Ramjet/scramjet inlet isolator unstart prevention

Details Ramjet/scramjet inlet isolator unstart prevention Ramjet/scramjet inlet isolator unstart prevention

1995-12-11

1998-09-15

Casaregola, Louis J.

Power plants

Reaction motor

Method of operation

60243, 137 152, F02K 710

Patent

active

058063013

ABSTRACT:
Pressure sensors are placed at axial locations in the isolator of a scramjet or ramjet. An engine fuel control produces calculated pressure values for the those locations from a stored function. As the engine operates, the pressure signals from the pressure sensors are compared with those pressure values for each sensor location and the stored function is adjusted so that the curve of the calculated pressures closely matches the measured pressures within stored upper and lower pressure limits for each pressure sensor location. From the adjusted function. the shock system is located. Fuel flow is controlled to maintain the shock system at a desired location in the isolator. Faulty pressure sensors are detected from a signal that manifests the difference between calculated and actual pressure at each pressure sensor.

REFERENCES:
patent: 3181818 (1965-05-01), Pearl
patent: 3791141 (1974-02-01), Bush et al.
patent: 3911260 (1975-10-01), Dustin
patent: 4277940 (1981-07-01), Harner et al.

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