection and to validate the effectiveness of the system. An experimental study was conducted to develop a system for superorbital high-enthalpy flow simulation with gas injection. The expansion tube X-2 was used as the base facility. The synchronization of the gas injection to the expansion tube operation and the effect of the gas injection on the high-enthalpy flow generation performance are carefully discussed. When hydrogen was injected, the performance of the acceleration tube operation was not degraded, whereas with nitrogen injection the shock speed was significantly decreased. Hypersonic shock layers with gas injection were visualized by the schlieren method. This system is expected to be used as a tool to simulate a hypersonic shock layer with ablation for a reentry capsule.
High-enthalpy expansion tube experiments with gas injection
Simulation der Wechselwirkung zwischen einer Strömung hoher Enthalpie und einem Gasstrahl mit einem Expansionsrohr
AIAA Journal ; 38 , 12 ; 2253-2259
2000
7 Seiten, 12 Bilder, 1 Tabelle, 15 Quellen
Article (Journal)
English
FLUID DYNAMICS - High-Enthalpy Expansion Tube Experiments with Gas Injection
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