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A panel free-wake code with boundary layer method for helicopter simulations

Kunze, Philipp (2019) A panel free-wake code with boundary layer method for helicopter simulations. 45th European Rotorcraft Forum, 17.-20. Sep. 2019, Warschau, Polen.

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UPM, DLR's unsteady panel and free-wake code for helicopter simulations, is being modernized and extended in order to provide a modern mid-fidelity tool suitable to support the industrial helicopter development process. Two major tasks in this process were the implementation of approximate boundary layer analysis methods and the calculation of unsteady pressures on arbitrary bodies. This paper shortly describes UPM and the newly implemented methods. Then, results of verification and validation calculations are presented, including isolated airfoil, wing, rotor and fuselage test cases. Finally, a complete helicopter configuration is simulated and compared to experimental wind tunnel results of the GOAHEAD campaign. The results show that the approximate boundary layer methods are able to identify flow separation regions and provide reasonable friction force estimates for a wide range of applications. Nevertheless, the limits of the methods become apparent in cases where viscous effects lead to strong nonlinear behavior. The complete helicopter simulation also shows a good agreement with experimental data in general. But here, too, individual flow regions reveal the limits of the underlying theory. If these limits are kept in mind, UPM can be a valuable tool and support the helicopter development process in many regards.

Item URL in elib:https://elib.dlr.de/131896/
Document Type:Conference or Workshop Item (Speech)
Title:A panel free-wake code with boundary layer method for helicopter simulations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:September 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Helicopter, Aerodynamics, 3D panel method, Free-wake method, Integral boundary layer analysis, Aerodynamic interactions
Event Title:45th European Rotorcraft Forum
Event Location:Warschau, Polen
Event Type:international Conference
Event Dates:17.-20. Sep. 2019
Organizer:Warsaw University of Technology
HGF - Research field:Aeronautics, Space and Transport
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, BS
Deposited By: Kunze, Philipp
Deposited On:09 Dec 2019 15:02
Last Modified:14 Apr 2020 10:07

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