Numerical Investigation of Jet Angle Effect on Airfoil Stall Control

Numerical Investigation of Jet Angle Effect on Airfoil Stall Control

Numerical study on flow separation control is conducted for a stalled airfoil with steady-blowing jet. Stall conditions relevant to a rotorcraft are of interest here. Both static and dynamic stalls are simulated with solving compressible Reynolds-averaged Navier-Stokes equations. It is expected that...

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Main Authors: Junkyu Kim, Young Min Park, Junseong Lee, Taesoon Kim, Minwoo Kim, Jiseop Lim, Solkeun Jee
Format: Article
Language:English
Published: MDPI AG 2019-07-01
Series:Applied Sciences
Subjects:
flow separation control
steady-blowing jet
jet angle
static stall
dynamic stall
Online Access:https://www.mdpi.com/2076-3417/9/15/2960
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spelling doaj-a3b08ead29754a2898b548fa15c0b58a2020-11-25T01:18:49ZengMDPI AGApplied Sciences2076-34172019-07-01915296010.3390/app9152960app9152960Numerical Investigation of Jet Angle Effect on Airfoil Stall ControlJunkyu Kim0Young Min Park1Junseong Lee2Taesoon Kim3Minwoo Kim4Jiseop Lim5Solkeun Jee6School of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Mechanical Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaNumerical study on flow separation control is conducted for a stalled airfoil with steady-blowing jet. Stall conditions relevant to a rotorcraft are of interest here. Both static and dynamic stalls are simulated with solving compressible Reynolds-averaged Navier-Stokes equations. It is expected that a jet flow, if it is applied properly, provides additional momentum in the boundary layer which is susceptible to flow separation at high angles of attack. The jet angle can influence on the augmentation of the flow momentum in the boundary layer which helps to delay or suppress the stall. Two distinct jet angles are selected to investigate the impact of the jet angle on the control authority. A tangential jet with a shallow jet angle to the surface is able to provide the additional momentum to the flow, whereas a chord-normal jet with a large jet angle simply averts the external flow. The tangential jet reduces the shape factor of the boundary layer, lowering the susceptibility to the flow separation and delaying both the static and dynamic stalls.https://www.mdpi.com/2076-3417/9/15/2960flow separation controlsteady-blowing jetjet anglestatic stalldynamic stall
collection DOAJ
language English
format Article
sources DOAJ
author Junkyu Kim
Young Min Park
Junseong Lee
Taesoon Kim
Minwoo Kim
Jiseop Lim
Solkeun Jee
spellingShingle Junkyu Kim
Young Min Park
Junseong Lee
Taesoon Kim
Minwoo Kim
Jiseop Lim
Solkeun Jee
Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
Applied Sciences
flow separation control
steady-blowing jet
jet angle
static stall
dynamic stall
author_facet Junkyu Kim
Young Min Park
Junseong Lee
Taesoon Kim
Minwoo Kim
Jiseop Lim
Solkeun Jee
author_sort Junkyu Kim
title Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
title_short Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
title_full Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
title_fullStr Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
title_full_unstemmed Numerical Investigation of Jet Angle Effect on Airfoil Stall Control
title_sort numerical investigation of jet angle effect on airfoil stall control
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2019-07-01
description Numerical study on flow separation control is conducted for a stalled airfoil with steady-blowing jet. Stall conditions relevant to a rotorcraft are of interest here. Both static and dynamic stalls are simulated with solving compressible Reynolds-averaged Navier-Stokes equations. It is expected that a jet flow, if it is applied properly, provides additional momentum in the boundary layer which is susceptible to flow separation at high angles of attack. The jet angle can influence on the augmentation of the flow momentum in the boundary layer which helps to delay or suppress the stall. Two distinct jet angles are selected to investigate the impact of the jet angle on the control authority. A tangential jet with a shallow jet angle to the surface is able to provide the additional momentum to the flow, whereas a chord-normal jet with a large jet angle simply averts the external flow. The tangential jet reduces the shape factor of the boundary layer, lowering the susceptibility to the flow separation and delaying both the static and dynamic stalls.
topic flow separation control
steady-blowing jet
jet angle
static stall
dynamic stall
url https://www.mdpi.com/2076-3417/9/15/2960
work_keys_str_mv AT junkyukim numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT youngminpark numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT junseonglee numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT taesoonkim numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT minwookim numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT jiseoplim numericalinvestigationofjetangleeffectonairfoilstallcontrol
AT solkeunjee numericalinvestigationofjetangleeffectonairfoilstallcontrol
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