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Wyświetlanie 1-15 z 42
Tytuł:
Effect of impeller shape on solid particle suspension
Autorzy:
Rieger, F.
Jirout, T.
Ceres, D.
Seichter, P.
Powiązania:
https://bibliotekanauki.pl/articles/185746.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixing
axial impeller
hydrofoil impeller
just-suspended impeller speed
electrochemical metod
mieszanie
wirnik osiowy
prędkość wirnika
metoda elektrochemiczna
Opis:
This paper deals with the effect of impeller shape on off-bottom particle suspension. On the basis of numerous suspension measurements, correlations are proposed for calculating the just-suspended impeller speed for a standard pitched four-blade turbine and three types of hydrofoil impellers produced by TECHMIX for several particle sizes and for a wide range of particle concentrations. The suspension efficiency of the tested impellers is compared with the efficiency of a standard pitched blade turbine on the basis of the power consumption required for off-bottom suspension of solid particles. It is shown that the standard pitched blade turbine needs highest power consumption, i.e. it exhibits less efficiency for particle suspension than hydrofoil impellers produced by TECHMIX.
Źródło:
Chemical and Process Engineering; 2013, 34, 1; 139-152
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for analysing ram pressure characteristics of impeller pump rotor
Autorzy:
Puzyrewski, R.
Żochowski, K.
Flaszyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/259353.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
impeller pumps
characteristics
tests
Opis:
This paper presents a method in which typical tests of centrifugal pump are used to obtain information on real value of discharge angle of flow leaving the rotor. The method can be applied to properly choose inlet angle to blade palisade of centrifugal guide vanes in the case when to perform measurements of velocity fields behind the rotor more precisely is not possible.
Źródło:
Polish Maritime Research; 2009, S 1; 52-57
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on blending characteristics of axial flow impellers
Autorzy:
Fort, I.
Jirout, T.
Powiązania:
https://bibliotekanauki.pl/articles/185615.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wirnik osiowy
wirnik tarczowy
przepływ burzliwy
axial flow impeller
pitched-blade impeller
turbulent flow
impeller power input
blending time
Opis:
This paper presents an analysis of the blending characteristics of axial flow high-speed impellers under a turbulent regime of flow of an agitated low viscosity liquid. The conductivity method is used to determine the time course of blending (homogenisation) of miscible liquids in a pilot plant fully baffled mixing vessel, and a torquemeter is used for measuring the impeller power input in the same system. Four-blade and six-blade pitched blade impellers and three high efficiency axial flow impellers are tested for the given degree of homogeneity (98%). The experimental results and also the results of the authors' previous study, in accordance with the theoretical approach described in the literature, show that there is a universal relationship between the impeller power number and the dimensionless blending time, taking into consideration the impeller-to-vessel diameter ratio, independent of the geometry of the axial flow impeller but dependent on the degree of homogeneity. This relationship is found to be valid on a pilot plant scale under a turbulent flow regime of an agitated liquid.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 311-319
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on key process technology for profile electrolytic finishing of large marine propeller impeller
Autorzy:
Ding, B.
Chen, Y.
Zhou, J.
Chen, P.
Powiązania:
https://bibliotekanauki.pl/articles/259906.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
integral impeller
electrolysis processing
blade
Opis:
An electrolysis process method for free-form blade surface finishing is proposed for a free-form surface impeller, and a stepwise method is used to process the inter-blade channel of the overall impeller. The forming cathode is then used to finish the blade to meet the blade processing requirements. In the design, the forming cathode structure was improved by using motion simulation software, and the flow field simulation software was used to simulate and analyze the cathode flow channel. The cathode shape and the electrolyte flow rate between the electrodes meet the processing requirements. In the process of processing experiments, the motion path of the cathode was analyzed and optimized. The effect of the feed direction on the uneven distribution of the blade machining gap was reduced through optimization, and highfrequency pulse power processing was used to reduce the machining gap and improve the machining accuracy of the blade. The experimental results show that the process scheme is feasible and the precision of the processed impeller free-form surface is significantly improved. The material is a monolithic turbine disk of high-temperature alloys, and its large twisted blade processing has always been a problem in the manufacturing industry.
Źródło:
Polish Maritime Research; 2018, S 2; 158-163
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pumping capacity of pitched blade multi – stage impellers
Autorzy:
Jirout, T.
Powiązania:
https://bibliotekanauki.pl/articles/185756.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pitched blade impeller
multi-stage impeller
impeller pumping capacity
velocity
profile
laser Doppler anemometry
wirnik wielostopniowy
wydajność pompowania wirnika
prędkość
profil
laser Dopplera
Opis:
This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between Impellers H3/d= 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d= 1.25, the multi-stage impeller creates two separated circulation loops.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 47-53
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling of Metal Melt Refining Process in Ladle with Rotating Impeller and Breakwaters
Autorzy:
Sviželová, J.
Tkadlečková, M.
Michalek, K.
Walek, J.
Saternus, M.
Pieprzyca, J.
Merder, T.
