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Aeroelastic Dynamic Stall Computations of a Double-Swept Blade in a Four-Bladed Rotor Configuration

Babij, Georg (2022) Aeroelastic Dynamic Stall Computations of a Double-Swept Blade in a Four-Bladed Rotor Configuration. In: 48th European Rotorcraft Forum, ERF 2022. 48th European Rotorcraft Forum, 06.-08. Sep. 2022, Winterthur, Schweiz. ISBN 978-171387029-6.

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Official URL: https://www.rotorcraft-forum.eu/


Innovative helicopter rotor blades with a combined forward-backward double-sweep at the outer part of the blade enable a reduction in noise emission and enhance the overall performance of a rotor. In this context, the influence of the aeroelastic behaviour in connection with the dynamic stall phenomenon is of great importance. It is accompanied by large aerodynamic load peaks, primarily seen in the lift and the pitching moment, impacting the structural integrity of the blades and adjacent control components. Double-swept model rotor blades were developed and investigated experimentally at the DLR Goettingen regarding the dynamic stall behaviour in a four-bladed rotor configuration at the Rotor Test Facility Goettingen. Due to an axial inflow to the rotor disc a sinusoidal variation in pitch angle is introduced to trigger the dynamic stall behaviour once per revolution. The experimental investigations were accompanied by aeroelastic as well as purely aerodynamic numerical simulations which are the main focus in this study. In case of the aeroelastic simulations, a tight coupling scheme was implemented to perform the data exchange between the inhouse CFD solver TAU and the commercial software Simpack as solver for multibody systems with flexible bodies in each time step. Six test cases with a rotational frequency of 23.6 Hz are presented comprising three with solely collective pitch angle and three with a superposed cyclic variation in pitch angle in order to introduce and strengthen the dynamic stall behaviour stepwise for the investigated rotor configuration. As a result, differences arise in the aerodynamic loads between both blade modelling approaches. They are elaborated in order to draw conclusions about the dynamic stall behaviour under consideration of elasticity in the blade modelling.

Item URL in elib:https://elib.dlr.de/187984/
Document Type:Conference or Workshop Item (Speech)
Title:Aeroelastic Dynamic Stall Computations of a Double-Swept Blade in a Four-Bladed Rotor Configuration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:48th European Rotorcraft Forum, ERF 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Dynamic Stall, Flexible Multibody System, Computational Fluid Dynamics, Rotor Aeroelasticity
Event Title:48th European Rotorcraft Forum
Event Location:Winterthur, Schweiz
Event Type:international Conference
Event Dates:06.-08. Sep. 2022
Organizer:ZHAW Zurich University of Applied Sciences
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Babij, Georg
Deposited On:25 Aug 2022 09:58
Last Modified:04 Sep 2023 09:30

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