Passive flow control for aerodynamic performance enhancement of airfoil with its application in Wells turbine – under oscillating flow condition

Ahmed S. Shehata, Qing Xiao, Khalid M. Saqr, Ahmed Naguib , Alexander Day

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this work, the passive flow control method was applied to improve the performance of symmetrical airfoil section in the stall regime. In addition to the commonly used first law analysis, the present study utilized an entropy generation minimization method to examine the impact of the flow control method on the entropy generation characteristics around the turbine blade. This work is performed using a time-dependent CFD model of isolated NACA airfoil, which refers to the turbine blade, under sinusoidal flow boundary conditions, which emulates the actual operating conditions. Wells turbine is one of the most proper applications that can be applied by passive flow control method because it is subjected to early stall. Additionally, it consists of a number of blades that have a symmetrical airfoil section subject to the wave condition. It is deduced that with the use of passive flow control, torque coefficient of blade increases by more than 40% within stall regime and by more than 17% before the stall happens. A significantly delayed stall is also observed.
LanguageEnglish
Pages31-53
Number of pages23
JournalOcean Engineering
Volume136
Early online date17 Mar 2017
DOIs
Publication statusPublished - 15 May 2017

Fingerprint

Oscillating flow
Airfoils
Flow control
Aerodynamics
Turbines
Turbomachine blades
Entropy
Computational fluid dynamics
Torque
Boundary conditions

Keywords

  • sinusoidal flow
  • wells turbine
  • passive flow control method
  • entropy generation
  • stall regime
  • large eddy simulation

Cite this

@article{280f5f5277c542048a303eab69d1ff22,
title = "Passive flow control for aerodynamic performance enhancement of airfoil with its application in Wells turbine – under oscillating flow condition",
abstract = "In this work, the passive flow control method was applied to improve the performance of symmetrical airfoil section in the stall regime. In addition to the commonly used first law analysis, the present study utilized an entropy generation minimization method to examine the impact of the flow control method on the entropy generation characteristics around the turbine blade. This work is performed using a time-dependent CFD model of isolated NACA airfoil, which refers to the turbine blade, under sinusoidal flow boundary conditions, which emulates the actual operating conditions. Wells turbine is one of the most proper applications that can be applied by passive flow control method because it is subjected to early stall. Additionally, it consists of a number of blades that have a symmetrical airfoil section subject to the wave condition. It is deduced that with the use of passive flow control, torque coefficient of blade increases by more than 40{\%} within stall regime and by more than 17{\%} before the stall happens. A significantly delayed stall is also observed.",
keywords = "sinusoidal flow, wells turbine, passive flow control method, entropy generation, stall regime, large eddy simulation",
author = "Shehata, {Ahmed S.} and Qing Xiao and Saqr, {Khalid M.} and Ahmed Naguib and Alexander Day",
year = "2017",
month = "5",
day = "15",
doi = "10.1016/j.oceaneng.2017.03.010",
language = "English",
volume = "136",
pages = "31--53",
journal = "Ocean Engineering",
issn = "0029-8018",
publisher = "Elsevier",

}

TY - JOUR

T1 - Passive flow control for aerodynamic performance enhancement of airfoil with its application in Wells turbine – under oscillating flow condition

AU - Shehata, Ahmed S.

AU - Xiao, Qing

AU - Saqr, Khalid M.

AU - Naguib , Ahmed

AU - Day, Alexander

PY - 2017/5/15

Y1 - 2017/5/15

N2 - In this work, the passive flow control method was applied to improve the performance of symmetrical airfoil section in the stall regime. In addition to the commonly used first law analysis, the present study utilized an entropy generation minimization method to examine the impact of the flow control method on the entropy generation characteristics around the turbine blade. This work is performed using a time-dependent CFD model of isolated NACA airfoil, which refers to the turbine blade, under sinusoidal flow boundary conditions, which emulates the actual operating conditions. Wells turbine is one of the most proper applications that can be applied by passive flow control method because it is subjected to early stall. Additionally, it consists of a number of blades that have a symmetrical airfoil section subject to the wave condition. It is deduced that with the use of passive flow control, torque coefficient of blade increases by more than 40% within stall regime and by more than 17% before the stall happens. A significantly delayed stall is also observed.

AB - In this work, the passive flow control method was applied to improve the performance of symmetrical airfoil section in the stall regime. In addition to the commonly used first law analysis, the present study utilized an entropy generation minimization method to examine the impact of the flow control method on the entropy generation characteristics around the turbine blade. This work is performed using a time-dependent CFD model of isolated NACA airfoil, which refers to the turbine blade, under sinusoidal flow boundary conditions, which emulates the actual operating conditions. Wells turbine is one of the most proper applications that can be applied by passive flow control method because it is subjected to early stall. Additionally, it consists of a number of blades that have a symmetrical airfoil section subject to the wave condition. It is deduced that with the use of passive flow control, torque coefficient of blade increases by more than 40% within stall regime and by more than 17% before the stall happens. A significantly delayed stall is also observed.

KW - sinusoidal flow

KW - wells turbine

KW - passive flow control method

KW - entropy generation

KW - stall regime

KW - large eddy simulation

UR - http://www.sciencedirect.com/science/article/pii/S0029801817301233

U2 - 10.1016/j.oceaneng.2017.03.010

DO - 10.1016/j.oceaneng.2017.03.010

M3 - Article

VL - 136

SP - 31

EP - 53

JO - Ocean Engineering

T2 - Ocean Engineering

JF - Ocean Engineering

SN - 0029-8018

ER -