Concept of self-excited unsteady flow control on a compressor blade and its preliminary proof by numerical simulation

Lu, Wei-Yu; Jiao, Yanmei; Fu, Xin

doi:10.1016/j.ast.2022.107498

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…When blade loads are increased to levels far above the current aerodynamic design level, flow separation usually occurs due to high inverse pressure gradients or shock-boundary layer interaction, causing a dramatic decrease in fluid mechanical efficiency and even engine surge. Through flow control techniques, flow separation can be reduced or even eliminated, thereby improving the pressure ratio, efficiency, and stability margin of compressors considerably (Liu et al, 2019;Qin et al, 2020;Lu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a novel fluidic oscillator with movable feedback channels and resonators

Yan

Yang

et al. 2023

Front. Energy Res.

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In this study, a novel fluidic oscillator suitable for use as a key component of a flow control device is proposed and investigated through numerical simulations. The new layout adds resonators to a typical fluidic oscillator with dual feedback channels, and the length of the feedback loop is designed to be adjustable. This fluidic oscillator with movable feedback channels and resonators can generate a jet with an adjustable frequency, and it has smaller total pressure loss than the baseline model. Numerical results show that the movement of the feedback channels regulates the degree of coupling between the feedback channels and resonators to generate different orders of jet frequencies. This self-excited fluidic oscillator with adjustable jet frequency is more adaptive than typical designs when dealing with complex flow separation conditions, and it will be more stable because the frequency adjustment requires neither high-frequency movable mechanisms nor external energy input. Moreover, the frequency switching phenomenon is observed in special cases, which may help improve the efficiency of the compressor blades with a drastically changed dominant frequency under off-design conditions or with multiple dominant frequencies, such as tip leakage flow and shock–boundary layer interaction.

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Section: Introductionmentioning

confidence: 99%