Accession Number : AD0288668

Title :   MEASUREMENTS OF PRESSURE AND SPEED OF FLOW IN A SPARK-HEATED HYPERSONIC WIND TUNNEL

Corporate Author : STANFORD UNIV CALIF

Personal Author(s) : KARAMCHETI,KRISHNAMURTY ; VALI,WALTER

Report Date : NOV 1962

Pagination or Media Count : 1

Abstract : The nature of the flow and state of the gas in the nozzle and test section of the Stanford spark-heated hypersonic wind tunnel was studied. Attention is given only to the pressure and speed-of-flow measurements. Results are presented for pitot pressures and wall static pressures. The speed of flow in the test section is derived from measurements made by spark-schlieren photographs of a disturbance created in the flow by means of a spark discharge. On the basis of these measurements, it is concluded that the actual stagnation enthalpy of the stream is likely to be different from the enthalpy calculated according to current practice. As a consequence, it is shown that serious errors may occur in the calculated values for the state of the flow, and in theoretical estimates of quantities such as stagnation-point heat-transfer rates. (Author)

Descriptors :   *HYPERSONIC WIND TUNNELS, *WIND TUNNEL NOZZLES, ANALYSIS, ELECTRIC ARCS, ENTHALPY, ERRORS, HEAT TRANSFER, HYPERSONIC NOZZLES, MEASUREMENT, PITOT TUBES, PRESSURE, SCHLIEREN PHOTOGRAPHY, VELOCITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE