Investigation of Radiation-cooled Arc Heater

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During atmospheric entry, a maximun flight Mach number is over 25 and a very strong shock wave is generated ahead of a nose and wings. Air temperature behind such a strong shock wave becomes over 10,000K and as a result nitrogen and oxygen molecules dissociated and ionized. In addition Nitric oxide is also produced due to the combination of dissociated molecules. An arc-heated wind tunnel can be considered as one of ground test facilities to similate the atmospheric entry conditions, that is to say, a high speed flow of dissociated and ionized air. A conventional arc heater is water-cooled but this water cooling system is considerable complex and sometimes an accident of water occurs. Therfore, in the present study, a radiation-cooled arc heated is proposed instead of a water-cooled arc heater. It is the present aim to develop such a radiation-cooled arc heater and to apply it to studies of high-enthalpy flows needed for the reeentry aerodynamic heating experimentsThe following items have been done in 1997 :(1) perforamnce test of a arc-heated wind tunnel・arc current-arc voltage characteristics・test gas flow rate-arc current characteristics・arc current-stagnation enthalpy characteristics(2) thermal characterics test・stagnation heat flux measurements・estimation of stagnation enthalpy・estimation of heating efficiency