Calculations of vortex ring states and autorotation in helicopter rotor flow fields

O. Inoue; Y. Hattori; K. Akiyama

Calculations of vortex ring states and autorotation in helicopter rotor flow fields

O. Inoue, Y. Hattori, K. Akiyama

IFS - Complex Flow Research Division

Research output: Contribution to conference › Paper › peer-review

Abstract

Unsteady flow fields, from hover to windmill brake state, of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. "Vortex ring state" is captured for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The aerodynamic characteristics are in good qualitative agreements with experiments. "Autorotation" is also captured for a low collective pitch angle and a large descent velocity.

Original language	English
Publication status	Published - 1997
Event	28th Fluid Dynamics Conference, 1997 - Snowmass Village, United States Duration: 1997 Jun 29 → 1997 Jul 2

Conference

Conference	28th Fluid Dynamics Conference, 1997
Country/Territory	United States
City	Snowmass Village
Period	97/6/29 → 97/7/2

Cite this

@conference{5aac5dfec0fc4a6798f7443e51f20c81,

title = "Calculations of vortex ring states and autorotation in helicopter rotor flow fields",

abstract = "Unsteady flow fields, from hover to windmill brake state, of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. {"}Vortex ring state{"} is captured for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The aerodynamic characteristics are in good qualitative agreements with experiments. {"}Autorotation{"} is also captured for a low collective pitch angle and a large descent velocity.",

author = "O. Inoue and Y. Hattori and K. Akiyama",

note = "Publisher Copyright: {\textcopyright} 1997 by O. Inoue.; 28th Fluid Dynamics Conference, 1997 ; Conference date: 29-06-1997 Through 02-07-1997",

year = "1997",

language = "English",

}

TY - CONF

T1 - Calculations of vortex ring states and autorotation in helicopter rotor flow fields

AU - Inoue, O.

AU - Hattori, Y.

AU - Akiyama, K.

PY - 1997

Y1 - 1997

N2 - Unsteady flow fields, from hover to windmill brake state, of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. "Vortex ring state" is captured for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The aerodynamic characteristics are in good qualitative agreements with experiments. "Autorotation" is also captured for a low collective pitch angle and a large descent velocity.

AB - Unsteady flow fields, from hover to windmill brake state, of a model helicopter rotor are studied by direct numerical simulations of the three-dimensional, compressible Euler equations. "Vortex ring state" is captured for the case of a descent velocity close to the average downward velocity in hover, and the existence of a vortex ring in this state is confirmed. The aerodynamic characteristics are in good qualitative agreements with experiments. "Autorotation" is also captured for a low collective pitch angle and a large descent velocity.

UR - http://www.scopus.com/inward/record.url?scp=84964285771&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964285771&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:84964285771

T2 - 28th Fluid Dynamics Conference, 1997

Y2 - 29 June 1997 through 2 July 1997

ER -

Calculations of vortex ring states and autorotation in helicopter rotor flow fields

Abstract

Conference

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