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    Wyświetlanie 1-4 z 4
    Tytuł:
    Simulations of hot-gas flow in internally cooled cascade of turbine vanes
    Autorzy:
    Sznajder, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/242679.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aircraft engines
    mechanical engineering
    engine parts
    simulation and modelling
    Opis:
    An experiment in cooling of gas turbine nozzle guide vanes was modelled numerically with a conjugate viscousflow and solid-material heat conduction solver. The nozzle vanes were arranged in a cascade and operated in highpressure, hot-temperature conditions, typical for first turbine stage in a flow of controlled-intensity, artificiallygenerated turbulence. The vane cooling was internal, accomplished by 10 channels in each vane with cooling-air flow. Numerical simulations of the experiment were conducted applying two turbulence models of the k-omega family: k-omega-SST and Transition SST implemented in the ANSYS Fluent solver. Boundary conditions for the simulations were set based on conditions of experiment: total pressures and total temperature on inlet to cascade, static pressure on the outlet of the cascade and heat flux on the surface of cooling channels. The values of heat flux on the surface of cooling channels were evaluated based on Nusselt numbers obtained from experiment and varied in time until steadystate conditions were obtained. Two test cases, one with subcritical outlet flow, and another one, with supercritical outlet flow were simulated. The result of experiment – distributions of pressure, surface temperature, and heat transfer coefficients on the vane external surface were compared to results of numerical simulations. Sensitivity of the vane surface temperatures and heat transfer coefficients to turbulence models and to boundary-condition values of parameters of turbulence models: turbulence energy and specific dissipation of turbulence energy was also studied.
    Źródło:
    Journal of KONES; 2019, 26, 2; 151-158
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of vane and rotor blade rows in simulations of gas turbine performance
    Autorzy:
    Sznajder, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/244955.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aircraft engines
    mechanical engineering
    engine parts
    simulation
    modelling
    Opis:
    A method of modelling of nozzle and rotor blade rows of gas turbine dedicated to simulations of gas turbine performance is proposed. The method is applicable especially in early design stage when many of geometric parameters are yet subject to change. The method is based on analytical formulas derived from considerations of flow theory and from cascade experiments. It involves determination of parameters of gas flow on the mean radius of blade rows. The blade row gas exit angle, determined in turbine design point is a basis for determination of details of blade contour behind the throat position. Throat area is then fixed based on required maximum mass flow in critical conditions. Blade leading edge radius is determined based on flow inlet angle to the blade row in the design point. The accuracy of analytical formulas applied for definition of blade contour details for assumed gas exit angle was verified by comparing the results of analytical formulas with CFD simulations for an airfoil cascade. Losses of enthalpy due to non-isentropic gas flow are evaluated using the analytical model of Craig and Cox, based on cascade experiments. Effects of blade cooling flows on losses of total pressure of the gas are determined based on analytical formulas applicable to film cooling with cooling streams blowing from discrete point along blade surface, including leading and trailing edges. The losses of total pressure due to film cooling of blades are incorporated into the Craig and Cox model as additional factor modifying gas flow velocities.
    Źródło:
    Journal of KONES; 2019, 26, 1; 183-190
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Modelling of Static Aeroelastic Deformations of Slender Wing in Aerodynamic Design
    Autorzy:
    Bugała, Pamela
    Sznajder, Janusz
    Sieradzki, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/36831212.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    aeroelasticity
    static analysis
    beam model
    radial basis functions
    Opis:
    The article presents the validation of two methods for analyzing the aerodynamic properties of the aircraft wing concerning aeroelastic effects. The first method is based on low-cost computational models (Euler-Bernoulli Beam Model and Vortex Lattice Method [VLM]). Its primary objective is to estimate the wing’s deformation early in the design stages and during the automatic optimization process. The second one is a method that uses solutions of unsteady Navier-Stokes equations (URANS). This method suits early design, particularly for unconventional designs or flight conditions exceeding low-fidelity method limits. The coupling of the flow and structural models was done by Radial Basis Functions implemented as a user-defined module in the ANSYS Fluent solver. The structural model has variants for linear and nonlinear wing deformations. Features enhancing applicability for real-life applications, such as the definition of deformable and nondeformable mesh zones with smooth transition between them, have been included in this method. A rectangular wing of a high-altitude long-endurance (HALE) aeroplane, built based on the NACA 0012 profile, was used to validate both methods. The resulting deflections and twists of the wing have been compared with reference data for the linear and nonlinear variants of the model.
    Źródło:
    Transactions on Aerospace Research; 2023, 4 (273); 52-70
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrition accesses among patients receiving enteral treatment in the home environment
    Autorzy:
    Sznajder, Janusz
    Ślefarska-Wasilewska, Marta
    Wójcik, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1393291.pdf
    Data publikacji:
    2017
    Wydawca:
    Index Copernicus International
    Tematy:
    PEG
    gastronomy
    clinical nutrition
    Opis:
    Enteral feeding in the home environment is connected with creating access to digestive tract, and thanks to that, this kind of treatment is possible. The gold standard in enteral nutrition is PEG, other types of access are: nasogastric tube, gastronomy and jejunostomy. In the article 851 patients who were treated nutritionally in the home environment, in the nutrition clinic, Nutrimed Górny Śląsk, were analyzed. It was described how, in practice, the schedule of nutrition access looks like in the nutrition clinic at a time of qualifying patients to the treatment (PEG 47,35%, gastronomy 18,91%, nasogastric tube 17,39%,jejunostomy 16,33%) and how it changes among patients treated in the nutrition clinic during specific period of time – to the treatment there were qualified patients with at least three-month period of therapy ( second evaluation: PEG 37,01%, gastrostomy 31,13%, nasogastric tube 16,98%, jejunostomy 15,86%). The structure of changes was described, also the routine and the place in what exchanging or changing nutrition access was analyzed. Conclusions: The biggest changes in quantity, among all groups of ill people concerned patients with PEG and gastronomy. In most cases the intervention connected with exchanging access to the digestive tract could be implemented at patient’s home.
    Źródło:
    Polish Journal of Surgery; 2017, 89, 5; 6-11
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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