NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Turbulence characteristics of compressor discharge flowsTurbulence measurements were conducted in a large gas turbine engine (JT9D) at the entrance to the diffuser duct, joining the compressor discharge to the combustor inlet. Hot film probe and hot wire probe measurements were obtained at temperatures from 450K (350F) (idle) to 608K (635F) (rich approach). At I.D. (25 percent span) and mid-span locations, the turbulence intensity increased slightly from 6 + or - percent at idle condition to 7 or - 1 percent at rich approach. At O.D. (75 percent span) the turbulent intensity increased more rapidly, from 7.5 + or - 0.5 percent at idle to 15 + or - 0.5 percent at rich approach. The spectra showed turbulent energy distributed uniformly over a 0.1 to 5 KHz bandwidth (down 3db) at all operating conditions, corresponding to random turbulence with velocity wave lengths of 2 cm to 1 meter travelling at the mean velocity of 100 m/sec. Tests results are given in tables and graphs.
Document ID
19790016824
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Grant, H. P.
(Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Publication Information
Publication: NASA. Lewis Res. Center Premixed Prevaporized Combustor Technol. Forum
Subject Category
Aircraft Propulsion And Power
Accession Number
79N24995
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available