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    Wyświetlanie 1-14 z 14
    Tytuł:
    Turbomachinery component design by means of CFD
    Autorzy:
    Braembussche, R. A. van den
    Powiązania:
    https://bibliotekanauki.pl/articles/1986748.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbomachinery
    blade design
    optimization
    inverse design
    Opis:
    A short overview of the main techniques for turbomachinery blade design based on CFD is followed by a more detailed description on an Optimisation- and Inverse Design method, developed at the von Karman Institute. The optimisation method uses an Artificial Neural Network to extract knowledge from a Database containing the results of previous designs and a Genetic Algorithm to define the optimum blade. The inverse design method makes use of the Euler or Navier-Stokes equations to predict how a given 3D blade shape should be modified to reach a prescribed pressure or Mach number distribution along the blade surface. Examples of transonic compressor and turbine blades, designed by both methods, illustrate the potential of these modern aero-design systems. Special attention is given to the problems related to existence and uniqueness and to those features that facilitate the practical use of these methods.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 39-61
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A blade design performance based off-design loss prediction method for axial flow compressors and cascades
    Autorzy:
    Wu, Dongrun
    Teng, Jinfang
    Qiang, Xiaoqing
    Yang, Zhong
    Powiązania:
    https://bibliotekanauki.pl/articles/281416.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    blade design performance
    off-design loss
    prediction method
    axial flow compressor
    cascade
    Opis:
    A series of compressor and cascade test recordings are studied to investigate the off-design loss prediction method. The blade design performance is used to predict the off-design loss changing rate at all operating conditions through analytical derivations and statistical correlation studies. The linear correlation between the incidence and a non-dimensional blade loading factor is the foundation of the prediction method. The off-design incidence is normalized using the off-design blade loading factor for different series of blade designs. An analytical method is introduced to predict the off-design blade loading factor based on design parameters and linear correlation. The changing rate of the off-design loss against the blade loading factor is empirically given through statistical analysis. In application, the prediction method can be used to demonstrate the design space of the off-design incidence for a blade series. The modification of the endwall and the rotor tip loss is recommended to give a more accurate prediction in those regions.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 973-985
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine
    Autorzy:
    Głuch, Stanisław Jerzy
    Ziółkowski, Paweł
    Witanowski, Łukasz
    Badur, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1955024.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial turbine
    blade design
    computational fluid dynamics
    last stage of low-pressure
    twisted blade
    Opis:
    Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency and strength of turbine blades. This paper relates to a new type turbine which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in a wet combustion chamber. The main aim of this paper is to design and analyze the flow characteristics of the last stage of gas-steam turbine. When creating the spatial model, the atlas of profiles of reaction turbine steps was used. Results of computational fluid dynamics simulations of twisting of the last stage are presented. Blades geometry and the computational mesh are also presented. Velocity vectors, for selected dividing sections that the velocity along the pitch diameter varies greatly. The blade has the shape of its cross-section similar to action type blades near the root and to reaction type blades near the tip. Velocity fields and pressure fields show the flow characteristics of the last stage of gas-steam turbine. The net efficiency of the cycle is equal to 52.61%.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 255-278
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Engineering design of low-head Kaplan hydraulic turbine blades using the inverse problem method
    Autorzy:
    Krzemianowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/200629.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inverse method
    hydraulic turbine blade design
    low-head Kaplan turbine
    curvilinear coordinate system
    Christoffel symbols
    Opis:
    The paper concerns the engineering design of guide vane and runner blades of hydraulic turbines using the inverse problem on the basis of the definition of a velocity hodograph, which is based on Wu’s theory [1, 2]. The design concerns the low-head double-regulated axial Kaplan turbine model characterized by a very high specific speed. The three-dimensional surfaces of turbine blades are based on meridional geometry that is determined in advance and, additionally, the distribution of streamlines must also be defined. The principles of the method applied for the hydraulic turbine and related to its conservation equations are also presented. The conservation equations are written in a curvilinear coordinate system, which adjusts to streamlines by means of the Christoffel symbols. This leads to significant simplification of the computations and generates fast results of three-dimensional blade surfaces. Then, the solution can be found using the method of characteristics. To assess usefulness of the design and robustness of the method, numerical and experimental investigations in a wide range of operations were carried out. Afterwards, the so-called shell characteristics were determined by means of experiments, which allowed to evaluate the method for application to the low-head (1.5 m) Kaplan hydraulic turbine model with the kinematic specific speed (»260). The numerical and experimental results show the successful usage of the method and it can be concluded that it will be useful in designing other types of Kaplan and Francis turbine blades with different specific speeds.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1133-1147
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel 3D inverse method for the design of turbomachinery blades in rotational viscous flow: theory and applications
    Autorzy:
    Tiow, W. T.
    Zangeneh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1986747.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    inverse design
    blade loading
    turbomachinery
    blades
    Opis:
    The development and application of a three-dimensional (3D) inverse methodology is presented for the design of turbomachinery blades. The design method is based on the specification of the blade loading distribution and the corresponding blade shape is systematically sought using directly the difference between the target and initial values. The design procedure comprises mainly of a CFD solver code and the blade-update algorithm to calculate the desired blade geometry as well as the corresponding 3D flow. The CFD code is a well-validated three-dimensional flow solver and has shock capturing ability to cope in both subsonic and high transonic-shocked, viscous flow. Fundamentally, it is a cell-vertex, finite volume, time-marching solver employing the multistage Runge-Kutta integrator in conjunction with accelerating techniques (local time stepping and grid sequencing). To account for viscosity, viscous forces are included in the solution using the log-law and mixing length models. The effects of rotating blades as well as tip clearance flow are also included in the flow prediction. The capabilities of the present method are demonstrated in the redesign of a transonic fan blade, the NASA Rotor 67. The redesign focuses on the shocked flow near the tip, where the effects of shock-boundary interaction and leakage flow are examined. The result shows conclusively that the shock-formation and its intensity in such a high-speed turbomachinery flow are well defined on the loading distributions. Simple guidelines to change the loading distribution can be followed using the proposed inverse methodology to improve the blade shape.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 63-78
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultralight and Very Light Helicopter Rotor Data
    Autorzy:
    Dudnik, Vitaly
    Karabut, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/36818712.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    ultralight helicopter
    main rotor
    blade
    preliminary design
    Opis:
    In recent years, a significant number of one- and two-seat lightweight helicopters have come into existence, and this makes it possible to analyse parameters and determine dependencies for this class of helicopters. The knowledge of such dependencies is necessary at the preliminary design stage. The analysis performed in this paper and its comparison with the statistical data of all categories of helicopters made it possible to determine the necessary corrections in the methods of determining the parameters of the helicopter’s rotor systems.
    Źródło:
    Transactions on Aerospace Research; 2023, 2 (271); 17-24
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of a Carbon Fiber Prosthetic Running Blade for Enhanced Reliability
    Autorzy:
    Siddiqui, Md Irfanul Haque
    Alnaser, Ibrahim Abdullah
    Alluhydan, Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/28328270.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    mechanical properties
    durability
    prosthetic design
    running blade prosthesis
    materials for running blade
    reliable
    Opis:
    This study focuses on the development of a reliable prosthetic running blade primarily composed of carbon fiber. The reliable performance of novel prosthetic running blades has been evaluated by mechanical testing and finite element numerical modeling. Theexperimental analysis confirmed that these blades exhibit superior suitability for high-impact activities, demonstrating reliable load-bearing capacity and effective shock absorption properties. The tensile testing exhibited a linear elastic behavior of the composite material up to a strain of 0.075 mm/mm. Further, it was found that stress concentration areas and fracture points within the blade structure. Furthermore, numerical results revealed a maximum deflection of 29.60 mm that the blade can achieve. The kinetic energy loss during impact demonstrated an 8.5% decrease in blade kinetic energy, with the highest loss occurring at Vy = 30 m/s. Ultimately, this research aims to enhance the reliability, durability, and safety of prosthetic running blades, empowering athletes to reach new heights in sports.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172668
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blade section profile array lifting surface design method for marine screw propeller blade
    Autorzy:
    Król, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/259996.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine propeller
    lifting surface
    blade section profile
    design
    Opis:
    The lifting surface model is widely used in screw propeller design and analysis applications. It serves as a reliable tool for determination of the propeller blade mean line and pitch distribution. The main idea of this application was to determine the blade shape that would satisfy the kinematic boundary condition on its surface with the prescribed bound circulation distribution over it. In this paper a simplified lifting surface method is presented – in which the 3D task for the entire blade is replaced by a set of 2D tasks for subsequent blade section profiles.
    Źródło:
    Polish Maritime Research; 2019, 4; 134-141
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Geometric Properties of a Jet Engine Fan Blades Based on Modal Vibration Testing
    Autorzy:
    Osiewicz, Maciej
    Cieślak, Sławomir
    Bielecki, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/36778970.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    blade vibration
    modal analysis
    finite elements
    design
    aviation
    Opis:
    The article presents an experimental method of determining the geometric properties of jet engine rotor airfoils based on modal vibration testing. The procedure is based on adjusting the results of analytical calculations to the laboratory outcomes. Experimental tests were carried out on a set of 20 jet engine fan blades made of AL7022-T6 aluminium alloy. Each blade differed in weight and geometric dimensions within the accepted design tolerance. Numerical analysis of five airfoils that differed in thickness was performed. Modal vibration test results were summarised and compared with the results obtained by the numerical method. The comparison revealed a high similarity of the frequency and form of vibrations acquired by numerical simulation for each of the blades in relation to the executed vibration testing. Based on the verification of the theoretical model with the results obtained through experimental testing, conclusions were drawn about the object’s dynamic behaviour and its technological quality and geometric properties, whereby each of airfoil was probably thinned.
    Źródło:
    Transactions on Aerospace Research; 2022, 3 (268); 56-74
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational investigation of vibration characteristics analysis for industrial rotor
    Autorzy:
    Aimeur, Noureddine
    Menasri, Noureddine
    Powiązania:
    https://bibliotekanauki.pl/articles/2204679.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    rotor dynamic
    finite element method
    reverse design
    CMM
    unbalanced
    blade wear
    simulation
    ANSYS
    Opis:
    During the operation of a rotor, various types of vibrations appear in this mechanical system and often limit the performance and endanger the safety of the operation. Therefore, dynamic analysis is essential because precise knowledge of the vibration behaviour is essential to ensure proper operation. This article presents a set of scientific techniques for the modelling and simulation of rotor vibrations. To work out the equations of the vibratory movement of the rotor, we used the energy approach of Lagrange. To achieve this, a model with one blading wheel carried by a shaft supported by two hydrodynamic bearings is chosen basedon the characteristics of the rotor studied (Fan 280 cement draft fan). It is an arduous task to manually ascertain the analytical resolution of the differential equations that characterise the vibratory behaviour of the rotor. The numerical approach employing the finite element method, programmed on the ANSYS software, made it possible to perform the vibration analysis of the rotor. First, the FAN 280 cement draft fan rotor is modelled using SolidWorks 3D software and reverse design using the coordinate measuring machine (CMM) for the design of the fins. Then, the modal characteristics of the fan rotor model were analysed using the finite element analysis (FEA) software ANSYS Workbench. Also, to study the effect of blade wear on critical speeds, the Campbell diagram was obtained. Finally, harmonic analysis was performed to determine the amplitude of the rotor vortex at critical speeds obtained with and without blade wear.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 373--381
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aerodynamic design of modern gyroplane main rotors
    Projektowanie aerodynamiczne nowoczesnych wirników autorotacyjnych
    Autorzy:
    Stalewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/213612.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    gyroplane
    main rotor
    rotor blade
    airfoil
    aerodynamic design and optimization
    Virtual Blade Model
    wiatrakowiec
    wirnik nośny
    łopata wirnika
    profil lotniczy
    aerodynamiczne projektowanie i optymalizcja
    Opis:
    Process of aerodynamic design and optimisation of main rotors intended for modern gyroplanes has been presented. First stage of the process was focused on development of family of airfoils, designed and optimised especially towards gyroplane applications. In next stage, based on developed family of airfoils, two alternative gyroplane main rotors were designed. The main optimisation criterion was to minimise aerodynamic drag of the rotor, for assumed flight velocity and lift force generated by the rotor, balancing the weight of the gyroplane. The paper discusses the applied methodology of design and optimisation as well as presents geometric and aerodynamics properties of designed main rotors.
    Przedstawiono proces aerodynamicznego projektowania i optymalizacji nowoczesnych wirników autorotacyjnych. Pierwszy etap prac dotyczył opracowanie rodziny profili lotniczych zaprojektowanych i zoptymalizowanych specjalnie pod kontem zastosowania ich na łopatach wirnika nośnego wiatrakowca. W kolejnym etapie, w oparciu o opracowaną rodzinę profili, zaprojektowano i zoptymalizowano dwa alternatywne wirniki nośne. Głównym kryterium optymalizacji było zminimalizowanie oporu aerodynamicznego wirnika, dla zakładanej prędkości lotu i siły nośnej generowanej przez wirnik, równoważącej ciężar wiatrakowca. Omówiono zastosowaną metodykę projektowania i optymalizacji konstrukcji lotniczych, jak również przedstawiono geometryczne i aerodynamiczne własności zaprojektowanych wirników nośnych.
