Synthetic jet actuator efficiency based on the reaction force measurement

Gil, Paweł; Smyk, Emil

doi:10.1016/j.sna.2019.06.011

Cited by 20 publications

(18 citation statements)

References 19 publications

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“…Generally, in Equation ( 5) the value of real power should be used. However, Gil and Smyk [21] showed that the phase shift between current and voltage tends to zero for the resonant frequency. On the other hand, Broučková and Trávníček [22] took the phase shift as negligible.…”

Section: Data Reductionmentioning

confidence: 99%

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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: Data Reductionmentioning

confidence: 99%

“…However, it should be noted that in [20] the loudspeaker was supplied with lower power and a single-orifice actuator was investigated. The multiple-orifices SJAs tend to achieve greater efficiency than single-orifice ones [21]. It is particularly evident when the SJ is used in the heat exchange applications [23,24].…”

Section: Case 1a Case 1b Case 2amentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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“…The average reaction force ( 0 ) in the streamwise direction of a SJA can be calculated as follows [40,41]:…”

Section: B Synthetic Jet Dynamic Modelmentioning

confidence: 99%

Simplified Steady-State Representation of Slot Synthetic Jet Actuators to Enable Numerical Optimization With Steady RANS Simulations

Battaglioli

James

Gibbons

et al. 2021

IEEE Trans. Compon., Packag. Manufact. Technol.

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To address the growing energy use of data centers, waste heat recuperation offers a solution to better integrate these facilities into the broader energy system, thus facilitating a transition to the decarbonization of the energy system. The use of liquid coolants for full immersion cooling or local heat extraction from high power density components is considered for this purpose. However, heat can also be extracted by novel air cooling approaches, perhaps in combination with localized liquid cooling. To optimize heat extraction from air-cooled systems and maximize the heat grade, synthetic jets can be used for targeted adaptive cooling in conjunction with air ducting to facilitate maximum heat recuperation potential in rack or server-mounted air-to-liquid heat exchangers. Internal server layouts can be optimized numerically, e.g., using a multiple objective genetic algorithm approach based on minimization of entropy generation rates.However, since synthetic jets are inherently transient flow phenomena, this would require transient flow simulations, which form a bottleneck in a numerical optimization loop. This research aims to develop a simplified steady-state representation of a synthetic jet actuator (SJA) with slot orifice using a localized body force to generate a similar time-averaged flow field to a real SJA, suitable for steady Reynolds-averaged Navier Stokes simulations within a numerical optimization loop. Both flow fields are compared in terms of the mean flow field, jet spreading rate, and turbulence intensity distributions.

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“…In the used model, energy efficiency can be understood as a ratio of the timeaverage kinetic energy flux E 0 , calculated from the extrusion stroke with input real power P RMS . For the slug and a sinusoidal model u(t), the energy efficiency can be calculated from [26,30]:…”

Section: Parametersmentioning

confidence: 99%

Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

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The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.

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Synthetic jet actuator efficiency based on the reaction force measurement

Cited by 20 publications

References 19 publications

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Simplified Steady-State Representation of Slot Synthetic Jet Actuators to Enable Numerical Optimization With Steady RANS Simulations

Synthetic jet actuator with two opposite diaphragms

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