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Extension of a helicopter aerodynamics model by unsteady stall effects

Asif, Shaik (2022) Extension of a helicopter aerodynamics model by unsteady stall effects. DLR-Interner Bericht. DLR-IB-FT-BS-2022-110. Student thesis. TU Braunschweig. 69 S.

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Presently a comprehensive simulation program for the aeromechanics of helicopters named VAST - Versatile Aeromechanics Simulation Tool - is being developed by the Institute of Flight Systems of DLR. This work aims to include the indicial response model to compute the 2D airfoil lift, pitching moment, and chord force for rotor air loads prediction in VAST. Leishman and Crouse developed the state-space formulation for Leishman and Beddoe's indicial response method. The state-space formulation accounts for the attached and separated flow and respective circulatory and non-circulatory loading effects. Non-linear effects produced due to the Trailing Edge Separation (TES) are accounted by modifying the Kirchhoff flow. The onset of the Leading Edge Separation (LES) or Shock-induced separation was denoted by a generalized criterion. However, the VAST model uses two extra states. One to track the non-dimensional vortex travel time and another for the track direction of airfoil pitching. To get the progressive transition from the vortex lift strength accumulation and exponential decay. The results are validated with experimental data and the Leishman-Crouse model data for stall onset, moderate and deep dynamic stall conditions from Leishman-Crouse, and a reasonable to a good agreement was found.

Item URL in elib:https://elib.dlr.de/190698/
Document Type:Monograph (DLR-Interner Bericht, Student thesis)
Title:Extension of a helicopter aerodynamics model by unsteady stall effects
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:12 September 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:69
Keywords:VAST, Dynamic Stall, Leishman-Beddoes, Indicial Method
Institution:TU Braunschweig
Department:Computational Sciences in Engineering
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: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Institute of Flight Systems
Deposited By: Mindt, Maximilian
Deposited On:29 Nov 2022 17:52
Last Modified:29 Nov 2022 17:52

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