Backup Control Airstart Performance on a Digital Electronic Engine Control-Equipped F100 Engine
Johnson, J. Blair (1984) Backup Control Airstart Performance on a Digital Electronic Engine Control-Equipped F100 Engine.
Full text available as: |
Abstract
The airstart capability of a backup control (BUC) was tested for a digital electronic engine control- (DEEC-) equipped F100 engine, which was installed in an F-15 airplane. Two airstart schedules were tested. The first was referred to as the group I schedule and the second, or revised schedule, was referred to as the group II start schedule. Using the group I start schedule, based on a 40- and 25-percent BUC mode spooldown airstarts. If core rotor speed (N2) was less than 40 percent, a stall would occur when the start bleeds closed - 40 sec after initiation of the airstart. All jet fuel starter- (JFS-) assisted airstarts were successful with the group I start schedule. For the group II schedule, the time between pressurization and start bleed closure ranged between 50 sec and 72 sec, depending on altitude. All airstarts were successful above approximately 200 knots giving a 75- to 100-knot reduction in required airspeed for a successful airstart. Forty-percent spooldown airstarts were successful at 200 knots, at altitudes up to 10,650 meters, and were successful at 175 knots at altitudes up to 6100 meters. Idle rpm was lower than the desired 65 percent for airstarts at higher altitudes and lower airspeeds. All JFS-assisted airstarts were successful.
| EPrint Type: | Other |
|---|---|
| Keywords: | Digital control, Engine control, Flight tests, F-15 airplane, F100 engine. |
| Subjects: | (01 - 09) Aeronautics: (07) Aircraft Propulsion And Power Aircraft/Project: F-100 |
| ID Code: | 2029 |
| Deposited On: | 23 July 2009 |
| Additional Information: | 14 pages. NASA CP-2298, Paper 10, Digital Electronic Engine Control (DEEC) Flight Evaluation in an F-15 Airplane, March 1984, pp. 157-170. |
