Accession Number : ADD001154

Title :   Sonic Means for Detecting Compressor Stall.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Dawson,William H , Jr

Report Date : 18 Mar 1975

Pagination or Media Count : 5

Abstract : The patent relates to a system for providing a warning signal when certain sensed turbine engine operating conditions, specifically certain measured noise levels, indicate a compressor stall is about to occur. A sensing system includes two microphones placed at separate locations on the engine and a tachometer. A computer includes two function generating units, the first unit providing a measured sonic parameter from the microphone signals and the second unit producing a computed sonic parameter from stored empirical engine data as a function of the engine rotational speed. The two sonic parameters thus obtained are fed into a comparator, which provides a stall warning signal when the two signals are equal, indicating incipient compressor stall.

Descriptors :   *Turbines, *Compressors, *Stall warning indicators, *Patents, Signal processing, Detectors, Acoustic signals, Stalling

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE