This paper detailed the procedure used to design equivalent test conditions that will be used to study how a test gas substitution of He for the heavier Ne affects the spectral radiation measured for gas giant entry testing performed using the substitution. Results from an equilibrium analysis of the X2 expansion tube fell within the error margins of experimental shock speed and pressure data. CFD gave good agreement for the H_2/He condition, but not the H_2/Ne condition. Investigations are continuing.
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