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The single flapping rotor: detailed physical explanations

Geißler, Wolfgang (2023) The single flapping rotor: detailed physical explanations. CEAS Aeronautical Journal, pp. 1-11. Springer. doi: 10.1007/s13272-023-00669-8. ISSN 1869-5590.

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Official URL: https://link.springer.com/article/10.1007/s13272-023-00669-8


A motor-driven helicopter rotor generates a reaction torque. This torque would accelerate the airframe of the helicopter about the yaw axis opposite to the rotor rotation if no measures are taken to compensate it. In the early days of helicopter development, a diversity of measures was considered: Henrich Focke has discussed these different measures. Not well known is a torque compensation measure which is restricted to only one main rotor, thus skipping the tail rotor or any additional rotor as well. This principle is worth looking into the details of the physical mechanism involved. The German scientist Prof. Hans-Georg Küssner of the AVA-Göttingen, Germany (Aerodynamic Research Institute with heads at this time: L. Prandtl and A. Betz) was the first to study the method successfully. He constructed a wind tunnel model and showed that the reaction torque could indeed be completely compensated. The present author has reviewed Küssner’s experimental data and could show that numerical calculations are in good correspondence with the measured results. In the present paper, the details of the method to compensate the reaction torque will be discussed. Corresponding numerical data will be presented taking into account Navier–Stokes calculations on rotor blade sections. Blade element theory will then be applied and combined with the Navier–Stokes data. Calculated forces and moments of a complete four-bladed helicopter rotor will be presented.

Item URL in elib:https://elib.dlr.de/196199/
Document Type:Article
Title:The single flapping rotor: detailed physical explanations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:15 June 2023
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-11
Keywords:Single fapping rotor, No tail rotor, Pitch/plunge combination, Physical mechanism
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 for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Koch, Bianca
Deposited On:02 Aug 2023 14:43
Last Modified:20 Sep 2023 09:18

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