Готові списки джерел за темами / Vortex flow meter

Добірка наукової літератури з теми "Vortex flow meter"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Vortex flow meter"

Muzipov, Kh N. "Vortex flow meter." Automation, Telemechanization and Communication in Oil Industry, no. 6 (2020): 11–16. http://dx.doi.org/10.33285/0132-2222-2020-6(563)-11-16.

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Shi, Shuo, Jian Ting Sun, Lan Lan Guo, and Guang Sheng Du. "Application of Vortex Generator in Ultrasonic Heat Meter Measurement." Advanced Materials Research 986-987 (July 2014): 1457–60. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1457.

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Fluids in the heat-supply pipelines have a small amount of impurities. Impurities can easily settle down on the ultrasonic heat meters’ reflecting faces. It caused measurement inaccuracy. Vortex generator is placed in ultrasonic heat meter in this paper, which can generate vortex in the reflect fields. Vortex toke away impurities on the bottom of heat meter. Reflecting surface keeps clean. A v-shaped ultrasonic heat meter is taken for example. Numerical study of the flow field near the Reflecting surface vortex generator is carried out. Results show certain strength of vortex is caused in the reflective surface, while other palaces influenced little.

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Juknevičius, Vaidas, and Jogundas Armaitis. "Lattice gas automaton modelling of a vortex flow meter: Strouhal–Reynolds number dependence." Lithuanian Journal of Physics 56, no. 4 (January 6, 2017): 191–99. http://dx.doi.org/10.3952/physics.v56i4.3415.

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Motivated by recent experimental and computational results concerning a three-dimensional structure of vortices behind a vortex shedding flow meter [M. Reik et al., Forsch. Ingenieurwes. 74, 77 (2010)], we study the Strouhal–Reynolds number dependence in the vortex street in two dimensions behind a trapezoid-shaped object by employing two types of Frisch–Hasslacher–Pomeau (FHP) models. Our geometry is intended to reproduce the operation of a vortex shedding flow meter in a two-dimensional setting, thus preventing the formation of a three-dimensional vortex structure. In particular, we check if the anomalous Reynolds–Strouhal number dependence reported for three dimensions can also be found in our two-dimensional simulation. As we find that the Strouhal number is nearly independent of the Reynolds number in this particular setup, our results provide support for the hypothesis that three-dimensional flow structures are responsible for that dependence, thus hinting at the importance of the pipe diameter to the accurate operation of industrial vortex flow meters.

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Miau, J. J., C. C. Yang, J. H. Chou, and K. R. Lee. "A T-shaped vortex shedder for a vortex flow-meter." Flow Measurement and Instrumentation 4, no. 4 (October 1993): 259–67. http://dx.doi.org/10.1016/0955-5986(93)90033-f.

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Duan, Quan Sheng, and Li Cui Wang. "Research on the Vortex Mass Flow Meter of Dual Bluff Body Based on Differential Pressure Principle." Applied Mechanics and Materials 401-403 (September 2013): 1110–13. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1110.

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The lower limit of the existing vortex mass flow meter based on differential pressure is high. So the application of the existing vortex mass flow meter is limited in the measurement for low flow rate. This paper proposes a method using vortex mass flow meter of dual bluff body based on differential pressure principle. The differential pressure signal between the upstream and downstream can be amplified by the vortex overlap caused by the dual bluff body structure. The results of the simulation by Fluent show that this method can reduce the lower limit of measurement, and improve the measurement sensitivity effectively.

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Mottram, R. C., and M. S. Rawat. "Installation Effects on Vortex Flowmeters." Measurement and Control 21, no. 8 (October 1988): 241–46. http://dx.doi.org/10.1177/002029408802100803.

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Most types of flowmeter are affected by flow disturbances caused by nearby pipe fittings. In the case of the vortex flowmeter, users currently have to rely on manufacturers' recommendations on minimum straight pipe lengths on either side of the meter as there are no relevant standards or codes of practice and little published experimental data. The paper presents some experimental results on the effects of upstream pipe roughness, single 90† bends, and pairs of 90† offset bends on the calibration in air of a vortex meter with a rectangular section bluff body. The results show that this particular vortex meter is sensitive to the roughness of the upstream pipework and required straight pipe lengths of about 55 diameters to avoid significant calibration changes caused by upstream bends. Installation lengths can be reduced by placing a flow straightener upstream of a meter particularly if the straightener-meter package can be calibrated as a unit. This concept has been explored using a Mitsubishi flow straightener with the vortex meter and promising results have been obtained with a package of 10 diameters overall length.

