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    Wyświetlanie 1-9 z 9
    Tytuł:
    Flow velocity measurement methods using electrical capacitance tomography
    Metody pomiaru prędkości przepływu z zastosowaniem tomografii pojemnościowej
    Autorzy:
    Mosorov, V.
    Grudzień, K.
    Sankowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/407966.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    electrical capacitance tomography
    velocity profile
    statistical method
    elektryczna tomografia pojemnościowa
    profil prędkości
    metoda statystyczna
    Opis:
    The current methods of calculating the velocity field based on a twin-plane electrical capacitance system for multiphase flows are presented. The described methods allow to calculate the velocity profile of the multiphase flow in cross-section of industrial installation. The theoretical assumptions of the considered methods are also noticed. The main advantages and disadvantages of the authors’ flow velocity measurement methods are discussed.
    Artykuł przedstawia przegląd metod wyznaczania prędkości przepływu w oparciu o dwupłaszczowy system pojemnościowej tomografii procesowej. Zaprezentowane metody pozwalają na obliczenie profilu prędkości wielofazowych przepływów w przekroju poprzecznym instalacji przemysłowej. Przeprowadzono także dyskusję nad teoretycznymi założeniami omawianych metod oraz opisano główne zalety i wady autorskich metod pomiaru prędkości przepływów wielofazowych.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 1; 30-36
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Error of average velocity flow measurement in ventilation system channels
    Pogreshnost izmereniya sredney skorosti potoka v kanalakh ventilyatsionníkh sistem
    Autorzy:
    Gusentsova, E.
    Kovalenko, A.
    Pilavov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/793050.pdf
    Data publikacji:
    2011
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11A
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use and calibration of 5-hole pressure probes to measurement of airflow velocity
    Autorzy:
    Ruchała, P.
    Grabowska, K.
    Małachowski, P.
    Santos, L.
    Back, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/245287.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aerodynamic measurement
    turbomachinery
    measuring devices
    flow direction measurement
    multi-hole probes
    Opis:
    Multi-hole probes are simple and robust device to measurement of flow velocity magnitude and direction in wide range of angles of attack – up to 75°. They become popular as they may be easily use to measurement of unknown flow velocity, while optical methods, like PIV or LDA, require some knowledge about the flow for proper setting of measurement devices. Multi-hole probes are also more lasting in comparison with CTA hot-wire probes, which may be damaged by a dust. A multi-hole probe measures air pressure with one pressure tap on its tip and a few (usually 2, 4, 6 or more) taps on conical or semispherical surface of the probe tip. Based on measured pressures, some non-dimensional pressure coefficients are calculated, which are related to flow velocity direction (i.e. two angles in Cartesian or spherical coordinate system) and magnitude. Finding relations between these parameters is relatively complex, which for years was limiting application of multi-hole probes. The article summarizes methods of multi-hole probes calibration and use, which may be classified as nulling and non-nulling methods or – with other criteria – as global and local methods. The probe, which was presented in the article, was the 5-hole straight probe manufactured by Vectoflow GmbH and calibrated in the stand designed and manufactured at the Institute of Aviation. The local interpolation algorithm has been used for calibration, with some modifications aimed on mitigate of mounting uncertainty, which is related with the non-alignment of flow velocity direction and probe axis Results of calibration showed that the accuracy of presented methodology is satisfactory. The standard measurement uncertainty was assessed for 0.2° for the pitch angle and yaw angle, which is better than accuracy declared by the probe’s manufacturer (1.0°). The measurement uncertainty of the flow velocity is approximately 0.12 m/s, similarly like in manufacturer’s data.
