Surge detector for turbine engines

Details Surge detector for turbine engines Surge detector for turbine engines

1974-12-11

1976-01-27

Husar, C. J.

Communications: electrical

Selective

Having indication or alarm

73115, 73116, 60223, 60226R, 60 3928R, G01M 1500, F02C 902

Patent

active

039355586

ABSTRACT:
A pair of pressure transducers are connected to pressure probes positioned in a flow passage of a turbofan engine downstream of the fan and respond to pressure fluctuations which occur in the airstream. One transducer has a high response capability, and its output is passed through a band-pass filter to isolate the high frequencies of interest. The other transducer has a low response capability, and its output is passed through a low-pass filter to provide the steady state pressure level. A triggering level is scheduled as a function of the steady state pressure level, and a comparator is used to continuously compare the triggering level with the level of the high frequency pressure signal produced in the band-pass filter. If the amplitude of the high frequency pressure is greater than that of the triggering level, the engine is approaching a surge or stall condition, and a warning signal is generated which may be used to institute corrective action.

REFERENCES:
patent: 3267669 (1966-08-01), Tissier
patent: 3392739 (1968-07-01), Taplin et al.
patent: 3671134 (1972-06-01), Boothe
patent: 3677000 (1972-07-01), Thomson
patent: 3868625 (1975-02-01), Speigner et al.

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