Effect of Control Logic Modifications on Airstart Performance of F100 Engine Model Derivative Engines in an F-15 Airplane
Crawford, David B. and Burcham Jr., Frank W. (1984) Effect of Control Logic Modifications on Airstart Performance of F100 Engine Model Derivative Engines in an F-15 Airplane. Technical Report NASA TM-85900, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
A series of airstarts were conducted in an F-15 airplane with two prototype Pratt & 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 percent to 53 percent, with the most improved times at slower airspeeds. Jet fuel started (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.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Airstart, Digital control, F100 engine, F-15 airplane |
| Subjects: | (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power Aircraft/Project: F-15 |
| ID Code: | 621 |
| Deposited On: | 01 Febuary 2006 |
| Additional Information: | 30 pages. |
