elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Quasi-steady simulation of a complete EC-145 helicopter: fuselage + main/tail actuator discs + engines

Le Chuiton, F. (2005) Quasi-steady simulation of a complete EC-145 helicopter: fuselage + main/tail actuator discs + engines. 31st European Rotorcraft Forum, 2005-09-13 - 2005-09-15, Firenze, Italy.

Full text not available from this repository.

Abstract

As concluding activity for quasi-steady computations of the French-German helicopter programme CHANCE, the simulation of engine plumes using boundary conditions is presented. First, the one-dimensional theory of characteristics is used to derive boundary quantities for the Euler equations and also for their preconditioned version for low-velocities (after Choi and Merkle). A slight adaption of the scalar dissipation is also suggested for strong temperature gradients. Then, after the presentation of the EC-145 helicopter configuration, the results of a demonstration computation are presented and commented on. The engine inlet and outlet areas have reached a stable state and exhibit a relatively complex surface flow pattern. It is shown that the plumes of hot gases experience several stretch and distortion phases as they convect downstream from the engine nozzle down to aft the horizontal stabilisers. Also the influence of the downwash of both actuator discs is evidenced in showing how the separation bubble is shifted to the left and how the plume of exhaust gases deforms, thus resulting in only one hot spot on the left horizontal stabiliser instead of one on each side. The pressure distribution on the top centre-line experiences only minor modifications at engine inlet and outlet, whereas the temperature distribution increases along the tail boom. Finally, it is shown that the presence of hot gases impinging on the horizontal stabilisers may reduce the magnitude of the negative lift.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Quasi-steady simulation of a complete EC-145 helicopter: fuselage + main/tail actuator discs + engines
Authors:
AuthorsInstitution or Email of Authors
Le Chuiton, F.UNSPECIFIED
Date:2005
Status:Published
Keywords:engine hot plume, characteristic theory, low-velocity preconditioning
Event Title:31st European Rotorcraft Forum
Event Location:Firenze, Italy
Event Type:international Conference
Event Dates:2005-09-13 - 2005-09-15
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Claudia Grant
Deposited On:11 Jan 2006
Last Modified:14 Jan 2010 19:54

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.