A numerical study is conducted to explore the unsteady nature of fluidic oscillators, which are responsible for generating sweeping jets for effective flow control of large-scale applications. Two- and three-dimensional unsteady Reynolds-averaged Navier–Stokes and three-dimensional improved delayed detached-eddy simulations are employed to simulate and resolve the flow structures in the internal flow passages of a fluidic oscillator and an external flowfield in a quiescent flow condition. The predicted flow generated by an enlarged actuator with an outlet diameter of 25 mm using air as a working fluid is validated against measurements at various supply rates. A comparison of current computational results using two-dimensional and three-dimensional unsteady Reynolds-averaged Navier–Stokes simulations with experiments indicates a reasonable agreement in the jet oscillation frequency. However, a significant discrepancy in the streamwise velocity field is observed between the two-dimensional unsteady Reynolds-averaged Navier–Stokes and experimental data. The three-dimensional unsteady Reynolds-averaged Navier–Stokes simulation also underpredicts the jet width, and consequently overpredicts the extension of the jet in the axial direction downstream of the actuator exit. Excellent agreement in the jet oscillation frequency and internal and external flowfields is obtained at two supply rates between the three-dimensional improved delayed detached-eddy simulation and the measurements. Simulations are also performed for a small-scaled actuator with a hydraulic outlet diameter of 1.3 mm, with water as the working fluid. The predicted oscillation frequency of the jet is compared with the experiments. A scaling analysis is also conducted by analyzing and correlating the flow characteristics and key parameters of the two actuators’ scales.
Computational Fluid Dynamic Analysis of Fluidic Actuator for Active Flow Control Applications
AIAA Journal ; 56 , 1 ; 111-120
2018-01-01
Article (Journal)
Electronic Resource
English
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