Powiązania:
https://bibliotekanauki.pl/articles/353863.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium
refining
numerical modelling
rotating impeller
degassing
Opis:
The paper describes research and development of aluminium melt refining technology in a ladle with rotating impeller and breakwaters using numerical modelling of a finite volume/element method. The theoretical aspects of refining technology are outlined. The design of the numerical model is described and discussed. The differences between real process conditions and numerical model limitations are mentioned. Based on the hypothesis and the results of numerical modelling, the most appropriate setting of the numerical model is recommended. Also, the possibilities of monitoring of degassing are explained. The results of numerical modelling allow to improve the refining technology of metal melts and to control the final quality under different boundary conditions, such as rotating speed, shape and position of rotating impeller, breakwaters and intensity of inert gas blowing through the impeller.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 659-664
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Diagnostic of Cavitation Flow in the Centrifugal Pump Under Various Impeller Speeds Based on Acoustic Analysis Method
Autorzy:
Al-Obaidi, Ahmed Ramadhan
Powiązania:
https://bibliotekanauki.pl/articles/31339870.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
experimental analysis
impeller speed
cavitation
acoustic signals
Opis:
Condition monitoring in a centrifugal pump is a significant field of study in industry. The acoustic method offers a robust approach to detect cavitations in different pumps. As a result, an acoustic-based technique is used in this experiment to predict cavitation. By using an acoustic technique, detailed information on outcomes can be obtained for cavitation detection under a variety of conditions. In addition, various features are used in this work to analyze signals in the time domain using the acoustic technique. A signal in the frequency domain is also investigated using the fast Fourier method. This method has shown to be an effective tool for predicting future events. In addition, this experimental investigation attempts to establish a good correlation between noise characteristics and cavitation detection in a pump by using an acoustic approach. Likewise, it aims to find a good method for estimating cavitation levels in a pump based on comparing and evaluating different systems.
Źródło:
Archives of Acoustics; 2023, 48, 3; 159-170
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of using vacuum casting process for manufacturing cast models of turbocharger impellers
Autorzy:
Budzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/243370.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turbocharger impeller
rapid prototyping systems
vacuum casting
Opis:
Possibilities of producing cast models of turbocompressor impellers in silicon matrices by vacuum casting process are presented. Vacuum casting process enables producing cast models of impellers for precision casting. A standard model for silicon matrix making is a prototype produced with stereo lithography technique. The advantage of stereo lithographic model is its easy machinability that enables higher quality of impeller model surface. Silicon matrices enable casting of prototype models from foundry plastics, such as: casting wax, polyurethanes, polyester and epoxy resins. Properties of the plastic material used determine the shape of die parting. Because of its low strength, casting wax enforces die parting into a larger number of elements, thus enabling to pull it out without damage. The prototypes made from casting resins require considerably fewer parting surfaces. Silicon matrices enable to manufacture from several to several dozen cast patterns of prototype turbocharger impellers. The basic advantage of vacuum casting process is the shortening of prototype making time and cost, compared to traditional methods. The silicon matrixes permit casting and low-pressure injections of plastics. Some plastics may be used for producing foundry patterns for various metal alloy casting processes.
Źródło:
Journal of KONES; 2007, 14, 3; 125-130
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blending characteristics of high-speed rotary impellers
Autorzy:
Fořt, I.
Seichter, P.
Pešl, L.
Rieger, F.
Jirout, T.
Powiązania:
https://bibliotekanauki.pl/articles/185151.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-speed rotary impeller
turbulent flow
impeller power input
blending time
impeller blending efficiency
wirnik obrotowy dużych prędkości
przepływ turbulentny
pobór mocy wirnika
czas mieszania
efektywność mieszania wirnikiem
Opis:
This paper presents a comparison of the blending efficiency of eight high-speed rotary impellers in a fully baffled cylindrical vessel under the turbulent flow regime of agitated charge. Results of carried out experiments (blending time and impeller power input) confirm that the down pumping axial flow impellers exhibit better blending efficiency than the high-speed rotary impellers with prevailing radial discharge flow. It follows from presented remsults that, especially for large scale industrial mrealisations, the axial flow impellers with profiled blades bring maximum energy savings in mcomparison with the standard impellers with inclined flat blades (pitched blade impellers).
Źródło:
Chemical and Process Engineering; 2013, 34, 4; 427-434
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comments on Flow characteristics of axial high speed impellers
Autorzy:
Joshi, J.B.
Powiązania:
https://bibliotekanauki.pl/articles/185547.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
charakterystyka przepływowa
wirnik osiowy
flow characteristics
axial impeller
Opis:
Fort et al. (2010) have written another useful article on flow characteristics generated by axial high speed impellers. I agree with the authors that the knowledge of flow patterns is crucial for developing reliable design procedures for instance, for mixing and blending (Baldyga and Bourne, 1997; Nienow, 1997; Ranade et al., 1991), for solid suspension (Raghva Rao et al., 1988; Zwietering, 1958), for gas induction (Joshi and Sharma, 1977) and bioreactions where controlled shear is important (Joshi et al., 1996). With this context, the work of Fort et al. (2010) needs some clarification and further extension.
