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Effect of control logic modifications on airstart performance of F100 engine model derivative engines in an F-15 airplaneA series of airstarts were conducted in an F-15 airplane with two prototype Pratt and Whitney F100 Engine Model Derivative engines equipped with Digital Electronic Engine Control (DEEC) systems. The airstart envelope and the time required for airstarts were defined. Comparisons were made between the original airstart logic, and modified logic which was designed to improve the airstart capability. Spooldown airstarts with the modified logic were more successful at lower altitudes than were those with the original logic. Spooldown airstart times ranged from 33 seconds at 250 knots to 83 seconds at 175 knots. The modified logic improved the airstart time from 31% to 53%, with the most improved times at slower airspeeds. Jet fuel starter (JFS)-assisted airstarts were conducted at 7000 m and airstart times were significantly faster than unassisted airstarts. The effect of altitude on airstart times was small.
Document ID
19840021810
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Crawford, D. B. (NASA Ames Research Center Moffett Field, CA, United States)
Burcham, F. W., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1984
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NAS 1.15:85900
NASA-TM-85900
H-1243
Accession Number
84N29879
Funding Number(s)
PROJECT: RTOP 533-02-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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