A study on rotational augmentation using CFD analysis of flow in the inboard region of the MEXICO rotor blades

Srinivas Guntur, Niels N. Sørensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This work presents an analysis of data from existing as well as new full-rotor computational fluid dynamics computations on the MEXICO rotor, with focus on the flow around the inboard parts of the blades. The boundary layer separation characteristics on the airfoil sections in the inboard parts of the rotor are analysed using the pressure and the skin friction data at a range of angles of attack. These data are used to gain insight on the relative behaviour of separated boundary layers in 3D flow compared with 2D flow. It has been found that separation on airfoils in rotating flows is different from that in 2D flows in two respects: (i) there is a chord-wise postponement (or delay) of the separation point, and (ii) the angle of attack at which separation is initiated is higher in 3D compared with 2D. Comments are made on the mechanism of stall delay, and the main differences between the skin friction and pressure distribution behaviours in 2D and 3D rotating flows are highlighted. Copyright © 2014 John Wiley & Sons, Ltd.
Original languageEnglish
JournalWind Energy
Volume18
Issue number4
Pages (from-to)745–756
ISSN1095-4244
DOIs
Publication statusPublished - 2015

Cite this

@article{5946caea7b994bc49375fc7d5302a487,
title = "A study on rotational augmentation using CFD analysis of flow in the inboard region of the MEXICO rotor blades",
abstract = "This work presents an analysis of data from existing as well as new full-rotor computational fluid dynamics computations on the MEXICO rotor, with focus on the flow around the inboard parts of the blades. The boundary layer separation characteristics on the airfoil sections in the inboard parts of the rotor are analysed using the pressure and the skin friction data at a range of angles of attack. These data are used to gain insight on the relative behaviour of separated boundary layers in 3D flow compared with 2D flow. It has been found that separation on airfoils in rotating flows is different from that in 2D flows in two respects: (i) there is a chord-wise postponement (or delay) of the separation point, and (ii) the angle of attack at which separation is initiated is higher in 3D compared with 2D. Comments are made on the mechanism of stall delay, and the main differences between the skin friction and pressure distribution behaviours in 2D and 3D rotating flows are highlighted. Copyright {\circledC} 2014 John Wiley & Sons, Ltd.",
author = "Srinivas Guntur and S{\o}rensen, {Niels N.}",
year = "2015",
doi = "10.1002/we.1726",
language = "English",
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pages = "745–756",
journal = "Wind Energy",
issn = "1095-4244",
publisher = "JohnWiley & Sons Ltd.",
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A study on rotational augmentation using CFD analysis of flow in the inboard region of the MEXICO rotor blades. / Guntur, Srinivas; Sørensen, Niels N.

In: Wind Energy, Vol. 18, No. 4, 2015, p. 745–756.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - A study on rotational augmentation using CFD analysis of flow in the inboard region of the MEXICO rotor blades

AU - Guntur, Srinivas

AU - Sørensen, Niels N.

PY - 2015

Y1 - 2015

N2 - This work presents an analysis of data from existing as well as new full-rotor computational fluid dynamics computations on the MEXICO rotor, with focus on the flow around the inboard parts of the blades. The boundary layer separation characteristics on the airfoil sections in the inboard parts of the rotor are analysed using the pressure and the skin friction data at a range of angles of attack. These data are used to gain insight on the relative behaviour of separated boundary layers in 3D flow compared with 2D flow. It has been found that separation on airfoils in rotating flows is different from that in 2D flows in two respects: (i) there is a chord-wise postponement (or delay) of the separation point, and (ii) the angle of attack at which separation is initiated is higher in 3D compared with 2D. Comments are made on the mechanism of stall delay, and the main differences between the skin friction and pressure distribution behaviours in 2D and 3D rotating flows are highlighted. Copyright © 2014 John Wiley & Sons, Ltd.

AB - This work presents an analysis of data from existing as well as new full-rotor computational fluid dynamics computations on the MEXICO rotor, with focus on the flow around the inboard parts of the blades. The boundary layer separation characteristics on the airfoil sections in the inboard parts of the rotor are analysed using the pressure and the skin friction data at a range of angles of attack. These data are used to gain insight on the relative behaviour of separated boundary layers in 3D flow compared with 2D flow. It has been found that separation on airfoils in rotating flows is different from that in 2D flows in two respects: (i) there is a chord-wise postponement (or delay) of the separation point, and (ii) the angle of attack at which separation is initiated is higher in 3D compared with 2D. Comments are made on the mechanism of stall delay, and the main differences between the skin friction and pressure distribution behaviours in 2D and 3D rotating flows are highlighted. Copyright © 2014 John Wiley & Sons, Ltd.

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DO - 10.1002/we.1726

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VL - 18

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EP - 756

JO - Wind Energy

JF - Wind Energy

SN - 1095-4244

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ER -