Źródło:
Chemical and Process Engineering; 2012, 33, 2; 311-315
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric design and analysis of industrial dye mixing machines
Autorzy:
Ayaz Ümütlü, Hatice Cansu
Kıral, Zeki
Powiązania:
https://bibliotekanauki.pl/articles/140103.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parametric design
computer-aided design
impeller modeling
simulation
Opis:
Structural design analyses of industrial dye mixing machines, concerning mixing impeller geometries, mixing performances, and power requirements aren’t generally of scientific quality. Our aim is to propose a practical method for minimizing execution time, using parametric design. In this study, Visual Basic API codes are developed in order to model the impellers in SolidWork,sup>R software, and then flow analyses are conducted. Thus, velocity values and moment/torque values required for mixing operation are determined. This study is carried out for different shaft rotational speeds and different impeller diameters. Flow trajectories are obtained. After that, frequency analyses are conducted and natural frequency values are obtained. In the scope of this study, two different impeller types are investigated.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 2; 211-227
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Replay to Comments on Flow characteristics of axial high speed impellers
Autorzy:
Fort, I.
Powiązania:
https://bibliotekanauki.pl/articles/185464.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
charakterystyka przepływowa
wirnik osiowy
flow characteristics
axial impeller
Opis:
The comments made by Professor Joshi are a most welcome addition to the findings presented by us (Fort et al., 2010). We agree that many valuable studies in the past dealt with experimental investigation of turbulent velocity field in stirred systems with axial high-speed impellers. Therefore it would be highly desirable to present a comprehensive comparison of the efficiency of various types of impellers, especially for their optimum design for processes in chemical and biochemical industries. Nevertheless in such a comparison it should be taken to consideration the quality and reliability of experimental data, because both chosen experimental techniques and selected independent variables (position of impeller, viscosity and density of agitated liquid, etc.) have to be well defined and comparable in all investigated stirred systems.
Źródło:
Chemical and Process Engineering; 2012, 33, 2; 317-318
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface roughness of aircraft engine blade models produced with various methods of rapid prototyping
Autorzy:
Budzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/243159.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
rapid prototyping systems
surface roughness
impeller blade
Opis:
Results of the study of surface roughness of the aircraft engine blade model, produced with various methods of rapid prototyping are presented. Blade models were made with two incremental methods of rapid prototyping: stereo lithography (SLA-250 device) and three-dimensional printing (Z510 Spectrum printer). In incremental methods of rapid prototyping a model is formed by hardening of consecutive layers of the base material. Model position in the equipment work area has a significant influence on surfaces quality of a prototype, especially in stereo lithography method. It is essential in case of elements with curvilinear surfaces like aircraft engine blades. A CAD blade has been exported to the STL format within surface precision of 0,001 mm. Afterwards, it was duplicated and set up in various positions of the virtual work area of the 3D Light year programme dedicated to the SLA-250 device. Data prepared in this way have been used for producing physical models. Roughness surveys were carried out with the Talyscan150 device, manufactured by Taylor Hobson Precision. The measurements permitted making three-dimensional maps of surfaces of blade prototypes. Thanks to that, it was possible to determine optimum position of blade in the work area of RP devices in respect to prototype surface quality.
Źródło:
Journal of KONES; 2007, 14, 2; 55-60
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
Autorzy:
Skocilas, J.
Fort, I.
Jirout, T.
Powiązania:
https://bibliotekanauki.pl/articles/185244.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pitched blade impeller
erosion wear
ensemble-average mean velocity
impeller
pumping capacity
CFD simulation
prędkość uśredniona
wirnik
wydajność pompy
symulacji CFD
Opis:
This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
Źródło:
Chemical and Process Engineering; 2013, 34, 1; 39-49
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of fluid flow and power consumption in a stirred vessel with a Scaba 6SRGT impeller
Autorzy:
Ameur, H.
Bouzit, M.
Helmaoui, M.
Powiązania:
https://bibliotekanauki.pl/articles/185604.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wirnik Scaba
numeryczne badania 3D
przepływ nienewtonowski
3D numerical study
non-Newtonian fluid
stirred vessel
Scaba impeller
impeller eccentricity
Opis:
The present work deals with agitation of non-Newtonian fluids in a stirred vessel by Scaba impellers. A commercial CFD package (CFX 12.0) was used to solve the 3D hydrodynamics and to characterise at every point flow patterns especially in the region swept by the impeller. A shear thinning fluid with yield stress was modelled. The influence of agitator speed, impeller location and blade size on the fluid flow and power consumption was investigated. The results obtained are compared with available experimental data and a good agreement is observed. It was found that an increase in blade size is beneficial to enlargement of the well stirred region, but that results in an increased power consumption. A short distance between the impeller and the tank walls limits the flow around the agitator and yields higher power consumption. Thus, the precise middle of the tank is the most appropriate position for this kind of impeller.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 351-366
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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