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    Wyświetlanie 1-4 z 4
    Tytuł:
    Numerical simulation of model helicopter rotor in hover
    Autorzy:
    Doerffer, P.
    Szulc, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943245.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    transonic
    hover
    helicopter rotor
    Opis:
    The article presents details of a URANS simulation of the flow field near a hovering model of the Caradonna and Tung (1981) helicopter rotor [1]. The CFD code SPARC [2] proves to be capable of capturing the aerodynamics of a two-bladed rotor in high-speed transonic hover conditions. A comparison of the simulation results with the experimental data is acceptable, hence the described methodology might be used with confidence in future numerical studies of application of noise-reducing devices on helicopter blades.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 227-236
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational simulation of fully trimmed flight of a helicopter in hover
    Autorzy:
    Stalewski, Wieńczysław
    Zalewski, Wiesław
    Surmacz, Katarzyna
    Pulfer, Maximilian
    Hirsch, Frieder
    Powiązania:
    https://bibliotekanauki.pl/articles/241633.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    helicopter flight simulation
    hover
    trimmed flight
    URANS
    Opis:
    In trimmed flight of a helicopter, all the forces and moments, aerodynamic, inertial, and gravitational, are in balance. Keeping the helicopter in trimmed state, needs a precise adjustment of flight controls. The methodology of simulation of a fully trimmed flight of rotorcraft has been developed and applied to simulate hover of a helicopter. The presented approach is based on a solution of Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations. In contrast to typical solutions of such problem, in the newly developed methodology, the flight controls corresponding to the trimmed-flight conditions are also determined based on the solution of URANS equations. The methodology is based on coupling of several computational models of Computational Fluid Dynamics and Flight Dynamic. The URANS equations are solved in a three-dimensional region surrounding the flying helicopter, using the ANSYS FLUENT code. The approach is truly three-dimensional, with truly modelled geometry and kinematics of main and tail rotor blades. This applies to modelling of blade flapping and lead-lag motion, too. The trimming procedure uses six independent parameters (i.e. collective and cyclic pitch of main rotor blades, collective pitch of tail rotor blades, pitch, and bank angles of a helicopter) that should be adjusted so as to balance all forces and moments acting on the helicopter. The detailed description of the developed methodology as well as the results of simulation of trimmed hover of the helicopter was presented.
    Źródło:
    Journal of KONES; 2019, 26, 1; 175-181
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passive control of shock wave applied to helicopter rotor high-speed impulsive noise reduction
    Autorzy:
    Doerffer, P.
    Szulc, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943208.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    shock wave
    passive control
    perforated wall
    transpiration
    helicopter rotor in hover
    high-speed impulsive noise
    Opis:
    A strong, normal shock wave, terminating a local supersonic area on an airfoil (or a helicopter blade), not only limits the aerodynamic performance, but also becomes a source of High-Speed Impulsive (HSI) noise. The application of a passive control system (a cavity covered by a perforated plate) on a rotor blade should reduce the noise created by the moving shock. This article describes numerical investigations focused on the application of a passive control device on a helicopter blade in high-speed transonic hover conditions to weaken the shock wave – the main source of HSI noise.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 297-305
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The occurrence of Syrphidae in Aphis fabae Scop. (Hemiptera) colonies on broad bean intercropped with Phacelia (Part II)
    Autorzy:
    Wojciechowicz-Zytko, E.
    Wnuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/65985.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    occurrence
    Syrphidae
    Aphis fabae
    Hemiptera
    hover fly
    black bean aphid
    colony
    broad bean
    intercropping
    Phacelia tanacetifolia
    Vicia faba
    Opis:
    During the 2008-2009 time period, the effect of phacelia grown with broad bean on the presence of Syrphidae in colonies of Aphis fabae Scop. as well as the attractiveness of phacelia flowers for syrphid adults was researched. In A. fabae colonies, 9 Syrphidae species were collected. On plots with phacelia, less aphids and more syrphid larvae, compared to the homogenous crop, were observed. The dominant species were: Episyrphus balteatus, Shaerophoria scipta, Syrphus ribesii and Epistrophe eligans. Among the 9 species of Syrphidae collected from tansy phacelia flowers, the same species dominated as those noted in A. fabae colonies on broad beans intercropped with phacelia. Sowing plants of value to Syrphidae, such as phacelia, is probably the ideal habitat management option for early occurrence of syrphids. Such a practice result in the reduction in crop damage by aphids.
    Źródło:
    Journal of Plant Protection Research; 2012, 52, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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