Characteristics of a Fluidic Oscillator with Low Frequency and Low Speed and Its Application to Stall Margin Improvement

Active flow control methods are commonly used in expanding the operating range of compressors. Indeed, unsteady active main focus researchers due to their effectiveness. For constructing an system, reliable actuators significant. To compare with conventional such as synthetic jet and rotating valves, fluidic oscillators have structurally robust characteristics can generate self-excited self-sustained oscillating jets, which leads its higher applicability compressors under severe working conditions. Thus, explore feasibility systems by usage oscillators, a low-frequency low-speed oscillator is first designed experimentally studied for improving stability axial compressor. During experiments, special casing install 15 uniformly distributed tip region Based on micro injections rotor rotation frequency, results indicate that frequency/period flexible, values decoupled variation inlet pressure. When inlet-to-outlet pressure ratio 1.1~2.0, maximum velocity ranges from 30 m/s 80 m/s. Moreover, mass rate single only varies 0.017‰ 0.059‰ compressor rate. improvement stall margin, value 3.45% when total 0.08% flow.