Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Societe Nationale D'etude Et De Construction De Moteurs D'aviation-snecma

Jean-Yves Capelle

Michel A Desaulty

Jean-Marie Brocard

Jean-Paul Perrin

Eric Charles Le Letty

Alain Michel Varizat

A device for actively controlling combustion instabilities and for decoking uel injectors comprises at least one detector for measuring pressure fluctuations in a combustion or afterburner chamber, means for processing the signal output by the detector and providing, in turn, a control voltage, and at least one piezoelectric device which is disposed in a hydraulic line including a fuel injector for the supply of fuel to the combustion or afterburner chamber and which is responsive to the control voltage to generate pulses in the flow of fuel from the outlet of the fuel injector.

Device for actively controlling combustion instabilities and for

A method of preventing instabilities due to combustion in a multi-flow turbojet engine including an afterburner into which an air-fuel mixture is injected in proportions measured in richness terms, which includes the steps of detecting experimentally, when tuning the turbojet engine, the zones of vibrations due to afterburn as a function of the operating conditions of the engine and as a function of the afterburn operating region, and selecting operating points for regulating the fuel richness of each flow to enable the detected vibration zones to be avoided.

Method of preventing instabilities produced by combustion in a turbojet

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Montlhery, France

Jean-Yves Capelle