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    Wyświetlanie 1-15 z 15
    Tytuł:
    Analysis of Aerodynamic Characteristics of the Rocket-Target for the „Stinger” System
    Autorzy:
    Fedaravičius, A.
    Kilikevičius, S.
    Survila, A.
    Patašienė, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/403737.pdf
    Data publikacji:
    2016
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    aerodynamics
    drag force
    drag coefficient
    rocket-target
    Opis:
    This paper presents an analysis of aerodynamic characteristics of the rocket target for the final training of shooting at aerial targets by the „Stinger” system service staff. The governing equations of fluid dynamics are presented and the computational model of airflow around the rocket is developed. ANSYS CFX computational fluid dynamics software is used to compute airflow velocities, pressure, the drag force and the drag coefficient. A practical implementation of the research is presented. Taking into account the simulation results, the rocket-target was designed and manufactured.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2016, 7, 1 (23); 7-16
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on Ahmed’s body drag coefficient
    Autorzy:
    Wysocki, Dominik
    Szymanek, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2133935.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    Ahmed body
    aerodynamics
    wind tunnel
    drag coefficient
    boundary layer
    Opis:
    The work presents an experimental designation of the aerodynamic drag coefficient for two configurations of the Ahmed body model, with slant angle of 25° and with the inactive synthetic jet generator. When analyzing the aerodynamic drag of vehicles, most authors focus on higher Reynolds numbers, describing lower values only by designated trend lines. Which is why the main contribution of this experimental work was to designate the Ahmed’s body drag coefficient for low Reynolds numbers and to verify the obtained results with other authors experiments especially with the trend lines for Reynolds number in the range 0,35x105 – 1,8x105. For data taken from the literature, it can be seen that the value of the drag coefficient for the Ahmed body model decreases when the Reynolds number increases. The results obtained during the experiment show the opposite tendency.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2022, 25(1); 87--105
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar współczynnika oporu i czynnika kształtu cząstek typu flok
    Measurement of drag coefficient and sphericity of floc particles
    Autorzy:
    Adamski, R.
    Pakowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2071258.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cząstka typu flok
    współczynnik kształtu
    floc particles
    drag coefficient
    Opis:
    W literaturze brak informacji nt. współczynnika oporu cząstek typu flok. W tej pracy zmierzono współczynnik oporu metodą stanu nieustalonego i metodą stanu ustalonego oraz porównano wyniki obu metod. Na podstawie współczynnika oporu zidentyfikowano sferyczność w oparciu o równanie Haidera, Levenspiela. Stwierdzono, że zastosowanie teorii przepuszczalności Brinkmana daje lepszy opis współczynnika oporu dla cząstek typu flok.
    Drag coefficient of floe type particles is poorly described in literature. In this work drag coefficient was measured by two methods - unsteady state and steady state and the results were compared. On basis of drag coefficient the particle sphericity was identified using the Haider and Levenspiel formula. It was found that a better description of drag coefficient for floe particles was obtained using Brinkman's theory of permeability.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2010, 3; 15-16
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D simulation of incompressible flow around a rotating turbulator: Effect of rotational and direction speed
    Autorzy:
    Zoubai, Elhadi
    Laidoudi, Houssem
    Tlanbout, Ismail
    Makinde, Oluwole Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/27312235.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    rotating
    turbulator
    straight tube
    drag coefficient
    power number
    laminar
    flow
    Opis:
    This paper presents new results for the dynamic behaviour of fluid around a rotating turbulator in a channel. The turbulator has a propeller form which is placed inside a flat channel. The research was carried out using 3D numerical simulation. The rationale of the experiment was as follows: we put a propeller-turbulator inside a flat channel, and then we insert a water flow inside the channel. The turbulator rotates at a constant and uniform speed. The main points studied here are the effect of the presence of turbulator and its rotational direction on the flow behaviour behind the turbulator. The results showed that the behaviour of flow behind the turbulator is mainly related to the direction of turbulator rotating. Also, the studied parameters affect coefficients of drag force and power number. For example, when the turbulator rotates in the positive direction, the drag coefficient decreases in terms of rotational speed of the turbulator, while the drag coefficient increases in terms of rotational speed when the turbulator rotates in the negative direction.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 2; 139--157
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza porównawcza współczynników oporu naddźwiękowych pocisków moździerzowych
    Comparison analysis of drag coefficients for supersonic mortar projectiles
    Autorzy:
    Magier, M.
    Merda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/235903.pdf
    Data publikacji:
    2016
    Wydawca:
    Wojskowy Instytut Techniczny Uzbrojenia
    Tematy:
    mechanika
    balistyka
    pocisk moździerzowy
    współczynnik oporu
    mechanics
    ballistics
    mortar projectile
    drag coefficient
    Opis:
    W artykule przedstawiono wyniki analizy porównawczej współczynników oporu uzyskanych na postawie wyników badań strzelaniem i symulacji numerycznych. Wyniki obliczeń numerycznych przeprowadzone metodą CFD z wykorzystaniem oprogramowania Ansys Fluent v16, posłużyły m.in. do opracowania wstępnych tabel strzelniczych dla nowoprojektowanych pocisków do moździerza RAK.
    Results of comparison between drag coefficients established by the firing tests and numerical simulations are presented in the paper. The results of numerical calculations carried out by CFD method, exploiting Ansys Fluent v16 software, were used to develop initial firing tables for newly designed projectiles for RAK mortar.
    Źródło:
    Problemy Techniki Uzbrojenia; 2016, 45, 140; 21-28
    1230-3801
    Pojawia się w:
    Problemy Techniki Uzbrojenia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the drag coefficient of a motorcycle helmet
    Autorzy:
    Czyż, Z.
    Karpiński, P.
    Sevdim, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/118113.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    numerical analysis
    CFD
    drag coefficient
    motorcycle helmets
    analiza numeryczna
    współczynnik oporu
    kaski motocyklowe
    Opis:
    The paper discusses a numerical investigation, using a CFD tool, ANSYS FLUENT, of drag acting on a motorcycle helmet. The simulations were performed on a model of a helmet downloaded from a free CAD model library. A solid model enabled us to generate a mesh, to define boundary conditions and to specify a model of turbulence. Accordingly, the values of forces acting on individual sections of the helmet were obtained and the coefficients of aerodynamic drag were calculated. The test results can be used to optimize the shape of the existing motorcycle helmet construction and to study the impact of generated drag forces on reaction forces affecting a motorcyclist’s body.
    Źródło:
    Applied Computer Science; 2018, 14, 1; 16-26
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and performance of the converging-diverging vortex flowmeter
    Autorzy:
    Sun, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/221011.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vortex flowmeter
    converging-diverging structure
    lower limit of measurement
    Strouhal number
    drag coefficient
    Opis:
    The converging-diverging structure is introduced to extend the lower limit of measurement of vortex flowmeters. As a compact device, the converging-diverging vortex flowmeter is proposed and designed, and its performance is studied experimentally. It is found that, first of all, an up to 51% extension of the lower measurement limit can be realized through the converging-diverging structure, compared with conventional vortex flowmeters; second, the converging-diverging vortex flowmeter with a trapezoidal bluff body has a larger Strouhal number and smaller pressure loss. The results suggest that the converging-diverging vortex flowmeter provides an alternative device especially suitable for the measurement of low-velocity fluids.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 1; 129-136
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An experimental and numerical study of supercavitating flows around axisymmetric cavitators
    Autorzy:
    Javadpour, S. M.
    Farahat, S.
    Ajam, H.
    Salari, M.
    Nezhad, A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/949307.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    natural cavitation
    mass transfer
    water tunnel
    finite element method
    drag coefficient
    axisymmetric cavitators
    Opis:
    It has been shown that developing a supercavitating flow around under-water projectiles has a significant effect on their drag reduction. As such, it has been a subject of growing attention in the recent decades. In this paper, a numerical and experimental study of supercavitating flows around axisymmetric cavitators is presented. The experiments are conducted in a semi-open loop water tunnel. According to the Reynolds-Averaged Navier-Stokes equations and mass transfer model, a three-component cavitation model is proposed to simulate the cavitating flow. The corresponding governing equations are solved using the finite element method and the mixture Rayleigh-Plesset model. The main objective of this research is to study the effects of some important parameters of these flows such as the cavitation number, Reynolds number and conic angle of the cavitators on the drag coefficient as well as the dimensions of cavities developed around the submerged bodies. A comparison of the numerical and experimental results shows that the numerical method is able to predict accurately the shape parameters of the natural cavitation phenomena such as cavity length, cavity diameter and cavity shape. The results also indicate that the cavitation number declines from 0.32 to 0.25 leading to a 28 percent decrease in the drag coefficient for a 30° cone cavitator. By increasing the Reynolds number, the cavity length is extended up to 322% for a 60° cone cavitator.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 795-810
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis and optimization of a winglet sweep angle and winglet tip chord for improvement of aircraft flight performance
    Autorzy:
    Al-Khafaji, Ali J. Dawood
    Panatov, Gennady S.
    Boldyrev, Anton S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096195.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    lift
    drag
    lift coefficient
    drag coefficient
    aircraft wing
    winglet
    angle of attack
    sweep angle
    SOLIDWORKS
    CFD
    ANSYS FLUENT
    współczynnik siły nośnej
    współczynnik oporu
    skrzydło samolotu
    skrzydełko aerodynamiczne
    kąt natarcia
    SolidWorks
    ANSYS Fluent
    Opis:
    In this paper, a study of the effect of winglet sweep angle and winglet tip chord of the aircraft wing on the aerodynamics performances and how to improve it are carried out, assuming Cant angle 60°, winglet height = 3.5 m, Toe angle = -5°, and Twist angle = +5°. Different sweep angles tested (-25°, -15°, 0°, +15°, +25°, +35°, and +45°) and winglet tip chord (0.25, 0.375, and 0.5 m). Four Angle of attack is presented (0°, 3°, 6°, and 9°). The aerodynamics properties of the wing were measured in terms of calculated lift to drag ratio to decide which wing has a high value of lift and lower drag. All models of a wing (eighty-four models) are drawn for 3D using the SOLIDWORKS program. Boeing 737-800 wing dimensions were used. All models of a wing were analyzed using ANSYS FLUENT. The results showed that sweep angle and winglet tip chord of the winglet by changing their configuration can improve aerodynamic performance for various attack angles. The maximum value of the lift to drag ratio was obtained with a sweep angle -15°, winglet tip chord 0.375m, and angle of attack 3°.
    Źródło:
    Diagnostyka; 2022, 23, 2; art. no. 2022210
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ruch pęcherzyka w cieczach i fizykochemiczna metoda detekcji zanieczyszczeń powierzchniowo-aktywnych w wodzie
    Bubble motion in liquids and physocochemcal method of detection of surface-active pollutants in water
    Autorzy:
    Zawała, Jan
    Kosior, Dominik
    Małysa, kazimierz
    Powiązania:
    https://bibliotekanauki.pl/articles/1853755.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    surfaktanty
    micelizacja
    krytyczne stężenie micelarne
    ultrafiltracja micelarna
    bubble
    velocity
    surfactant
    drag coefficient
    dynamic adsorption layer
    Opis:
    Motion of gas bubbles in aqueous phase (either clean water or solutions of surface-active substances) is a phenomenon of great practical importance. Gas/liquid contacting is one of the most common operations in the chemical and petrochemical industry and mineral processing In particular in mineral industry, for all kind of flotation processes it is the main act responsible for the success of the entire technology As a result, properties of the liquid/gas interfaces are considered as a one of the most important parameters, determining the outcome of industrial applications and engineering processes. These properties can be modified by surfactants which adsorption (molecules accumulation) at the interfaces leads to the decrease in the interfacial tension and modification of the hydrodynamic boundary conditions. Description of a single bubble motion in wide range of flow magnitude (Reynolds numbers) is not trivial and many attempts have been undertaken to quantify a bubble behavior in liquids. This paper presents a short overview of the current “state of arts” on physics of the bubble motion in liquids and the elaborated models, describing motion of the bubble formed in liquid phase. The comparison of the theoretical models predictions with the available experimental data is presented. It is shown, moreover, that the bubble velocity can be used as a very sensitive tool for detection of organic contaminations in environmental water samples.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 9-10; 1317-1342
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental Monitoring and Simulation of Infrasound Generating Mechanism of Traffic Flow
    Autorzy:
    Grafkina, Marina Vladimirovna
    Nyunin, Boris Nikolaevich
    Sviridova, Evgeniya Yurevna
    Powiązania:
    https://bibliotekanauki.pl/articles/124397.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    infrasound
    ground vehicles
    environmental monitoring
    infrasound pressure
    shedding
    vortices
    drag coefficient
    wheel harmonics
    driving speed
    Opis:
    Ground vehicles are the main sources of noise and infrasounds in residential areas. Numerous published works are devoted to the studies of audible sound, its sources in vehicle, and development of measures to its reduction. The authors believe that the problem of infrasound occurrence and propagation in residential areas and – hence – its negative impact on humans and ambient environment is underestimated. Development of predictions and experimental methods of studying the infrasound generating mechanism and environmental monitoring of this negative factor are an urgent issue. A significant portion of acoustic emission from a vehicle comprises infrasound and low frequency range. Internal and external infrasound of vehicle were measured. A prediction model was proposed and the influence of vehicle design features on the infrasound level was estimated. Predictions of the external infrasound generating the mechanism of vehicles reveal that its frequency and level depend on driving speed, drag coefficient, vehicle body length, and Strouhal number Wheels, which execute rotation and progressive movement in airstream, are important sources of vehicle infrasound. Five wheel harmonics were calculated for motor vehicles at various driving speeds, the existing dependences are detected. It was demonstrated that the regulatory levels of infrasound can be exceeded only in residential areas adjacent to traffic flow with driving speeds higher than 80 km/h. The results of field studies of infrasound level on the streets of Moscow were presented. Recommendations on the development of environmental monitoring and main approaches to reduce infrasound in urban environment were given.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 7; 90-97
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    35 mm ammunition’s trajectory model identification based on firing tables
    Autorzy:
    Baranowski, L.
    Gadomski, B.
    Majewski, P.
    Szymonik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200598.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identification
    exterior ballistics
    equations of projectile motion
    curve fitting
    drag coefficient
    identyfikacja
    ruch pocisku
    współczynnik oporu
    Opis:
    The article presents a procedure designed for identification of projectile’s trajectory model through aerodynamic coefficients estimation. The identification process is based on firing tables artificially prepared (firing tables prepared using mathematical flight model for the projectile instead of trajectories recorded on field tests) with the use of modified point–mass and rigid body trajectory models. All the necessary data, including physical parameters of the projectile and its aerodynamic characteristics are provided. The detailed results of estimation of chosen aerodynamic coefficients are presented in both visual and tabular form. The main purpose of this paper is to establish the minimum number of trajectories (as characterized in firing tables), and the permissible error of initial parameters being passed to the mathematical model that would allow the correct identification of projectile’s trajectory model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 635-643
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of computational domain discretization on CFD results concerning aerodynamics of a vehicle
    Autorzy:
    Sosnowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/122297.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    computational domain discretization
    fluid dynamics
    aerodynamics
    AHMED body
    drag coefficient
    dyskretyzacja domeny obliczeniowej
    dynamika płynów
    aerodynamika
    współczynnik oporu
    Opis:
    The paper presents research concerning the influence of computational domain discretization on the results of CFD analysis. Tetrahedral and polyhedral numerical mesh types are analyzed and the mesh convergence index is calculated. The obtained results are compared to the experimental measurements concerning the estimation of drag coefficient of the vehicle model. The research carried out indicates the great influence of pre-processing on the reliability of the obtained results. Moreover, the advantages of polyhedral mesh over tetrahedral mesh are pointed out in the paper.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 1; 79-88
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of drag coefficient formula choice on wind stress climatology in the North Atlantic and the European Arctic
    Autorzy:
    Wrobel-Niedzwiecka, I.
    Drozdowska, V.
    Piskozub, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48480.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    drag coefficient
    parametrization
    boundary condition system
    wind stress
    climatology
    physical process
    biogeochemical process
    European Arctic
    North Atlantic
    wind field
    Źródło:
    Oceanologia; 2019, 61, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical computation of low Reynolds number viscous flow past bluff bodies
    Autorzy:
    Tarafder, Md. Shahjada
    Mursaline, Miad Al
    Powiązania:
    https://bibliotekanauki.pl/articles/1839825.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ
    płyn lepki
    liczba Reynoldsa
    współczynnik oporu
    viscous flow
    low Reynolds number
    SIMPLE algorithm
    circular cylinder
    square cylinder
    drag coefficient
    Opis:
    This article presents a two-dimensional steady viscous flow simulation past circular and square cylinders at low Reynolds numbers (based on the diameter) by the finite volume method with a non-orthogonal body-fitted grid. Diffusive fluxes are discretized using central differencing scheme, and for convective fluxes upwind and central differencing schemes are blended using a ‘deferred correction’ approach. A simplified pressure correction equation is derived, and proper under-relaxation factors are used so that computational cost is reduced without adversely affecting the convergence rate. The governing equations are expressed in Cartesian velocity components and solution is carried out using the SIMPLE algorithm for collocated arrangement of variables. The mesh yielding grid-independent solution is then utilized to study, for the very first time, the effect of the Reynolds number on the separation bubble length, separation angle, and drag coefficients for both circular and square cylinders. Finally, functional relationships between the computed quantities and Reynolds number (Re) are proposed up to Re = 40. It is found that circular cylinder separation commences between Re= 6.5-6.6, and the bubble length, separation angle, total drag vary as Re, Re-0.5, Re-0.5 respectively. Extrapolated results obtained from the empirical relations for the circular cylinder show an excellent agreement with established data from the literature. For a square cylinder, the bubble length and total drag are found to vary as Re and Re-0.666, and are greater than these for a circular cylinder at a given Reynolds number. The numerical results substantiate that a square shaped cylinder is more bluff than a circular one.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 133-157
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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