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Ghaoud, T., and D. W. Clarke. "Modelling and tracking a vortex flow-meter signal." Flow Measurement and Instrumentation 13, no. 3 (June 2002): 103–17. http://dx.doi.org/10.1016/s0955-5986(02)00020-1.

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Mahulikar, S. P., and S. K. Sane. "Theoretical Analysis of Experimentally Observed Perplexing Calibration Characteristics of Ball-in-Vortex Flow-Meter." Journal of Fluids Engineering 127, no. 5 (May 5, 2005): 1021–28. http://dx.doi.org/10.1115/1.1988342.

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This investigation analyzes the calibration nonlinearity of the ball-in-vortex flow-meter, designed to work on the principle of a rotating sphere in and due to a vortex flow. The comparison of this flow-meter reading with the standard flow-meter indicates the existence of different calibration regimes, bifurcated by a sharp change in slope of the calibration curve. Based on the governing mechanics of this flow-meter, this paper explains this nonlinearity, and proposes its mathematical form. In particular, the bifurcation in calibration characteristics is attributed to the change in the surface contact frictional force, due to translation of the ball. The mathematical model captures the various calibration regimes associated with this translation, from one plane of rotation in the flow-meter to another, or from one periphery to another. Thus, calibration nonlinearity of this flow-meter can be fully comprehended through its governing mechanics, and harnessed for flow measurement.

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Qi, Liu, and Lin Zhe. "Numerical study on the flow characteristics in swirl meter." Measurement and Control 52, no. 3-4 (March 2019): 183–92. http://dx.doi.org/10.1177/0020294019827334.

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The swirl meter (vortex precession flow meter) popularly used in natural gas industry is a kind of velocity flow meter with high turndown ratio and well performance in low flow measurement and other known advantages. In order to further understand the flow pattern of swirl meter to further improve its performance, computational fluid dynamics simulations are used to simulate the flow and predict the coefficient for swirl meter at different flow rates. Using renormalization group k–ε turbulent model and SIMPLEC algorithm, numerical simulations have been performed through commercial codes Fluent, and meter coefficients are also obtained experimentally to validate the numerical results. The simulated velocity and pressure in swirl meter are analyzed in detail, which are time-averaged distributions during a time period based on the transient numerical simulation. It is found that centerline pressure is lowest at the outlet of the swirler and rises gradually along the axial direction. While near-wall pressure presents an opposite variation tendency, it is significantly low at the end of throat due to strong influence of vortex precession. Centerline velocity increases as the flow approaches throat and reaches its maximum at center region of throat, and then it decreases and keeps relatively stable at downstream of divergent section. Both time-averaged pressure and axial velocity distributions are axisymmetric, and pressure variation is small on the cross section at the end of throat, although vortex precession is strong.

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Li, Bin, Chengyi Wang, and Jie Chen. "A Frequency-Correcting Method for a Vortex Flow Sensor Signal Based on a Central Tendency." Sensors 20, no. 18 (September 20, 2020): 5379. http://dx.doi.org/10.3390/s20185379.

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A vortex flow meter employs a sensor based on the piezoelectric vibration principle to realize vortex signal acquisition, and therefore the measurement results are susceptible to vibration noise. In this paper, the generalized mode method is proposed based on the central tendency characteristic of the vortex signal and combined with the existing filter bank method. The method combining filter bank with the generalized mode is designed and applied in the signal-processing system of the vortex flow meter, which makes up for the defect that the filter bank method cannot filter out the noise in the sub-band. The simulation experiments verify the feasibility and anti-interference performance of the algorithm. Meanwhile, a comparison with two FFT (Fast Fourier Transform) spectrum analysis methods shows that the algorithm designed in this paper requires a smaller sample size and achieves better real-time performance. The actual anti-vibration experiment and calibration experiment verify that the signal-processing system of a vortex flow meter ensures good accuracy and repeatability.

