Evaluation and Parameterization of Round Vortex Generator Jet Experiments for Flow Control

Stillfried, Florian von; Wallin, Stefan; Johansson, A.; Casper, Marcus; Ortmanns, Jens

doi:10.2514/1.j051694

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…A maximum loss reduction up to 28.4% relative to the baseline case is provided by the VGJ with a pitch angle of =20º and a yaw angle of β=0º. In external flow field, it has been concluded that the VGJ with the pitch angle ranging from 15º to 45º and the skew angle between 45º and 90º could obtain the optimal benefit on vortex generation and separation control, as shown by Zhang et al (2014) and Stillfried et al (2012). Therefore, the similar tendency is observed in this work, where an optimal yaw angle of β=0º corresponds to a skew angle of 48º against the inflow.…”

Section: Impact Of Vgj Orientationmentioning

confidence: 69%

A parametric investigation of endwall vortex generator jet on the secondary flow control for a high turning compressor cascade

Liu

Chen

et al. 2017

JTST

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Section: Impact Of Vgj Orientationmentioning

confidence: 69%

A parametric investigation of endwall vortex generator jet on the secondary flow control for a high turning compressor cascade

Liu

Chen

et al. 2017

JTST

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“…For a deeper analysis we follow the approach of parameterisation, which was originally published in a series of contributions (31-33) . They develop a statistical model for VGJs, based on the idea that the vortex is similar to a Lamb-Oseen vortex.…”

Section: Momentum Rearrangementmentioning

confidence: 99%

“…In contrast, the VGJs are small structures in the boundary layer, which would require excessive grid resolution (25,29) . An approach to circumvent this problem was devised by the Stockholm research group, using the parameterisation (33) already discussed in Section 3.4, and formulating a model (31) that respects the integral features of the vortices (the Reynolds stresses and/or turbulent kinetic energy) in a spanwisely averaged sense. This model was calibrated by simulations with fully resolved VGJ structures (32) .…”

Section: Momentum Rearrangementmentioning

confidence: 99%

Active flow control for high lift with steady blowing

et al. 2016

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The general picture of research in active flow control for aircraft applications has been continuously changing over the last 20 years. Researchers can now obtain design sensitivities by using numerical flow simulations, and new optical experimental methods can be used that measure flow field data non-intrusively in planes and volumes. These methodological advances enabled significant knowledge increase. The present paper reviews recent progress in active flow control by steady blowing. It appears that two strategies of blowing deserve particular attention. The first uses tangential blowing of thin wall jets to overcome the adverse pressure gradients from locally very large flow turning rates. This approach exploits the potentials of the Coanda effect. The second strategy employs oblique blowing of air jets designed to generate longitudinal vortices in the boundary layer. The longitudinal vortices provide convective redistribution of momentum in the boundary layer, and they also enhance turbulent momentum transport. The sensitivities of these two approaches as observed in fundamental flow investigations and in applications to high-lift aerofoils are described and suited efficiency parameters of blowing are analysed.

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“…Also, the mixing is effected large-scale momentum transport. Von Stillfried et al 12 reported that the actual boundary-layer conditions and many combinations are possible very important in the optimizing parameters of VGJs. According to this investigation, optimum ranges for the pitch angle and skew angle are between 15°–45° and 90°–135°, respectively.…”

Section: Introductionmentioning

confidence: 99%

The effects of minute vortex generator jet in a turbulent boundary layer with adverse pressure gradient

Razzaghi

Liu

et al. 2021

Science Progress

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Experimental and numerical analysis of active and passive flow control is an important topic of practical value in the study of turbulent flows. This paper numerically analyzed the effects of an air microjet on an adverse pressure gradient turbulent boundary layer over a flat plane. Experimental data were employed to verify the numerical modeling. Vortex formation and development were then studied by changing the microjet to inflow velocity ratio (VR) and microjet angles. According to the results, the best values of the angles [Formula: see text] and [Formula: see text] for various velocities were found to be 30° and from 60° to 90°, respectively. Moreover, at VRs = 1, 2, and 4, the [Formula: see text] values (the distance at which the complete vortex persisted in the flow) were 0.058, 0.078, and 0.18, respectively. Compared to VR = 1, the vortex strength for VRs = 2 and 4 grew by 3.5 and 6.8 times, respectively. When the microjet was added to the flow, the highest variation in the Reynolds stress along the x-direction from VR = 1–4 was 10%. The corresponding values along the y and z- directions were 15% and 2.7 times, respectively.

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Evaluation and Parameterization of Round Vortex Generator Jet Experiments for Flow Control

Cited by 11 publications

References 24 publications

A parametric investigation of endwall vortex generator jet on the secondary flow control for a high turning compressor cascade

A parametric investigation of endwall vortex generator jet on the secondary flow control for a high turning compressor cascade

Active flow control for high lift with steady blowing

The effects of minute vortex generator jet in a turbulent boundary layer with adverse pressure gradient

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