General Reduced-Order Model to Design and Operate Synthetic Jet Actuators

Persoons, Tim

doi:10.2514/1.j051381

Cited by 68 publications

(56 citation statements)

References 30 publications

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“…These findings have recently been extended by Persoons [20] to include the concept of thermal efficiency as a coefficient of performance for synthetic jet actuators, and how its frequency dependence affects the optimal design and operation of synthetic jet coolers. These investigations reveal much about the potential performance of the synthetic jet, however there is a lack of research which analyses the behaviour of the impinging flow from its component levels, thus providing a clear basis for the resulting heat transfer trends.…”

Section: Impinging Synthetic Jets For Heat Transfer Applicationsmentioning

confidence: 99%

Flow regime characterisation of an impinging axisymmetric synthetic jet

McGuinn

Farrelly

Persoons

et al. 2013

Experimental Thermal and Fluid Science

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-Impinging synthetic jets have excellent potential for energy-efficient local cooling in confined geometries. For a given geometry, synthetic jet flows are mainly characterised by the Reynolds number and the ratio of stroke length to a geometric length scale. The flow field of an impinging synthetic jet and the corresponding surface heat transfer distribution are strongly dependent on the dimensionless stroke length, yet few studies have investigated the flow field dependence for a wide range of stroke lengths. Therefore, the aim of this paper is to identify the various flow regimes as a function of stroke length. The experimental approach combines high speed particle image velocimetry and single point hot wire anemometry, and investigates an 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

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Section: Impinging Synthetic Jets For Heat Transfer Applicationsmentioning

confidence: 99%

Flow regime characterisation of an impinging axisymmetric synthetic jet

McGuinn

Farrelly

Persoons

et al. 2013

Experimental Thermal and Fluid Science

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“…The basic components of the actuator are an oscillatory diaphragm (here loudspeaker), a cavity and an orifice, as shown schematically in figure 9. The relations among actuator deflection x d , cavity pressure p cav and jet velocity u jet are described by the following linear differential equations (Persoons & O'Donovan 2007;Persoons 2012):…”

Section: Appendix a Actuator Modellingmentioning

confidence: 99%

Weakly nonlinear modelling of a forced turbulent axisymmetric wake

2017

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A theory is presented where the weakly nonlinear analysis of laminar globally unstable flows in the presence of external forcing is extended to the turbulent regime. The analysis is demonstrated and validated using experimental results of an axisymmetric bluff-body wake at high Reynolds numbers, Re D ∼ 1.88 × 10 5 , where forcing is applied using a zero-net-mass-flux actuator located at the base of the blunt body. In this study we focus on the response of antisymmetric coherent structures with azimuthal wavenumbers m = ±1 at a frequency St D = 0.2, responsible for global vortex shedding. We found experimentally that axisymmetric forcing (m = 0) couples nonlinearly with the global shedding mode when the flow is forced at twice the shedding frequency, resulting in parametric subharmonic resonance through a triadic interaction between forcing and shedding. We derive simple weakly nonlinear models from the phase-averaged Navier-Stokes equations and show that they capture accurately the observed behaviour for this type of forcing. The unknown model coefficients are obtained experimentally by producing harmonic transients. This approach should be applicable in a variety of turbulent flows to describe the response of global modes to forcing.

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“…The model was validated against experimental measurements of the orifice exit velocity. Following the electroacoustic approach, many other lumped models have been realized, which take into account more and more effects, such as details about the piezoelectric element (Prasad et al [25], Persoons [26]), minor losses (Tang and Zhong [27]), electromagnetic driver (Agashe et al [28], Sawant at al. [29]) and double cavity (Luo et al [30], Arunajatesan [31]).…”

Section: Introductionmentioning

confidence: 99%

LEM Characterization of Synthetic Jet Actuators Driven by Piezoelectric Element: A Review

Chiatto

Capuano

Coppola

et al. 2017

Preprint

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Abstract:In the last decades synthetic jet actuators have gained much interest among the flow control techniques due to their short response time, high jet velocity and absence of traditional piping, that matches the requirements of reduced size and low weight. A synthetic jet is generated by the diaphragm oscillation (generally driven by a piezoelectric element) in a relatively small cavity, producing periodic cavity pressure variations associated with cavity volume changes. The pressured air exhausts through an orifice, converting diaphragm electrodynamic energy into jet kinetic energy. This review paper faces the development of various lumped-element models (LEMs) as practical tools to design and manufacture the actuators. LEMs can quickly predict device performances such as the frequency response in terms of diaphragm displacement, cavity pressure and jet velocity, as well as the efficiency of energy conversion of input Joule power into useful kinetic power of air jet. The actuator performance is analyzed also by varying typical geometric parameters such as cavity height and orifice diameter and length, through a suited dimensionless form of the governing equations. A comprehensive and detailed physical modeling aimed to evaluate the device efficiency is introduced, shedding light on the different stages involved in the process. Overall, the influence of the coupling degree of the two oscillators, the diaphragm and the Helmholtz's one, on the device performance is discussed throughout the paper.

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General Reduced-Order Model to Design and Operate Synthetic Jet Actuators

Cited by 68 publications

References 30 publications

Flow regime characterisation of an impinging axisymmetric synthetic jet

Flow regime characterisation of an impinging axisymmetric synthetic jet

Weakly nonlinear modelling of a forced turbulent axisymmetric wake

LEM Characterization of Synthetic Jet Actuators Driven by Piezoelectric Element: A Review

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