US 12,085,028 B2
Method and device for detecting a rotating stall adversely affecting a turbojet engine compressor
Soufiane Herda, Moissy-Cramayel (FR); Vincent Michel Cabret, Moissy-Cramayel (FR); and Cedrik Djelassi, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/298,806
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Nov. 29, 2019, PCT No. PCT/FR2019/052853
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/115405, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 18 72254 (FR), filed on Dec. 3, 2018.
Prior Publication US 2022/0056853 A1, Feb. 24, 2022
Int. Cl. F02C 9/28 (2006.01); F02C 9/20 (2006.01); F04D 27/00 (2006.01); F04D 27/02 (2006.01)
CPC F02C 9/28 (2013.01) [F02C 9/20 (2013.01); F04D 27/001 (2013.01); F04D 27/0246 (2013.01); F05D 2220/323 (2013.01); F05D 2270/083 (2013.01); F05D 2270/101 (2013.01); F05D 2270/3011 (2013.01); F05D 2270/303 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for detecting a rotating stall adversely affecting a compressor of a turbojet engine, comprising:
determining a level of variation of a static pressure in a combustion chamber of the turbojet engine around an average value of said static pressure;
comparing the level of variation of the static pressure relative to a first threshold;
comparing a temperature measured at an outlet of a turbine of the turbojet engine relative to a second threshold; and
when the level of variation of the static pressure is greater than the first threshold and when the temperature at the outlet of the turbine is greater than the second threshold, detecting a presence of a rotating stall,
wherein the determining the level of variation of the static pressure comprises:
evaluating, for a plurality of samples of a measurement signal of the static pressure in the combustion chamber, a difference between the value of the static pressure for said samples and the average value of the static pressure, and
for each pair of successive samples of said plurality of samples comprising a first and a second sample:
calculating a deviation between the difference evaluated for the first sample and the difference evaluated for the second sample, and
determining the level of variation of the static pressure relative of the average value of the static pressure based on the calculated deviation.