Abstract: In a gas turbine engine, combustor flame temperature is maintained within predetermined limits by increasing the combustor airflow during periods of increasing fuel flow and by increasing the burner area when the airflow has reached an upper limit. Increases in burner area are countered by decreasing airflow until the airflow reaches a lower limit, at which time the procedure repeats itself. When the fuel flow is decreased, the airflow is reduced until it reaches its lower limit, at which time the burner area is decreased, allowing the airflow to rise to its upper limit, at which time, the procedure repeats itself.

Abstract: In a gas turbine engine, fuel is supplied to a fuel metering valve which is connected to a shutoff valve. The shutoff valve supplies fuel to a manifold. Fuel flow between the manifold and main fuel nozzles is controlled by fuel staging valves while the pilot nozzle is connected directly to the manifold by a fuel line which may include an orifice. The orifice is designed to match the flow in the pilot nozzle with the flow in main nozzles when the fuel staging valve is on.

Abstract: A Doppler radar speed sensing system includes a microwave transceiver and a circuit for generating an input pulse train having pulsewidths related to the ground speed of a vehicle carrying the system. A signal processor includes a microprocessor which executes a signal processing algorithm which converts the input pulse train to an output pulse train having desired characteristics. For example, the output pulse train has output pulses with pulsewidths and frequency related to the vehicle ground speed. The output signal pulse train responds rapidly to changes in sensed ground speed, but is insensitive to Doppler signal dropout.