Virtual Shaping of a Two-dimensional NACA 0015 Airfoil Using Synthetic Jet Actuator

Chen, Fang-Jenq; Beeler, George B.

doi:10.2514/6.2002-3273

Cited by 31 publications

(16 citation statements)

References 4 publications

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“…SJs are a promising alternative for various applications of active flow control, such as jet vectoring and exciting (Pack and Seifert [16], Smith and Glezer [17], Tamburello and Amitay [18], Ben Chiekh et al [19]); for flow control/triggering of mean flow development (Hong [20], Watson and Sigurdson [21]); for flow control in external aerodynamics (Chen and Beeler [22], Mittal and Rampunggoon [23], Amitay and Glezer [24], Tensi et al [25]); and for flow control in internal aerodynamics (Ben Chiekh et al [26]). …”

Section: Introductionmentioning

confidence: 99%

“…A typical SJ actuator uses one, two, or more driven diaphragms. For example, Yang [47] used a dual-diaphragm piezoelectrically driven SJ actuator to generate a two-dimensional SJ issuing from a 0.5×35 mm slot; Smith and Swift [48] used a set of eight loudspeakers to generate a two-dimensional SJ issuing from a 5.1×241 mm slot; and Chen and Beeler [22] used a set of 14 pairs of piezoelements to generate a twodimensional SJ issuing from a 0.5×762 mm slot. In the mentioned studies [47,48,22], air was the working fluid.…”

Section: Introductionmentioning

confidence: 99%

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Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water

Broučková

Vít

Trávníček

2015

EPJ Web of Conferences

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Abstract. The present study deals with a slot synthetic jet (SJ) issuing from an actuator into quiescent surroundings and driven by a piezoceramic transducer. The actuator slot width was 0.36 mm, with a drive frequency proposed near the theoretical natural frequency of the actuator. The working fluid was water at room temperature. The present experiments used flow visualization (a laser-induced fluorescence technique) and laser Doppler vibrometry methods. Flow visualization was used to identify SJ formation, to demonstrate its function, and to estimate SJ velocity. Laser Doppler vibrometry was used to quantify diaphragm displacement and refine operating parameters. Phase averaging yielded a spatial and temporal diaphragm deflection during the actuation period. Taking incompressibility and continuity into consideration, the velocity in the actuator slot and the Reynolds number of the SJ were evaluated as 0.21 m/s and 157, respectively. The present results confirmed a SJ actuator function at the resonance frequency of approximately 46 Hz, which corresponds closely with the theoretical evaluation. The laser Doppler vibrometry results corresponded closely with an estimation of SJ velocity by the present flow visualization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water

Broučková

Vít

Trávníček

2015

EPJ Web of Conferences

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“…SJs are promising alternatives for various applications of active flow control such as jet vectoring (Pack and Seifert 2001;Smith and Glezer 2002), exciting (or shaking or flapping) jets (Tamburello and Amitay 2007;Ben Chiekh et al 2011;Trávníček et al 2012c), and flow control in external (Chen and Beeler 2002;Mittal and Rampunggoon 2002;Amitay and Glezer 2002;Tensi et al 2002;Tang et al 2014;Chaudhry and Zhong 2014) and internal (Ben Chiekh et al 2003;Martin et al 2014) aerodynamics. Another relevant field for SJ applications is heat transfer (Trávníček and Tesař 2003;Kercher et al 2003;Mahalingam et al 2004;Gillespie et al 2006;Arik 2007;Valiorgue et al 2009;Chaudhari et al 2010;Persoons et al 2011;Qayoum and Panigrahi 2015).…”

mentioning

confidence: 99%

Visualization study of hybrid synthetic jets

Broučková

Trávníček

2014

J Vis

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A synthetic jet (SJ) is a fluid flow that is created from an oscillatory process of suction and blowing. A hybrid synthetic jet (HSJ) combines this principle with fluidic pumping through a valveless pump. The present study addresses round HSJs issuing into quiescent surroundings from an actuator orifice 8 mm in diameter. For comparison purposes, a common (zero-net-mass-flux) SJ is used. The working fluid is air, and the maximum Reynolds numbers are 11,000 and 9,000 for HSJs and SJs, respectively. The following five experimental methods are employed: flow visualization using a smoke wire technique, velocity measurements using a hot-wire anemometer, velocity measurements using a Pitot tube, impedance measurements of the actuators, and measurements of the jet momentum using precision scales. Flow visualization demonstrates phase-locked flow fields. The first resonance frequencies are theoretically derived to be 79 and 98 Hz for an SJ and HSJ, respectively. These values are confirmed by all of the experimental methods used. The results demonstrate the advantages of HSJs. The tested HSJ achieves a 24 % higher pumped volume flow rate in comparison to the SJ at a maximum volumetric efficiency of 33 %. Moreover, the overall energy efficiency of the HSJ actuator is 1.8 times higher than that of the SJ actuator. These promising HSJ features, including significantly higher efficiencies, can be useful for various heat transfer applications such as the cooling of highly loaded electronic devices.

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“…These synthetic jets have been produced with speakers, compressed air, air pumps, and bimorph diaphragms among others [17,18,19]. All of the above techniques however add weight, require real estate, and add complexity to an airplane making these options not feasible or practical.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Actuators for Synthetic Jet Applications

Mossi

Bryant

2003

MRS Proc.

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Synthetic jets have been identified and utilized widely in airflow control applications. These jets of air are usually created by the use of compressed air, or an electromechanically driven vibrating platform. All of these approaches produce desired results in airflow-control such as enhanced lift and increased maneuverability. Despite the results however, system weight, size, response time and force limit their use in aircraft applications where space is a premium. The objective of this study is to characterize the relevant properties for the design of a synthetic jet utilizing three types of piezoelectric actuators as mechanical diaphragms. The limiting parameters of the actuators for this application are shape and volumetric space. Thus, the actuators were circular with a diameter of 6.35 cm, and overall device cavity volume no larger than 147.5 cm 3 on a 7 cm x 7 cm areal coverage. The actuators tested were pre-stressed curved metallic unimorphs, bimorphs, and radial field diaphragms. These piezoelectric elements were chosen because of their geometry, quasi-isostatic topography and overall free-displacement. Each actuator was affixed about its perimeter in a cavity, and relevant parameters such as clamped displacement, and jet velocity though a pre-determined dimensional slot, were measured.

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Virtual Shaping of a Two-dimensional NACA 0015 Airfoil Using Synthetic Jet Actuator

Cited by 31 publications

References 4 publications

Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water

Laser Doppler vibrometry experiment on a piezo-driven slot synthetic jet in water

Visualization study of hybrid synthetic jets

Piezoelectric Actuators for Synthetic Jet Applications

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