Research Papers: Flows in Complex Systems

Novel Fluidic Diode for Hybrid Synthetic Jet Actuator

[+] Author and Article Information
Jozef Kordík

e-mail: kordik@it.cas.cz

Zdeněk Trávníček

e-mail: tr@it.cas.cz
Institute of Thermomechanics AS CR,
v. v. i.,Dolejškova 5, 182 00 Prague 8, Czech Republic

The experimental data from the SJA were used for the evaluation of the correction factor given in Eq. (5).

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received May 14, 2012; final manuscript received May 29, 2013; published online July 23, 2013. Editor: Malcolm J. Andrews.

J. Fluids Eng 135(10), 101101 (Jul 23, 2013) (7 pages) Paper No: FE-12-1241; doi: 10.1115/1.4024679 History: Received May 14, 2012; Revised May 29, 2013

This paper deals with a new design of a hybrid synthetic jet actuator (HSJA), which is based on a novel fluidic diode. Two fluidic diodes were tested using pressure-drop measurements with air as the working fluid, and their diodicities were evaluated. A greater diodicity was achieved with the new diode design. Two outlet nozzles of the HSJA were tested (shorter and longer), and the velocity resonance curves were evaluated using hot-wire measurements at the outlets of the nozzles. Volumetric efficiency of the HSJA was evaluated as function of the operating frequency. The greatest efficiency was achieved at the second resonant frequency of the actuator with the longer nozzle.

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Grahic Jump Location
Fig. 1

Principle of the HSJA operating cycle. (a) Supply stroke. (b) Pump stroke.

Grahic Jump Location
Fig. 2

The present hybrid synthetic jet actuator; only one of the particular fluidic diodes, D1 or D2, are opened for each particular experiment with HSJ, and the other diode is sealed (not plotted here)—see Table 1

Grahic Jump Location
Fig. 3

Details of both diodes; the depth of the diodes is hD = 5 mm (channel height). (a) Geometry of the labyrinth-type diode D1 and (b) geometry of the Tesla-type diode D2. The size of diode D2 was scaled from optimized dimensions of Tesla-type diode that were suggested by Gamboa et al. [29].

Grahic Jump Location
Fig. 4

Comparison of diodicities as functions of the Reynolds number (Re = QDh/S3ν). Figure compares the experimental results for present diodes D1 and D2 and published results from Ref. [29] (Tesla-type diode—experiment and numerical simulation).

Grahic Jump Location
Fig. 5

Comparison of velocity resonance curves for the SJs and the HSJs; the plotted velocities are found by averaging the velocity U(t) (Eq. (4)) over the positive part of period (0-TE). The curves are measured at the same value of effective input current Ieff = 0.8A.

Grahic Jump Location
Fig. 6

The measured volumetric efficiencies of both HSJA variants (with nozzle N1 and with nozzle N2) as functions of the driving frequency. Equation (6) is used for evaluation of the efficiencies.

Grahic Jump Location
Fig. 7

Comparison of the area-averaged velocity waveforms U(t), defined by Eq. (4), for various driving frequencies f=25-225 Hz and various configurations of the HSJA and SJA: (a) and (b) short nozzle N1, (c) and (d) long nozzle N2



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