AN INVESTIGATION INTO THE PITOT RAKE METHOD OF MEASURING TURBO JET ENGINE THRUST IN FLIGHT

Abstract

Tests were made on Derwent 5 engines installed in Meteor 4 aircraft. Results showed that static tubes must be incorporated in the pitot rake to give absolute thrust measurements; even then, discrepancies of 2% were observed. Errors as high as 6% in the single-pitot method of estimating flight thrust, based on engine test-bed calibrations, were associated with changes in total pressure sampled by the single pitot and in the magnitude of the exit static pressure between calibration and test conditions. With the use of the pitot static rake to calibrate the single pitot of an installed engine, the flight thrust errors were no larger and possibly smaller. Nondimensional thrusts at 35,000 ft were about 7% lower than corresponding thrusts at 5000 ft.

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Document Details

Document Type
Technical Report
Publication Date
Dec 23, 1952
Accession Number
AD0001837

Entities

People

  • D. W. Bottle
  • J. Stephenson
  • R. T. Shields

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Air Intakes
  • Aircrafts
  • Altitude
  • Boundary Layer
  • Flight Speeds
  • Gages
  • High Altitude
  • Instrumentation
  • Low Altitude
  • Mach Number
  • Measurement
  • Pitot Tubes
  • Pressure Distribution
  • Pressure Gages
  • Pressure Measurement
  • Static Pressure

Readers

  • Aerospace Engineering
  • Fluid Dynamics.