Active Combustion Control Using a Fluidic Oscillator for Asymmetric Fuel Flow Modulation

Parameters Governing Separation Control with Sweeping Jet Actuators

“…Flow visualization experiments inside a large-scale actuator support the argument that a stream is flowing through the feedback channels [69] . Guyot et al [40] demonstrated that the sweeping frequency of these fluidic devices, when supplied with different fluids, is a function of volume flowrate and therefore jet velocity rather than mass flowrate. Although for subsonic jet velocities the sweeping frequency appears to be a linear function of flowrate per actuator, there are distinctive deviations from this linear pattern.…”

“…I love you! Figure 1 -Conceptual actuator designs: a) discrete jet outlets [40] , b) continuous sweeping range [39] . Comparisons between experimental and numerical results reveal that the inviscid flow solution appears to be a suitable predictor for the effectively and efficiently obtainable lift of a given airfoil configuration.…”

“…Several active and passive concepts to provide the oscillatory character of the emitted jet have been proposed, including selfinduced feedback [43] and external control [42,[44][45][46][47] designs. Early actuators for flow control used a splitter in the outlet nozzle [36,40,55] , which forced the jet to exit through discrete outlets ( Figure 1a) instead of having a continuous sweeping range ( Figure 1b). …”

“…Figure 1 -Conceptual actuator designs: a) discrete jet outlets [40] , b) continuous sweeping range [39] .…”

“…combustion control [40] ). The characteristics of various actuator types, conceptually similar to the designs shown in Figure 1, have been investigated experimentally [31][32][33][41][42][43][44][45][46][47][48] and numerically [48][49][50][51][52] by numerous researchers.…”