HEATING OF BODY IN SUPERSONIC HIGH ENTHALPY FLOW AT HIGH PRESSURES.

Research Project

Project/Area Number	06651072
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Aerospace engineering
Research Institution	AICHI INSTITUTE OF TECHNOLOGY (A.I.T)
Principal Investigator	YASUHARA Michiru Aichi Institute of Technology, MECHANICAL ENGINEERING,PROFESSOR, 工学部・機械工学科, 教授 (50022992)
Co-Investigator(Kenkyū-buntansha)	MIZUTANI Mitsuru Aichi Institute of Technology, MECHANICAL ENGINEERING,INSTRUCTOR, 工学部・機械工学科, 講師 (40148234)
Project Period (FY)	1994 – 1995
Project Status	Completed (Fiscal Year 1995)
Budget Amount *help	¥2,100,000 (Direct Cost: ¥2,100,000) Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000) Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywords	HIG ENTHALPY / PLASMA TUNNEL / AERODYNAMIC HEATING / ARC HEATER / 高エンアルピ風洞 / 高温流 / 放電加熱 / アーク加熱
Research Abstract	A HUELS-TYPE ARC HEATING WIND TUNNEL OF MACH NUMBER 4 IS CONSTRUCTED,USING 30kW DIRECT CURRENT POWER SOURCE,ARC HEATER,TANK WITH 1 m DIAMETER 2 m LENGTH,AND 2 VACUUM PUMPS.CONTINUOUS 25 min OF RUNNING TIMES ARE REALIZED USING ARGON OR NITROGEN AS WORKING GASES,SUCCESSFULLY. TO STUDY BASIC CHARACTERISTICS AND PERFORMANCE OF THIS ARC HEATER,MASS FLOW RATE m^^・ gr/sec IS CHANGED AND CORRESPONDING VOLTAGE V volt AND STAGNATION PRESSURE P_0 MPa OF THE HEATED GAS,ARE MESURED AT SEVERAL FIXED DISCHARGE CURRENT I ampere. AT THE SAME TIME,ALSO P_0 IS MEASURED AS A FUNCTION OF m^^・ WHEN THERE IS NO DISCHARGE CURRENT (I=0). FROM THESE MEASURED RESULTS,SEVERAL CHARACTERISTIC BEHAVIORS OF ARC HEATERS ARE DEDUCED. FIRST,A METHOD IS PROPOSED TO ESTIMATE AVERAGE TEMPERATURE OF HEATED GAS.NEXT IT IS FOUND,WITHIN PRESENT EXPERIMENTAL RANGE,THAT I^2/m^^・ IS APPROXIMATELY,A FUNCTION OF V/I ( R=AVERAGE ELECTRIC DISCHARGE RESISTANCE). AND THIS FUNCTIONAL RELATION,WITHIN PRESENT EXPERIMENTAL RANGE,GIVES I^2/m^^・*R^<-alpha>. IN ADDITION IT IS FOUND THAT DATA,TAKEN FROM ANOTHER JAPANESE AND GERMAN INSTITUTES AND UNIVERSITIES HAVING 10 TIMES OR MORE LARGER ARC HEATERS,FOLLOW ALSO THE ABOVE FUNCTIONAL RELATION APPROXIMATELY.IF THIS FUNCTIONAL RELATION IS PROVED FOR WIDE RANGE OF PARAMETERS,A SIMILARITY LAW MAY BE ESTABLISHED,WHICH IS VERY USEFUL IN DESIGNING AND CONSTRUCTING LARGE SCALE,HIGH PERFORMANCE FACILITIES.