Time-Varying Entry Heating Profile Replication with a Rotating Arc Jet Test Article

Grinstead, Jay H ; Venkatapathy, Ethiraj ; Noyes, Eric A ; Mach, Jeffrey J ; Empey, Daniel Martin ; Prabhu, Dinesh K ; White, Todd Richard

关键词: AERODYNAMIC HEATING;    ATMOSPHERIC ENTRY;    CYLINDRICAL BODIES;    HEAT FLUX;    SPATIAL DISTRIBUTION;    STEPPING MOTORS;    TEMPORAL DISTRIBUTION;    VARIATIONS;    TIME;    ROTATION;   

RP-ID  :  ARC-E-DAA-TN15178

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来源: NASA Technical Reports Server

【 摘 要 】

A new approach to arc jet testing that replicates the time-varying conditions of atmospheric entry heating was demonstrated. The concept relies on the spatial variation of heat flux and pressure around a cylindrical test article. The spatial variation is transformed to a temporal variation at one location by rotating the test article during exposure to the arc jet stream. The test article rotation mechanism is based on a programmable stepper motor. An entry heat flux profile was mapped to the cylinders heat flux distribution to determine the rotation angle vs. time executed by the mechanism. A series of arc jet tests with instrumented cylindrical TPS test articles was conducted to prove the concept.