Airflow calibration of a bellmouth inlet for measurement of compressor airflow in turbine-powered propulsion simulators

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  • NASA  status
    (13.33%) (3 Votes)
    Views: (1558)   Date: (Nov 1, 1985)   Pages: ()
  • Author:  Smith  S. C.  

  • Abstract:  The development of turbine-powered propulsion simulators for high-speed wind tunnel models requires a bellmouth inlet which can accurately measure compressor-inlet airflow. A bellmouth inlet was instrumented with total pressure probes, static pressure probes, and thermocouples for airflow measurement. The bellmouth flowmeter against a critical venturi flowmeter was calibrated. The calibration was done at four inlet pressures ranging from 58 to 114 kPa. The bellmouth discharge coefficient varied as a function of bellmouth-throat Mach number. Over the range of Reynolds number and Mach number tested the Reynolds number was not a significant influence on the discharge coefficient. The overall accuracy of the bellmouth inlet as a flowmeter was estimated to be or - 0.5 of the flowmeter reading.

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