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Improved solution approach for aerodynamics loads of helicopter rotor blade in forward flight
Bengin, Aleksandar (Author), Mitrović, Časlav (Author), Cvetković, Dragan (Author), Bekrić, Dragoljub (Author), Pešić, Slavko (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-1JYXLHP9 This link opens in a new window

Abstract
V prispevku je predstavljen numerični model, razvit za izračun aerodinamičnih obremenitev lopatice rotorja. Model je nestacionarnega in popolnoma trirazsežen. Predpostavili smo, da je lopatica rotorja toga, njeno gibanje med vrtenjem pa smo modelirali za primer modela rotorja helikopterja "Gazela" Aerospatiale SA 341 (lopatica je pritrjena v sredisče z loputo in tečaji). Tokovno polje okrog lopatice smo opazovali v sosledju večih azimutnih leg. Tokovno polje okrog rotorja helikopterja smo modelirali kot popolnoma trirazsežnega, neustaljenega in potencialnega. Aerodinamiko lopatic smo modelirali z uporabo dvižnega površinskega modela. Vrtinec rotorja se sestoji iz premih elementov s stalno vrtilnostjo, ki izhaja iz roba pri stalnih kotih azimuta. Ti vrtinci predstavljajo tako vlečne kot tudi sled zagonske komponente in se lahko prosto prenašajo vzdolž krajevnih vektorjev hitrosti. Vrtinec smo modelirali kot neodvisnega, njegovo obliko pa lahko v določenih trenutkih izračunamo iz enostavnih kinematičnih zakonov, uporabljenih na kolokacijskih točkah vrtinca. Zmaličenje vrtinca smo izračunali le v polju blizu rotorja, tj. pri končnem številu vrtljajev rotorja. Elemente vrtinca smo modelirali z jedrom vrtinca. Predpostavili smo, da je jedro vrtinca neodvisno od časa ter da je odvisno od spremembe kroženja v točki, v kateri se element vrtinca odlepi od lopatice.

Language:English
Keywords:unsteady aerodynamics, helicopter rotor blade, potential flow, lifting surface theory
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2008
Publisher:= Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:str. 170-178
Numbering:Letn. 54, št. 3
UDC:533.661
ISSN on article:0039-2480
COBISS.SI-ID:10524443 Link is opened in a new window
Views:335
Downloads:155
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Secondary language

Language:Slovenian
Title:Izboljšan postopek reševanja aerodinamičnih obremenitev lopatice rotorja helikopterja pri letenju naprej
Abstract:
This paper presents the numerical model developed for rotor blade aerodynamicsloads calculation. The model is unsteady and fully three-dimensional. Helicopter blade is assumed to be rigid, and its motion during rotation is modeled in the manner that rotor presents a model of rotor of helicopter Aerospatiale SA 341 "Gazelle" (the blade is attached to the hub by flap, pitch and pseudo lead-lag hinges). Flow field around the blade is observed in succession of several azimuth locations. Flow field around helicopter rotor is modeled as fully three-dimensional, unsteady and potential. Blade aerodynamics is modeled using a lifting surface model. Rotor wake is generated from the straight elements of constant vorticity, released from the trailing edge, at fixed azimuth angles. These vortices represent bothtrailed and shed wake components, and are allowed to freely convect along local velocity vectors. Wake is modeled as free one, and its shape at certain moment can be calculated from simple kinematics laws applied on collocation points of the wake. Wake distortion is calculated only in the rotor near-field, i.e. in finite number of rotor revolutions. Vortex elements are modeled with vortex core. The radius of the vortex core is assumed independentof time, and it depends on circulation gradient at the point of vortex element released from the blade.

Keywords:neustaljena aerodinamika, helikopterji, lopatice rotorjev, potencialni tok, dvižne površine

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