Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow

Wang, Peng; Shen, Chibing

doi:10.1631/jzus.a1900130

Cited by 26 publications

(8 citation statements)

References 43 publications

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“…The SJs are particularly useful in the LED cooling systems such as SynJet ® [3] or the configuration investigated in [4]. SJ is also used in flow control [5,6], mixing [7,8] and other fields.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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The acoustic and flow aspects of the novel synthetic jet actuator (SJA) with fins inside the cavity were experimentally investigated for three types of enclosure design and two models of loudspeaker. The aim of the study is to find the parameter which connects the flow and acoustic properties of the SJA and allows us to choose the optimal solution in those regards. The hot wire anemometry was used for the velocity measurements and the sound pressure level was measured with a sound level meter. The model of the loudspeaker turned out to have a significantly stronger impact on the flow parameters and noise level than the shape of the fins in the cavity. The parameter that showed a dependence on the shape of the fins was the actuator’s efficiency. A ratio of the root-mean-square velocity at the orifice axis to the sound pressure level (U0.c/SPL) was used to connect the acoustic and flow properties of the tested actuators. This parameter was subsequently applied to determine the best configuration among the tested actuators.

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Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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“…The modification and increasing of the SJA parameters are important, especially for their application. The SJA can be used for enhanced heat transfer [7][8][9], mixing [10][11][12], or broadly defined active flow control [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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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“…The SJ has many applications and can be used in electronic cooling [1,3], mixing enhancement [4,5], flow control [6][7][8], or underwater propulsion systems [9,10]. Especially the first area of the SJ application is now developed and new types of actuators [11,12] are still developed to increase the efficiency of the cooling system.…”

Section: Introductionmentioning

confidence: 99%

“…The schematic way of SJ generation was presented in Figure 1. The synthetic jet actuator (SJA) can move the fluid using a loudspeaker [1], piezoelectric transducer [2], piston [3], or plasma [4]. The SJA with the chevron nozzle was investigated by Crispo et al [26][27][28].…”

Section: Introductionmentioning

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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Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow

Cited by 26 publications

References 43 publications

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

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

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

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