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Більше джерел

Дисертації з теми "Vortex flow meter"

Lais, Christian. "Extension of a Vortex flow transducerconcept to high pressure applications." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156725.

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This master thesis project has been carried out in cooperation with the Endress+Hauser Flowtec AG in Switzerland. The project was part of a bigger predevelopment project for a vortex flow meter in the research and development department of Endress+Hauser. Prowirl (vortex) flow meters are often used for measuring the volume flow in steam applications. This measurement method is based on the phenomena of vortices occurring behind obstacles in a stream which are registered by a sensor. Aim of the project was to develop and test a new vortex flow transducer concept for highest pressure applications (line pressure of 250 bars). Endress+Hauser already had a sensor for such applications which was outdated and not compatible to the newer generation of sensors. Two concepts with and without a temperature sensor option have been generated. The concepts have been modeled and verified via FE-analysis and analytical calculations according to the relevant standards (ASME Boiler and Pressure Vessel Code and EN 13445). After the calculations prototypes have been manufactured and tested. The conducted tests matched the simulations well and proved that the concept worked. More detailed tests after this thesis project are necessary to transfer the concept into a final product. However, it has been shown that the new concept has significant advantages over the existing highest pressure sensor. These are a bigger pressure range, the option of integrating a temperature sensor and a cost reduction for the flow meters compared to the existing design. Keywords: Vortex, Flow meter, Sensor, Water hammer
Detta examensprojekt har utförts i samarbete med Endress+Hauser Flowtec AG i Schweiz. Projektet har varit en del av ett större inledande projekt kring en virvelflödesmätare under avdelningen för forskning och utveckling hos Endress+Hauser. Prowirl(virvel)flödesmätare används ofta för mätning av volymflöde i ångapplikationer och tekniken bygger på sensorregistrering av fenomenet virvelbildning som uppstår nedströms hinder i ett flöde. Målet med projektet var att utveckla och testa en ny virvelflödesmätare för högtrycksapplikationer (ledningstryck upp till 250 bar). Sensorn som Endress+Hauser redan hade för sådan applikation var föråldrad och inte kompatibel med nyare generationer av sensorer. Två koncept har tagits fram, ett med och ett utan temperatursensor. Koncepten har modellerats och verifierats genom FEM och analytiska beräkningar enligt relevanta standarder (ASME Boiler and Pressure Vessel Code och EN 13445), efter vilket prototyperna tillverkats och testats. De utförda testerna överensstämde väl med simulationerna och bevisade att koncepten fungerade. Mer utförliga tester efter detta examensprojekt är nödvändigt för att med koncepten som utgångspunkt skapa en klar produkt. Men det har visats att dessa koncept har väsentliga fördelar över den befintliga högtryckssensorn. Bland dem kostnadsreducering, möjlighet för integrering av temperatursensor och breddat tryckspann jämfört mot den existerande designen. Nyckelord: Virvel, Flödesmätare, Sensorer, Vattenslag

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Besnard, Stephane. "Performance and application of the Modular Acoustic Velocity Sensor (M.A.V.S.) current meter for laboratory measurements." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1538.

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Every type of current meter is different and has its proper characteristics. Knowing the performance of a current meter is essential in order to use it properly either for field or laboratory measurements (such as in the Offshore Technology Research Center wave basin). A study of the MAVS (Modular Acoustic Velocity Sensor) in a wave basin is a first step essential for later deployment in real studies. This thesis is based on data obtained from different series of laboratory measurements conducted in the OTRC wave basin. The objective of the first part of the study was to characterize the MAVS frequency response using benchmarks such as tow tests or wave tests. These benchmarks allowed us not only to characterize the sensor but also to eventually correct some of the measurement distortions due to flow blockage, vortex shedding, or vibrations of the mounting structure, for example. After the preliminary study was done, we focused on the potential use of the MAVS in the OTRC wave basin. Indeed, in the case of a study of a scale model in the wave basin, the stresses applied to the model have to be accurately known. In the case of current-induced loads, this includes contributions from both the mean flow and the turbulence. Thus, after correcting the values measured by the MAVS, a mapping of the current jet was executed to determine its three-dimensional structure in the wave basin. Knowing the structure of the current in the OTRC wave basin, it was then possible to define a domain in which the current can be considered uniform with a certain tolerable error. This domain of uniformity will allow us to validate the use of the OTRC wave basin to study large models such as FPSOs (Floating Production, Storage and Offloading Units).

