Decoupled Bellmouth - An Alternate Method of Measuring Thrust in the Sea Level Test Cell

Abstract

This report evaluates an alternate method of measuring thrust in the sea level test cell. The method does not require a test cell thrust correction factor which is generally used with the conventional engine installation. In the decoupled bellmouth technique, the bellmouth is isolated from the thrust measuring system, and the inlet momentum is computed from the pressure measurements in the inlet duct. A TF34 engine was tested at an outdoor test site and in a test cell using both thrust accounting methods. Test results show the decoupled bellmouth method worked very well. The method can be used in any test cell or an outdoor site and should be considered as a good alternative to test cell correlations. Keywords: Thrust Measurements; Decoupled Bellmouth; Test Cell; Correlation; Turbofan Thrust Correction; Turbojet.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1986
Accession Number
ADA175616

Entities

People

  • Roman Deineka

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accounting
  • Accuracy
  • Barometric Pressure
  • Boundary Layer
  • Exhaust Gases
  • Exhaust Nozzles
  • High Bypass Turbofans
  • Instrumentation
  • Measurement
  • Pressure Measurement
  • Sea Level
  • Static Pressure
  • Test And Evaluation
  • Test Equipment
  • Test Facilities
  • Test Stands
  • Turbofan Engines

Readers

  • Aerospace Engineering
  • Aerospace Test and Evaluation
  • Computational Fluid Dynamics (CFD)