Temat: flow field - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Analysis of abnormal vibrations of crude oil efflux pumps using Ansys
Autorzy:: Wang, Tianqi
Xie, Lei
Yu, Hongsheng
Wei, Xiuliang
Dong, Pengmin
Zhao, Tianyi
Tematy:: abnormal vibrations
internal flow field
Ansys; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2200858.pdf Link otwiera się w nowym oknie
Opis:: In this study, abnormal vibrations of 1 pump fluid in a crude oil efflux station in the Changqing Oilfield was investigated. Kinetic simulation was applied to flow fields in the crude oil efflux pump using Ansys to determine trends of the impeller static pressure, speed, total pressure, wall pressure of the impeller, outlet pressure and pressure on the pump shell and to identify the reasons behind the abnormal vibrations. The results indicated that the axial vibration amplitude of the pump could be reduced from 1.3mm down to 0.68mm if the operation parameters of the external control oil pump were set as 2500-2550r/min and 325-335m3/h, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The prediction of hull gesture and flow around ship based on Taylor expansion boundary element method
Autorzy:: Gong, Jiaye
Li, Yunbo
Tematy:: TEBEM
potential flow
flow field
hull gesture
surface pressure; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258520.pdf Link otwiera się w nowym oknie
Opis:: Based on the potential flow theory and traditional boundary element method (BEM), Taylor expansion boundary element method (TEBEM) is introduced in this paper for the prediction of the flow field around ship, as a result, hull gesture and pressure distribution on hull surface are obtained. By this method, dipole strength of every field point is expanded in Taylor expansion, so that approximately continuous hull and free surface boundary condition could be achieved. To close the new equation system, the boundary condition of tangent velocity in every control point is introduced. With the simultaneous solving of hull boundary condition and free surface condition, the disturbance velocity potential could be obtained. The present method is used to predict the flow field and hull gesture of Wigley parabolic hull, Series 60 and KVLCC2 models. To validate the numerical model for full form ship, the wave profile, the computed hull gesture and hull surface pressure of KVLCC2 model are compared with experimental results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical analysis of internal flow phenomena in a multi-blade centrifugal fan
Autorzy:: Wang, J.
Ou, Y.
Wu, K.
Tematy:: multi-blade centrifugal fan
internal flow field
CFD; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1964163.pdf Link otwiera się w nowym oknie
Opis:: A three-dimensional, steady, incompressible, turbulent flow field inside a multi-blade centrifugal fan used in an air-conditioner has been analyzed numerically. Reynolds-averaged Navier-Stokes equations with the standard k-epsilon turbulence model have been discretized by the finite volume method. The calculation results have shown complex three-dimensional characteristics of the flow, especially in the blade passages near the shroud side. The results have revealed a boundary layer separating the flow from the leading edge on the blade suction surface, the flow's reversal from the high pressure region inside the volute to the low pressure region near the impeller inlet, the flow's recirculation near the shroud side, a jet-wake pattern at the rotor exit, pressure fluctuation on the blade surface, etc. Some of the numerical results agree well with previous experiment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical modeling of heat transfer and flow field in a novel calcinator
Autorzy:: Zhou, Tie-zhuang
Yang, Bin
Wang, Cheng-qiang
Tematy:: novel calciner
heat transfer
flow field
numerical modelling; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/59124223.pdf Link otwiera się w nowym oknie
Opis:: This study focused on investigating the heat transfer and flow dynamics of a catalyst granule within a pilot calciner, employing both numerical modeling and computational fluid dynamics. The research comprised two primary components: (1) Simulation of the gas flow within the pilot calciner using the Eulerian–Eulerian approach, treating gases and catalyst particles as distinct phases – gas and granular. The model, encapsulating both heat transfer and flow processes, was developed in Fluent software version 16.0. Its accuracy was confirmed against empirical data from a pilot-scale calciner unit. (2) Subsequent to validation, the model was utilized to examine the distribution characteristics within the flow field, including the temperature profiles of gas and particles, the vector velocity field of the gas across different phases, and the overall heat transfer coefficient. This investigation aims to enhance the understanding of the complex heat transfer and flow dynamics in calciners, facilitating the optimization of operational parameters, performance, and structure of pilot-scale equipment. Furthermore, it provides foundational data pertinent to the future exploration of real-world industrial applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modelowanie numeryczne pola przepływu wokół budynków
Numerical investigations on the flow field near buildings
Autorzy:: Folusiak, M.
Tematy:: modelowanie numeryczne
pole przepływu
numerical investigations
flow field; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/213801.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono wyniki dwu- i trójwymiarowych symulacji numerycznych opływu budynków wykonanvch z wykorzystaniem pakietu obliczeniowego ANSYS Fluent. Rozpatrzono cztery przypadki obliczeniowe budynków o różnej szerokości.
In this paprer, results of two- and three-dimensional numerical investigations on the flow field near buildings, which were performed using ANSYS Fluent, are presented. For numerical cases of buildings of different width were investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical analysis of the tip vortex in an air-conditioners propeller fan
Autorzy:: Wang, J.
Wu, K.
