Emergency shut-down detection system for a gas turbine
First Claim
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1. A gas turbine engine comprising:
- a fan;
an IP compressor arranged aft of the fan;
an HP compressor arranged aft of the IP compressor;
a combustor arranged aft of the HP compressor;
an HP turbine arranged aft of the combustor and coupled to said HP compressor by an HP spool;
a bearing assembly comprising a bearing mounted on the HP Spool, the bearing assembly supporting an inner housing, an outer housing and a spring bar assembly arranged between the inner housing and the outer housing, the spring bar assembly having a plurality of circumferentially disposed spring bars configured to flex, the outer housing having a protrusion;
at least one electrical speed sensor arranged fore of said HP compressor and near the protrusion, the at least one electrical speed sensor operable to provide a compressor speed signal, said at least one speed sensor including an electrical continuity circuit operable to generate a continuity signal for the electrical speed sensor;
a controller having a number of inputs for receiving at least one measured engine parameter and a number of outputs for transmitting control signals for controlling engine operation variables, said controller including an input for receiving the speed signal and the continuity signal;
wherein when the HP spool fractures, the HP compressor generates a forward axial force to fracture the spring bars causing the protrusion to sever the at least one speed probe resulting in a simultaneous termination of the compressor speed signal and continuity signal.
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Abstract
A gas turbine engine is provided with a controller configured to detect a spool shaft failure and to initiate an engine shut-down in response to the shaft failure. The controller evaluates the compressor speed probe, the speed probe continuity, P30 pressure and compressor surge to determine whether a shaft failure has occurred.
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Citations
7 Claims
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1. A gas turbine engine comprising:
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a fan; an IP compressor arranged aft of the fan; an HP compressor arranged aft of the IP compressor; a combustor arranged aft of the HP compressor; an HP turbine arranged aft of the combustor and coupled to said HP compressor by an HP spool; a bearing assembly comprising a bearing mounted on the HP Spool, the bearing assembly supporting an inner housing, an outer housing and a spring bar assembly arranged between the inner housing and the outer housing, the spring bar assembly having a plurality of circumferentially disposed spring bars configured to flex, the outer housing having a protrusion; at least one electrical speed sensor arranged fore of said HP compressor and near the protrusion, the at least one electrical speed sensor operable to provide a compressor speed signal, said at least one speed sensor including an electrical continuity circuit operable to generate a continuity signal for the electrical speed sensor; a controller having a number of inputs for receiving at least one measured engine parameter and a number of outputs for transmitting control signals for controlling engine operation variables, said controller including an input for receiving the speed signal and the continuity signal; wherein when the HP spool fractures, the HP compressor generates a forward axial force to fracture the spring bars causing the protrusion to sever the at least one speed probe resulting in a simultaneous termination of the compressor speed signal and continuity signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification