The development and implementation of synthetic jets for the control of separated flow

Crook, Andrew; Sadri, A.; Wood, N. J.

doi:10.2514/6.1999-3176

Cited by 105 publications

(54 citation statements)

References 2 publications

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“…The principle advantage of using LDA with 90-deg off-axis receiving optics vs PIV to measure velocity is the potential to achieve a much higher spatial resolution. Using the same 200-mm microlens with bellows extension as the PIV system in an off-axis receiving optics configuration that uses a pinhole aperture, the LDA probe volume is approximately (0.058 mm) 3 , giving a spatial resolution approximately four times better than the present PIV setup. Phaseaveraged velocity measurements are acquired at a given point with a resolution of 10 deg, and approximately 100 velocity values are acquired at each phase angle.…”

Section: Experimental Studiesmentioning

confidence: 99%

Formation Criterion for Synthetic Jets

et al. 2005

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A formation criterion for synthetic jets is proposed and validated. A synthetic jet actuator is a zero-net mass-flux device that imparts momentum to its surroundings. Jet formation is defined as the appearance of a time-averaged outward velocity along the jet axis and corresponds to the generation and subsequent convection or escape of a vortex ring. It is shown that over a wide range of operating conditions synthetic jet formation is governed by the jet Strouhal number Sr (or Reynolds number Re and Stokes number S). Both numerical simulations and experiments are performed to supplement available two-dimensional and axisymmetric synthetic jet formation data in the literature. The data support the jet formation criterion 1/Sr = Re/S 2 > K, where the constant K is approximately 1 and 0.16 for two-dimensional and axisymmetric synthetic jets, respectively. In addition, the dependence of the constant K on the normalized radius of curvature of a rounded orifice or slot is addressed. The criterion is expected to serve as a useful design guide for synthetic jet formation in flow control, heat transfer, and acoustic liner applications, in which a stronger jet is synonymous with increased momentum transfer, vorticity generation, and acoustic nonlinearities.

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Section: Experimental Studiesmentioning

confidence: 99%

Formation Criterion for Synthetic Jets

et al. 2005

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“…Several studies on synthetic jet applications have demonstrated that flow separation can be mitigated or even suppressed altogether (e.g., see Amitay et. al., 1999;Amitay & Glezer, 2002b;Crook et. al., 1999;He et.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Experimental and Numerical Investigation of Active Control of 3-D Flows

Amitary¹,

Jansen²

2011

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A complementary experimental and numerical investigation was performed to study the 3-D flow structures and interactions of finite-span synthetic jets in a cross-flow at a chord-based Reynolds number range from 50,000 to 400,000 and angles of attack between 0 0 to 20 0 . A range of momentum coefficients was considered corresponding to six different blowing ratios in the range of 0.2 to 1.2 with an increment of 0.2 (where, the blowing ratio is defined based on the averaged outstroke jet velocity to the free-stream velocity). Experiments were conducted on two finite wings (unswept and 30 0 swept-back configurations) with a cross-sectional profile of NACA 4421, where both 2-D and stereoscopic PIV data were collected at various spanwise locations along the wing. In complement to the experiments, 3-D numerical simulations were performed, where the numerical setup not only matched the physical parameters (e.g., free-stream, blowing ratio, etc.) but also the physical dimensions (e.g., orientation and location of jet, flow control cavity including slot and chamber, etc.). Note that the numerical simulations only address one topic, which is the interaction of a single synthetic jet with a cross-flow over the unswept wing configuration, whereas the experiments included three sets of data: (1) a single finite span synthetic jet interacting with a finite unswept wing, (2) a single finite span synthetic jet interacting with a finite sweptback wing, and (3) multiple finite span synthetic jets interacting with a finite unswept wing.I.

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“…Chen et al [4] and Davis and Glezer [6] have presented the mixing enhancement for the active control of separation and turbulence in the boundary layer (see also Smith and Glezer [15], and Crook et al [5]). Mittal et al [12] studied the performance of a synthetic jet actuator, based on a number of geometrical, structural and flow parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Synthetic Jet with OpenFOAM

Liu

Kazakidi

Medeiros

et al. 2015

Fluid Mechanics and Its Applications

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Numerical simulations of flow surrounding a synthetic jet actuating device are presented. By modifying a dynamic mesh technique available in OpenFOAM,a well-documented open-source solver for fluid dynamics, detailed computations of the sinusoidal motion of the synthetic jet diaphragm were possible. Numerical solutions were obtained by solving the two dimensional incompressible viscous N-S equations, with the use of a second order implicit time marching scheme and a central finite volume method for spatial discretization in both streamwise and crossflow directions. A systematic parameter study is reported here, in which the external Reynolds number, the diaphragm amplitude and frequency, and the slot dimensions are varied.

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The development and implementation of synthetic jets for the control of separated flow

Cited by 105 publications

References 2 publications

Formation Criterion for Synthetic Jets

Formation Criterion for Synthetic Jets

Fundamental Experimental and Numerical Investigation of Active Control of 3-D Flows

Numerical Simulation of a Synthetic Jet with OpenFOAM

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