Sensing surges in gas turbine engines

Details Sensing surges in gas turbine engines Sensing surges in gas turbine engines

1982-12-10

1985-03-19

Caldwell, Sr., John W.

Measuring and testing

Test stand

For engine

374144, G01J 534, D02B 300

Patent

active

045051500

ABSTRACT:
A pyrometer which senses blade temperature in the engine as also used to detect the onset of an engine surge. The output of the pyrometer 2 (FIG. 1) passes to a level detector unit, comprising a differential amplifier and a constant reference voltage, and which produces an output when the pyrometer signal exceeds the reference voltage. A duration detector comprising a monostable 12, inverter 14, delay line 18 and AND gate 16 determines the duration of the excess level signal and if the duration exceeds a given time, set by the monostable, an output from the duration detector actuates a fuel chopper to minimize the effect of the surge.

REFERENCES:
patent: 3426322 (1965-10-01), Balo
patent: 3696678 (1972-10-01), Mossey
patent: 3855864 (1974-12-01), Douglas
patent: 3938479 (1976-02-01), Oberstadt

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