Accession Number:

ADA175616

Title:

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

Descriptive Note:

Final rept. 1 Oct 1984-30 Sep 1985

Corporate Author:

NAVAL AIR PROPULSION CENTER TRENTON NJ PROPULSION ENGINEERING DEPT

Personal Author(s):

Report Date:

1986-08-01

Pagination or Media Count:

55.0

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.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE