Bluff Body Drag Control using Synthetic Jet

Gil, Paweł; Aeronautics, Rzeszow

doi:10.29252/jafm.75.253.28960

Cited by 16 publications

(10 citation statements)

References 33 publications

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“…All computations of the present study are performed on a finite volume method-based commercial solver Ansys-Fluent 18 . Literature 3, [19][20][21][22][23][24] shows that the S-A turbulence model offers significantly good computational results closer to the experimental data. In the S-A turbulence model, one transport equation is solved for variable modified turbulent viscosity ( υ  ).…”

Section: Airfoil Wallmentioning

confidence: 75%

Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

2021

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A time-dependent numerical simulation is performed to examine the flow separation control with the action of a hybrid jet (the combination of synthetic and continuous jets) over a NACA23012 airfoil. The unsteady Reynolds-averaged Navier–Stokes (URANS) simulation is performed with Spalart-Allmaras (SA) turbulence model to simulate the flow field around the airfoil to analyse the effect of the hybrid jet. A combined jet is placed at the point of flow separation on the upper surface of the airfoil which is located at the 12% of the chord length from the leading edge of the airfoil for a given flow configuration. Flow simulations are performed at a chord-based Reynolds number of 2.19 × 106 for the hybrid jet oscillating frequency of 0.159 at a blowing ratio of 3.0. The contribution of the continuous jet in the hybrid jet is evident by the flow control. Variation in the continuous jet velocity is studied, which improved the aerodynamic characteristics of the airfoil. The maximum improvement in lift to drag ratio is observed from 11.19 to 22.14 at an angle of attack of 22 degree. The stall angle also shows an enhancement from 18 degree to 20 degree.

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Section: Airfoil Wallmentioning

confidence: 75%

Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

2021

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“…C D considered to be a quasi-constant value. However, Gil [8] shows that at lower velocities (15 m s −1 ), it does not have linear connection with F D . Furthermore, C D should be a time averaged value, due to vortex shedding.…”

Section: Aerodynamic Dragmentioning

confidence: 95%

Quantitative Analysis of Drag Reduction Methods for Blunt Shaped Automobiles

Szodrai

2020

Applied Sciences

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In fluid mechanics, drag related problems aim to reduce fuel consumption. This paper is intended to provide guidance for drag reduction applications on cars. The review covers papers from the beginning of 2000 to April 2020 related to drag reduction research for ground vehicles. Research papers were collected from the library of Science Direct, Web of Science, and Multidisciplinary Digital Publishing Institute (MDPI). Achieved drag reductions of each research paper was collected and evaluated. The assessed research papers attained their results by wind tunnel measurements or calculating validated numerical models. The study mainly focuses on hatchback and notchback shaped ground vehicle drag reduction methods, such as active and passive systems. Quantitative analysis was made for the drag reduction methods where relative and absolute drag changes were used for evaluations.

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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%

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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Bluff Body Drag Control using Synthetic Jet

Cited by 16 publications

References 33 publications

Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

Quantitative Analysis of Drag Reduction Methods for Blunt Shaped Automobiles

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

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