    Źródło:
    Prace Instytutu Lotnictwa; 2016, 1 (242); 80-93
    0509-6669
    2300-5408
    Pojawia się w:
    Prace Instytutu Lotnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania użyteczności rozdrabniacza wielokrawędziowego i żyletkowego
    Investigation of usefulness of a multiedge and razor-blade disintegrator
    Autorzy:
    Macko, M.
    Tyszczuk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2072707.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rozdrabnianie
    konstrukcja rozdrabniacza wielokrawędziowego
    konstrukcja rozdrabniacza żyletkowego
    comminution
    design of multi-edge and razor-blade comminution system
    Opis:
    W pracy zaprezentowano koncepcję stanowiska badawczego rozdrabniania wielokrawędziowego i żyletkowego. Systemy rozdrabniania oparte o własne patenty realizują funkcję rozdrabniania z wysoką skutecznością. W układzie pomiarowym wykorzystano momentomierze i rejestratory prędkości obrotowej, dzięki czemu możliwe jest oszacowanie zapotrzebowania energetycznego na proces. Zaprezentowano wybrane wyniki badań próbek polimerowych.
    A concept of experimental setup for testing the multi-edge and razor-blade comminution is presented in the paper. Comminution systems based on our own patents perform the comminution with high effectiveness. Torque measure systems and the record of rotatory speed were used in the measuring arrangement. Thanks to that, it is possible to estimate the process energetic requirements. Selected results of comminution process of polymer samples are shown.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2013, 2; 47-48
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Manufacturing Tolerances on Stress in a Turbine Blade Fir-Tree Root
    Autorzy:
    Moneta, Grzegorz
    Jachimowicz, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2105140.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    fir-tree root
    turbine
    lock
    blade
    disk
    manufacturing tolerances
    Monte-Carlo simulations
    Six Sigma
    Low Cycle Fatigue
    Design of Experiment
    Opis:
    Low Cycle Fatigue (LCF) is one of most common mechanisms behind turbine blade failures. The reason is high stress concentration in notch areas, like fir-tree root groves, which can cause cyclic stress beyond the safe threshold. The stress levels strictly depend on the manufacturing accuracy of the fir-tree lock (for both fitted together: blade root and disk groove). The probabilistic study aimed at determination of stress was performed using Finite Element Method (FEM) simulation on a population of 1000 turbine models (disk + blades +friction dampers), where fir-tree lock dimensions were sampled according to the normal distribution, within limits specified in the documentation. The studies were performed for different manufacturing quality levels: 3-Sigma, 6-Sigma and 3-Sigma with tolerance ranges reduced twice. Based on the results, the probabilistic distributions, probabilities and expected ranges of values could be determined for: material plastification, stress, strain, LCF lifetime, etc. The study has shown how each tooth of the root is loaded and how wide a stress range should be expected in each groove. That gives information on how the definition of tolerances should be modified to make the construction more optimal, more robust, with lower likelihood of damage, taking into account the cost-quality balance. It also shows how the Six Sigma philosophy can improve the safety of the construction, its repeatability and predictability. Additionally, the presented numerical study is a few orders of magnitude more cost- and time-effective than experiment.
    Źródło:
    Fatigue of Aircraft Structures; 2020, 12; 92--101
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive GFRP rotor blades and additive manufacturing of the molding tools
    Autorzy:
    Ost, Lucas
    Seidlitz, Holger
    Kuke, Felix
    Yellur, Manoja Rao
    Krenz, Jonas
    Ulke-Winter, Lars
    Powiązania:
    https://bibliotekanauki.pl/articles/36847551.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Zarządzania Produkcją
    Tematy:
    additive manufacturing
    fiber-reinforced plastics
    lightweight design
    adaptive
    rotor blade
    tworzywo sztuczne wzmocnione włóknem
    lekka konstrukcja
    adaptacja
    łopata wirnika
    wytwarzanie przyrostowe
    Opis:
    Small wind turbines are mostly designed for strong and medium wind regions, which are scaled by manufacturers based on similarity rules. However, the inland region represents a low wind region where the commercially available blades are not profitable. In this work, a rotor blade was designed for these wind conditions and further performance improvement of the turbine was generated by self-adaptive adjustment of the blades to the variable wind loads. This adaptation is achieved by a ply structure that exhibits bending-torsion coupling. The tooling for the production of the GFRP rotor blades was manufactured using a large-format 3D extrusion printer.
    Źródło:
    Zarządzanie Przedsiębiorstwem; 2021, 24, 1-2; 15-18
    1643-4773
    Pojawia się w:
    Zarządzanie Przedsiębiorstwem
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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