Tematy:: tip vortex
internal flow field
propeller fan
numerical simulation; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1955218.pdf Link otwiera się w nowym oknie
Opis:: A steady, incompressible, turbulent flow field inside a propeller fan used in an air conditioner has been analyzed numerically using the single-equation Spalart-Allmaras turbulence model. It has been found that the formation of tip vortex starts from the blade tip's suction side at about one third of the axial chord's length aft of the rotor's leading edge. It is due to the rolling-up of the intense shear layer flow between the main axial flow and the suck-in inward flow caused by the large pressure difference between the pressure and the suction sides. The tip vortex passes through the blade passage in a curve reversed towards the direction of the blade's rotation. Its trace is partial to the tangential direction as it goes into the aft part of the blade passage covered by the shroud and, simultaneously, its trace in the radial direction is turned from the outward direction to the inward direction. The operating flow rates have an important effect on the axial position of the tip vor-tex's trace, while its effect on the radial position is negligible. At law flow rates, the vortex disappears at a location closer to the leading edge. The effect of the shroud's width on the tip vortex's trajectory is notable. For a fan with a wide shroud, the trace of the tip vortex moves upstream with a smaller radial influence region than that of a fan with a narrower shroud.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Interpretacja wyników pomiaru prędkości przepływu ładunku w komorze spalania tłokowego silnika spalinowego
: Interpretation of measurement results of flow velocity in the ICE combustion chamber
Autorzy:: Tutak, W.
Tematy:: pomiar
pole prędkości
komora spalania
measur
flow field
combustion chamber; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/151180.pdf Link otwiera się w nowym oknie
Opis:: W opracowaniu przedstawiono interpretację wyników pomiaru prędkości przepływu ładunku w komorze spalania tłokowego silnika spalinowego. Analizie poddano wpływ metody opracowania wyników pomiaru prędkości przepływu na uzyskane wyniki parametrów opisu pola prędkości w komorze spalania silnika tłokowego.
The paper presents measurement results of flow field of fresh charge in the combustion chamber of the internal combustion engine. Possibilities of interpretation results of flow velocity measurement in combustion chamber of internal combustion engine are presented in the paper. The data handling method of flow velocity measurement result influence on obtained turbulence field in combustion chamber parameters are analyzed. The results of research show that non-repeatability of flow velocity in the combustion chamber have influence on description of turbulence parameters.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Characteristics of the flow field in the combustion chamber of the internal combustion test engine
Autorzy:: Tutak, W.
Jamrozik, A.
Tematy:: silnik
metody pomiarowe
turbulencja
przepływ
engine
flow field
measurement
turbulence; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/185031.pdf Link otwiera się w nowym oknie
Opis:: Results of a research study into the velocity field in combustion chamber of internal combustion engine are presented in the paper. Measurements of fresh charge flow velocity in the cylinder axis and near the cylinder squeezing surface were performed. The hot-wire anemometer was used. The measurement results were used for analysis of turbulence field in the examined combustion chamber. It turned out that in the axis of cylinder the maximum of velocity occurs 30 deg before TDC and achieves 6 m/s. In the studied combustion chamber, the maximum value of turbulence intensity was close to 0.2 and it was achieved 35 deg BTDC. Additionally, the maximal velocity dispersion in the following cycles of the researched engine was at the level of 2 m/s, which is 35% of the maximum value of flow velocity. At a point located near the squeezing surface of the piston, a similar level of turbulence, but a the smaller value of the average velocity was achieved. The turbulence field turned out to be inhomogeneous in the combustion chamber.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: CFD simulation on wind turbine blades with leading edge erosion
Autorzy:: Wang, Yan
Wang, Liang
Duan, Chenglin
Zheng, Jian
Liu, Zhe
Ma, Gaosheng
Tematy:: wind turbine
leading edge erosion
flow field structure
aerodynamic performance; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2055055.pdf Link otwiera się w nowym oknie
Opis:: Deep understanding on the impacts of leading edge erosion on the performance and flow characteristics of wind turbines is significant for the blade design and wind farms manage- ment. Pitting erosion and three levels of delamination are considered in the present study. The results show that the degrees of leading edge erosion have great influence on the flow separation, tangential force coefficient, normal force coefficient as well as the power output of the wind turbine. Leading edge erosion has the greatest impact on aerodynamics of the wind turbine at 15m/s, where the maximum loss in the power output can reach up to 73.26%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Simulation and experimental study of SCR injection system
Autorzy:: Du, J.
Zhang, Y.
Cai, Y.
Tematy:: ammonia grille
flow field
uniformity
SCR test
the denitrification rate; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260223.pdf Link otwiera się w nowym oknie
Opis:: According to actual engineering test, we design a linear controlled spray ammonia grille, and apply it to the SCR injection system of ship tail gas treatment. In this paper, the geometric model of ammonia injection grid was built in the flue of diesel engine, and the effects of spray atomization, ammonia uniformity and urea droplet distribution on spray atomization were simulated. Then the test bench was set up to observe the injection status of the ammonia injection grille. The NOx content of the outlet was measured by the original data of the flue gas, and the experimental data were processed. We calculate the denitrification rate by taking the average value to verify the correctness of the spray ammonia grid scheme.
Dostawca treści:: Biblioteka Nauki

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