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Мельник, Анастасія Миколаївна. "Витратомір". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/35097.

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Дипломний проект складається з вступу, двох розділів, переліку посилань і додатків. Загальний об’єм складає 52 сторінки, 5 таблиць, 22 рисунки. Метою роботи є створення витратоміра, оцінка його метрологічних характеристик, розрахунок конструктивних і технологічних параметрів. Для досягнення мети проаналізовано методи вимірювання витрати, що набули найбільшого поширення у вимірювальній практиці, їх недоліки і переваги; розроблено схему вимірювання витрати; оцінено метрологічні характеристики вимірювача; у інтегрованій системі автоматизованого проектування SolidWorks створено тривимірну модель витратоміра. У технологічному розділі була описана конструкція приладу,розраховані критерії технологічності приладу та розмірний ланцюг,побудовані схема складального складу та технологічна схема складання.
The diploma project consists of an introduction, two sections, a list of references and appendices. The total volume is 52 pages, 5 tables, 22 figures. The purpose of the work is to create a flow meter, assess its metrological characteristics, calculation of design and technological parameters. To achieve this goal, the methods of measuring the costs that have become the most common in measurement practice, their disadvantages and advantages are analyzed; the scheme of measurement of a expense is developed; metrological characteristics of the meter are estimated; a three-dimensional flowmeter model has been created in the integrated SolidWorks computer-aided design system. In the technological section the design of the device was described, the criteria of manufacturability of the device and the dimensional chain were calculated, the scheme of assembly structure and the technological scheme of assembly were constructed.

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Laurantzon, Fredrik. "Flow measurements related to gas exchange applications." Doctoral thesis, KTH, Strömningsfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94133.

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This thesis deals with flow measuring techniques applied to steady and pulsating gas flows relevant to gas exchange systems for internal combustion engines. Gas flows in such environments are complex, i.e. they are inhomogeneous, three-dimensional, unsteady, non-isothermal and exhibit significant density changes. While a variety of flow metering devices are available and have been devised for such flow conditions, the performance of these flow metersis to a large extent undocumented when a strongly pulsatile motion is superposed on the already complex flow field. Nonetheless, gas flow meters are commonly applied in such environments, e.g. in the measurement of the air flow to the engine or the amount of exhaust gas recirculation. The aim of the present thesis is therefore to understand and assess, and if possible to improve the performance of various flow meters under highly pulsatile conditions as well as demonstrating the use of a new type of flow meter for measurements of the pulsating mass flow upstream and downstream the turbine of a turbocharger. The thesis can be subdivided into three parts. The first one assesses the flow quality of a newly developed flow rig, designed for measurements of steady and pulsating air flow at flow rates and pulse frequencies typically found in the gas exchange system of cars and smaller trucks. Flow rates and pulsation frequencies achieved and measured range up to about 200 g/s and 80 Hz, respectively. The time-resolved mass flux and stagnation temperature under both steady and pulsating conditions were characterized by means of a combined hot/cold-wire probe which is part of a newly developed automated measurement module. This rig and measurement module were used to create a unique data base with well-defined boundary conditions to be used for the validation of numerical simulations, but in particular, to assess the performance of various flow meters. In the second part a novel vortex flow meter that can measure the timedependent flow rate using wavelet analysis has been invented, verified and extensively tested under various industrially relevant conditions. The newly developed technique was used to provide unique turbine maps under pulsatile conditions through time-resolved and simultaneous measurements of mass flow, temperature and pressure upstream and downstream the turbine. Results confirm that the quasi-steady assumption is invalid for the turbine considered as a whole. In the third and last part of the thesis, two basic fundamental questions that arose during the course of hot/cold-wire measurements in the aforementioned high speed flows have been addressed, namely to assess which temperature a cold-wire measures or to which a hot-wire is exposed to in high speed flows as well as whether the hot-wire measures the product of velocity and density or total density. Hot/cold-wire measurements in a nozzle have been performed to test various hypothesis and results show that the recovery temperature as well as the product of velocity and stagnation density are measured.
QC 20120510

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Alam, Muhammad Shafiqul. "Lattice Boltzmann modelling of two and three-dimensional flow and scour around offshore pipelines." University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0161.

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[Truncated abstract] The hydrodynamic forces on a marine pipeline and the local scour around it are the most serious and important issues in designing and maintaining pipelines. This thesis explores the vortex shedding phenomena for the flow over smooth surface and rough surface isolated cylinders. This thesis also explores the two-dimensional and three-dimensional scour process beneath offshore pipelines numerically. A series of numerical models are proposed in this dissertation for the prediction of flow characteristics and the time development of local scour around pipelines. All the models presented in this thesis are deliberately developed based on novel lattice Boltzmann method (LBM), because in recent years it has been considered as a serious alternative to standard computational fluid dynamics (CFD) as it is ideally suited to massively parallel computations. The lattice Boltzmann method is described in details to reveal how it recovers the Navier- Stokes equations. Various grid refinement schemes available in literature are discussed and a slightly modified new scheme is proposed to remove oscillatory solutions at high velocity change regime. The proposed scheme is then validated against bench mark tests for low Reynolds number flow. A turbulent model based on LBM is developed in order to predict the vortex shedding flow around an isolated square smooth surface cylinder. The various local and global flow parameters and structure of vortices are validated against experimental and numerical data available in literature. The model is then extended to investigate the vortex shedding flow over an isolated rough surface cylinder as it has an engineering significance in the design process of pipelines. The model is employed to investigate the influence of pipe roughness on various local and global parameters of flow. ... Significant part of this thesis is aimed at modelling flow and local scour around pipelines employing LBM and cellular automata (CA) methods. The erosion mechanism of the CA method available in literature for sand particles is improved by defining the threshold of sediment entrainment on bed in a similar manner to that employed in the traditional scour models. The predicted scour profiles for various incoming flow conditions are found to compare well with the experimental results reported in the literature. The existence of lee wake erosion due to continuous generation of vortex shedding in the lee of the pipelines is revealed. The time development of the maximum scour depth below the pipe is also found to be in good agreement with the experimental measurements reported in literature Finally, a three-dimensional flow and scour model is developed in order to explore the scour process beneath pipelines. It is revealed that the three-dimensionality effects are more pronounced near the span shoulder. On the other hand, there exists a two-dimensional scour regime in the vicinity of the middle section of the suspended pipe. It is found that the propagation speed of the scour hole in the sapnwise direction remains almost constant at all stages of scour process.

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Книги з теми "Vortex flow meter"

Siegwarth, J. D. Vortex shedding flow meter performance at high flow velocities. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Siegwarth, J. D. Vortex shedding flow meter performance at high flow velocities. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Siegwarth, J. D. Vortex shedding flow meter performance at high flow velocities. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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Boyes, Walt, and David W. Spitzer. The Consumer Guide to Vortex Shedding and Fluidic Flowmeters. Copperhill and Pointer, Inc., 2002.

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Farajallah, Hishman. A study on the feasibility of metering gas-solid flows with vortex meters. 1990.

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Тези доповідей конференцій з теми "Vortex flow meter"

Chu, Beatrice C., Trevor P. Newson, and David A. Jackson. "Fiber-optic-based vortex shedder flow meter." In ECO4 (The Hague '91), edited by Oliverio D. Soares. SPIE, 1991. http://dx.doi.org/10.1117/12.46991.

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Akresh, M., L. Reindl, and W. D. Walker. "Improved vortex flow meter using pre-filter." In 2008 2nd International Conference on Signals, Circuits and Systems (SCS). IEEE, 2008. http://dx.doi.org/10.1109/icscs.2008.4746877.

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Hoadley, S. F., and F. Al-Mutairi. "Vortex Meter Application for SCADA System Multiphase Flow Measurement." In Abu Dhabi International Petroleum Exhibition and Conference. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/87274-ms.

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Cao Suosheng, Fang Lide, Li Jinhai, and Kong Xiangjie. "Wet gas measurement characteristics of a vortex flow meter." In 2nd International Conference on Computer and Automation Engineering (ICCAE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccae.2010.5451557.

