Apollo 4 combustion instability1/15/2024 In the first case the flame is initially controlled with AIC, the feedback loop is then switched off and the growth of the instability is analysed through high speed Schlieren cinematography and simultaneous sound pressure and reaction rate measurements. Two basic applications of this kind are described. The active instability control (AIC) also constitutes an original and powerful technique for studies of mechanisms leading to instability or resulting from the instability. These systems can suppress all unstable plane modes of oscillation (i.e. Different active control systems tested on a non-premixed multiple-flame turbulent combustor are described. In these methods the instability development is impeded with a feedback control loop: the signal provided by a sensor monitoring the flame or pressure oscillations is processed and sent back to actuators mounted on the combustor or on the feeding system. Candel, S.Ĭlosed-loop active control methods and their application to combustion instabilities are discussed. ![]() Active control: an investigation method for combustion instabilities
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