Gas turbine air compressor and control therefor

Claim 1

In combination with a turbojet engine having a combustor, a gas turbine and air compressor driven by gaseous products of combustion generated by compressed air and fuel burned in the combustor, a by-pass means communicating with the compressor to by-pass some of the compressed air flowing to the combustor, outlet conduit means communicating with said by-pass means for receiving from the latter by-pass compressed air and conducting the compressed air to a place of use or storage, and a safety control system comprising: a. a valve means disposed in an open position in said outlet conduit means; b. transmitter means for sensing compressor inlet and outlet air pressure and transmitting signals corresponding to such air pressures; and c. controller means connnected to said valve means and to the transmitter means to receive the signals from the transmitter means and, when the pressure ratio decreases below a predetermined minimum pressure ratio, respond thereto and cause the valve means to move toward the closed position and modulate compressed air flow through the outlet conduit means until the predetermined minimum pressure ratio is restored.