Accession Number : AD0623387

Title :   PERFORMANCE IMPROVEMENT OF ARC HEATERS FOR AERODYNAMIC WIND TUNNELS.

Descriptive Note : Final rept. for 15 Apr 64-14 Jun 65,

Corporate Author : UNION CARBIDE CORP INDIANAPOLIS IND LINDE DIV

Personal Author(s) : Eschenbach,Richard C. ; McLeod,James R. ; Stresino,Edward F.

Report Date : AUG 1965

Pagination or Media Count : 97

Abstract : Three avenues for increasing the enthalpy attainable from scalable high performance arc heaters were studied: radiation loss reduction, magnetic control of arc terminations and geometry changes. The radiation loss work showed centerline arc column enthalpies over 30,000 Btu/lb. Because the arc column is optically thin, substantial reduction of radiation loss seems infeasible. Large arc devices will be limited more by radiation than small. Modest improvements in performance were achieved with magnetic interactions, which were found to be extremely complex. Proper proportioning of radial and axial field components was quite important, especially in maintaining scalability. Marked undesirable effects occurred when the auxiliary field coil was located near the electrode gap. Distinct performance improvements were achieved by changes in geometry, with air injection and chamber design the most significant for the low flow, high current region studied. (Author)

Descriptors :   (*WIND TUNNELS, HEATERS), (*HEATERS, ELECTRIC ARCS), (*ENTHALPY, HEATERS), PERFORMANCE(ENGINEERING), AERODYNAMIC CHARACTERISTICS, SCALE, THERMAL RADIATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE