Impact of the confinement plate on the synthetic jet

Smyk, Emil; Przeszłowski, Łukasz; Strzelczyk, Piotr

doi:10.1063/5.0022813

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…The increase of real power does not increase the energetic efficiency of the SJA (Figure 5b). That this course of efficiency charts as a function of real power is typical and it can be observed in many papers for different actuator types [8,26,29,34]. The electrical efficiency function of the SJA was independent of the orifice shape.…”

Section: Time-mean Reaction Force Measurementssupporting

confidence: 59%

“…The formation criterion was fulfilled in the whole measuring range. This issue is described in more detail in [34]. Milanovic and Zaman [43] defined the formation criterion as L/d > 0.4.…”

Section: Time-mean Reaction Force Measurementsmentioning

confidence: 99%

“…The orifice with oscillating cross-section area [30,31], the virtual orifice [32], or using the confinement effect [33,34] are the other methods of changing the SJ parameters by the change of the orifice. However, the authors of this paper decided to choose the simpler and more basic method of orifice modification.…”

Section: Introductionmentioning

confidence: 99%

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Synthetic Jet Actuators with the Same Cross-Sectional Area Orifices-Flow and Acoustic Aspects

2021

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In this paper, synthetic jet actuators (SJAs) with three different orifice shapes (circular, square, and slot) with the same cross-section area were investigated. The SJA efficiency and the synthetic jet (SJ) Reynolds number were calculated based on the time-mean reaction force measurement. The momentum velocity was measured with hot-wire anemometry and additionally, the sound pressure level (SPL) was measured. The efficiency was equal maximally to 5.3% for each orifice shape, but the square orifice characterized the higher Reynolds number. The compared centerline (axial) velocities and the radial velocity profile at a distance of 112 mm were similar for each orifice type. The SPL measurement results were surprisingly constant in relation to each other. The square orifice generates the lowest SPL, approximately 2.8dB lower than the circular orifice, and approximately 4.2dB lower than the slot orifice, at each investigated real power. Finally, the differences to other papers and limitations of the approach to comparing orifices presented in the present paper were indicated.

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Section: Time-mean Reaction Force Measurementssupporting

confidence: 59%

“…The formation criterion was fulfilled in the whole measuring range. This issue is described in more detail in [34]. Milanovic and Zaman [43] defined the formation criterion as L/d > 0.4.…”

Section: Time-mean Reaction Force Measurementsmentioning

confidence: 99%

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Synthetic Jet Actuators with the Same Cross-Sectional Area Orifices-Flow and Acoustic Aspects

2021

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“…The efficiency was calculated only for the resonant frequency, and for this reason, the power factor was approximate as cos(𝜑) = 1. Gil and Smyk [39] and Smyk et al [37] confirmed this dependence. However, it was used earlier [40].…”

Section: Resonant Frequencymentioning

confidence: 79%

“…The SPL was measured according to ISO 3746:2010 [35]. The same measurements method was used in [31,36,37].…”

Section: Methodsmentioning

confidence: 99%

Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet

Smyk

2021

Applied Sciences

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The application of a synthetic jet actuator in workplaces entails the necessity of noise reduction, which they generate. One of the methods to achieve this is the use of the chevron orifice or nozzle. Therefore, the impact of different numbers of chevrons and rounding of cutouts in the orifice on the actuator efficiency and the sound pressure level was tested. The chevron orifices were compared to the circular orifice. The time-mean reaction force method was used to measured efficiency and flow parameters, and the noise was measured according to the ISO 3746:2010. The rounded cutouts had an advantageous impact on the actuator efficiency at the power P >1 W, while the efficiency of the actuator with classic chevron orifice was smaller than with circular orifice. The noise generated by the actuator with the chevron orifice was smaller from 0.6 to 1.6 dB than by the actuator with the circular orifice, at the number of chevrons equal to 7 or more. The rounding of cutouts in the chevron orifice can advantageously impact the parameters of synthetic jet actuators.

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