Integral rocket-ramjet open loop fuel control system

Details Integral rocket-ramjet open loop fuel control system Integral rocket-ramjet open loop fuel control system

1979-07-25

1981-04-28

Garrett, Robert E.

Power plants

Reaction motor

Condition responsive thrust varying means

60245, 60250, 60270R, F02K 906

Patent

active

042637813

ABSTRACT:
In an integral rocket-ramjet having a combustor which initially serves as a rocket combustion chamber for booster propellant, and after the booster propellant is expended, serves as a ramjet combustor where fuel and air are burned, a fuel control system is described for the ramjet stage by which ram burner light-off is automatically initiated upon transition from rocket to ramjet propulsion. The fuel control regulates fuel flow to the combustor over the entire flight regime and responds to operating conditions to provide a light-off schedule, to stabilize the shock wave in the air inlet, to provide a maximum fuel-to-air ratio limit, to limit the maximum vehicle Mach number, and to prevent lean burner blowout by providing a minimum fuel-to-air ratio limit. Mach number limiting is performed in closed loop fashion, while the other functions are scheduled or open loop controls. Fuel flow to combustion chamber pressure ratio is used to provide fuel-to-air ratio limits, actual combustion chamber pressure being measured to provide the desired fuel flow signal.

REFERENCES:
patent: 2729061 (1956-01-01), Grafinger
patent: 2792685 (1957-05-01), Constatino et al.
patent: 3030767 (1962-04-01), Bauer et al.
patent: 3030772 (1962-04-01), Drake
patent: 3080708 (1963-03-01), Carr
patent: 3092960 (1963-06-01), Worley et al.
patent: 3218801 (1965-11-01), Vasu
patent: 3482396 (1969-12-01), Nelson et al.
patent: 3791141 (1974-02-01), Bush et al.
Harner et al., "Control Systems Requirements for Advanced Ramjet Engines", AIAA Conf., Las Vegas, Jul. 25-27, 1978.

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