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Chao Wang and Qin Liu. "Influence of droplet diameter on vortex flow meter in steam flow measurement." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5988137.

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HANSEN, E., and J. RESTREPO. "Development of a small vortex shedding flow meter for hypergolic propellants." In 1st National Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-3602.

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Lingjun Meng and Hang Huang. "The design of a vortex flow-meter with anti-vibration structure." In 2012 IEEE Symposium on Electrical & Electronics Engineering (EEESYM). IEEE, 2012. http://dx.doi.org/10.1109/eeesym.2012.6258742.

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Sun, Hongjun, Pan Yang, Chao Wang, and Wuliang Yin. "Anti-vibration design and research of four-wire type vortex flow meter." In 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC ). IEEE, 2018. http://dx.doi.org/10.1109/i2mtc.2018.8409660.

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Fu, Xin, and Huayong Yang. "Development of an Anti-Interference Swirl Meter Based on Numerical Simulation of Hydrodynamic Vibration." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2095.

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Анотація:

Abstract Having the advantages of no motion elements, high reliability, undemanding maintenance and good medium flexibility, the swirl meter has been widely used to measure the gas, liquid and steam in chemical, petroleum as well as processing industries. For the current one-piezoelectric-pressure-sensor swirl meter, however, the measuring error caused by the interference pressure oscillation limits its application in the system where pressure is unsteady, or a noisemaker is nearby. In this paper, the fluid dynamic features inside the channel of the swirl meter are studied numerically and by experiment. The time dependent vortex motions as well as the hydrodynamic vibrations within the channel of the swirl meter are simulated using the CFD approaches of the RNG k-ε model. The computed flow fields indicate that the eccentric motion of vortexes initiates an axisymmetric pressure oscillation within the vortex precession area of the swirl meter. The frequency of the oscillation shifts linearly with volume flow rates. Both the calculated and the measured results prove that the hydrodynamic vibrations on the arbitrary axisymmetric points are equal in amplitude and frequency but with a 180 degree phase difference. By installing differential pressure transducers on such the axisymmetric points, the signals of the vortex pressure oscillations are enhanced, while the interferential signals are suppressed, enabling the anti-interference performance and low-flowrate sensibility of the swirmeter to be effectively improved.

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Norizan, Tajul Ariffin, Zambri Harun, Wan Hanna Melini Wan Mohtar, and Shahrir Abdullah. "Characteristics of Swirl Angle in Pump Intake Flow Near the Minimum Inlet Submergence." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5053.

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Анотація:

Abstract Swirling flow in pump sump intake has been the subject of discussion for the past decades due to the detrimental effects brought about by its existence. Among the effects of swirling flow are reduced pump efficiency, cavitation, excessive vibration and load imbalance at the pump impeller which are caused by hydraulic problems associated to swirling flow such as swirls and vortices. One of the remedial measures for preventing such occasion is by keeping the pump inlet submerged above a defined value known as the minimum inlet submergence. It is the minimum submergence required to reduce the probability of the occurrence of free surface vortices. However, this requirement may not be fulfilled in some situations due to on site conditions or operational restrictions. In this paper, an experimental study was conducted to investigate the characteristics of swirl angle in the pump intake flow when the pump inlet is submerged near the value of minimum inlet submergence. The ratio of pump submergence to the minimum submergence was varied between 0.8 to 1.2 with constant inlet Froude Number which referred to as submergence ratio. The strength of the swirl in the intake flow was determined by measuring the swirl angle which was accomplished using a swirl meter attached in the suction pipe. Measurements using Acoustic Doppler Velocimeter (ADV) was performed to capture the velocity profile in the intake sump. The swirl angle distribution across the range of submergence ratios was dominated by a subsurface vortex formed at the sump floor. As soon as the submergence was reduced below the minimum submergence, a free surface vortex emerged near the pump inlet and brought a swirl retardation effect to the swirl meter rotation resulting in a bigger fluctuation of the swirl meter reading. An anti vortex device (AVD) called the floor splitter commonly used to reduce vorticity at pump inlet was installed and its effect on the reduction of swirls and vortices was evaluated.

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Звіти організацій з теми "Vortex flow meter"

Siegwarth, J. D. Vortex shedding flow meter performance at high flow velocities. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.tn.1302.

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