    Źródło:
    Journal of KONES; 2018, 25, 2; 319-327
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamics-based measurement of the velocity of high-temperature smoke
    Autorzy:
    Wang, Haoyu
    Powiązania:
    https://bibliotekanauki.pl/articles/2204068.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermodynamics
    smoke
    flow velocity
    measurement
    Kalman filter
    algorithm
    Opis:
    In view of the high cost and difficulty of ensuring the accuracy in the measurement of fire smoke velocity, the measurement system developed using platinum resistance temperature detectors and an 8-bit microcontroller, is used to realize the fast measurement of high-temperature fire smoke velocity. The system is based on the thermodynamic method and adopts the Kalman filter algorithm to process the measurement data, so as to eliminate noise and interference, and reduce measurement error. The experimental results show that the Kalman filter algorithm can effectively improve the measurement accuracy of fire smoke velocity. It is also shown that the system has high measurement accuracy, short reaction time, low cost, and is characterized by high performance in the measurement of high-temperature smoke velocity in experiments and practice.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 1; 23--36
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research on velocity profiles in selected flow systems
    Autorzy:
    Kabaciński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933977.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska
    Tematy:
    velocity profiles
    air flow measurement
    closed conduits
    automated test stand
    differential pressure flowmeter
    Opis:
    A problem of measuring of velocity profiles with the use of a fully automated test stand is presented in this paper. Due to the installed measurement equipment and various software alternatives it is possible to assess the inlet effect and distribution of velocities in the vicinity of averaging Pitot tubes in order to determine the phenomena occurring in their vicinity (recirculation, main stream direction) and verify the numerical models of turbulence. Due to the stream recirculation in the vicinity of the probes tested in a wind tunnel, a two-way probe was used instead of a Pitot tube. A linear module with a stepper motor formed an integral part of the measurement system whereby it was possible to determine the position of the measurement probe with a precision of 0.1mm. The measuring anemometer location, the possibility of adjusting the stream mean velocities and data acquisition were established by means of an original program. As far as the research in pipelines is concerned - the resulting characteristics allow the uncertainty of measurement to be precisely determined, which should be accounted for during the determination of air fluxes at locations which are not included in the technical documentation of a flowmeter.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 3-4; 185-201
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Simple Technique for Measuring the Volumetric Flow Rate and Direction of Flow Inside a Pipe – The Single and Double Coils Sensors
    Autorzy:
    Al Jarrah, Asem Mohammad
    Powiązania:
    https://bibliotekanauki.pl/articles/2204044.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    volumetric flow rate sensor
    flow sensor
    flow direction detection
    velocity measurement
    high speed velocity measurement
    single coil sensor
    double coils sensor
    Opis:
    This work shows how a single coil wrapped on a pipe can be used to measure the volumetric flow rate inside the pipe and how by wrapping a second coil the flow direction can be detected. The developed method is very simple, accurate, and cover all the range of flow from low speed to high speed with more accuracy expected at high speed. Few turns are sufficient for the coils, no calibration is needed, and the method can be used for all kinds of nonmagnetic fluids even, with less accuracy, without the need to know the type of fluid inside the pipe. The principle of the developed method is theoretically explained and proved and then experimentally validated.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 290--298
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow averaging tube geometry improvement for K-factor stability increase
    Autorzy:
    Kabaciński, M.
    Pospolita, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/114099.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    velocity profiles
    air flow measurement
    closed conduits
    automated test stand
    flow averaging Pitot tube
    Opis:
    Fluid flow around two-profile averaging differential pressure sensor was investigated in this paper. Research concentrated particularly on fluid movement direction and velocity over the investigated flow sensor. Analysis was conducted experimentally in low velocity wind tunnel. Because of large number of measuring points placed very close to each other, it was decided that velocity profile measurement will be performed by means of fully automated test stand. Due to a recirculation of the stream in the vicinity of the probe tested in the wind tunnel, an original two-direction probe was used. A linear module with a stepper motor formed an integral part of the measurement system. The location of the measuring probe, the possibility of adjusting stream mean velocities and data acquisition was undertaken by means of a dedicated program. The above mentioned investigation method helped to improve the metrological properties of the flowmeter applying non symmetrical probe cross-section forced air stream to be redirected in the desired direction. This modification significantly increased K-factor value and stability of air flow through the contraction of the flowmeter.
    Źródło:
    Measurement Automation Monitoring; 2017, 63, 1; 2-5
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of disturbed flow after an elbow on metrological properties of a Flow Averaging Tube
    Autorzy:
    Kabaciński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/114498.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    velocity profile measurement system
    averaging Pitot tube
    Flow Averaging Tube K-factor
    elbow flow
    automated test stand
    Opis:
    Experimental results of air velocity profiles and Flow Averaging Tubes (FAT®) K-factor measured behind an elbow are presented in this paper. The pipeline diameter was D=150 mm, while the range of mean velocities w=9…30 m/s. Velocity profiles were determined both in the vertical and horizontal plane in the respective distances L/D of a pipeline from 3 to 18. In the places of the measured velocity profiles, three cross-sections of flow averaging tubes (circular, streamlined and two-profile) were placed to determine the characteristics of K-factor. Moreover, a fully automated test stand is presented in this paper. The completed experiment allows shortening the distance between an elbow and a flowmeter installation place and informing about the value of a correction factor, which can be used to minimize the measurement uncertainty of the air flow rate. It was stated that the horizontal plane is better to install a probe because of the velocity profile and better results of repeatability.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 1; 7-16
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of a flow channel to investigate velocity profiles of friction-reducing ship coatings
    Autorzy:
    Weisheit, J.
    Schneider, V. E.
    Serr, J. M.
    Hagemeister, N.
    Oeffner, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841545.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship coatings
    flow Channel
    vessel velocity
    laser Doppler velocimeter
    computational fluid dynamics
    AIRCOAT project
    reynolds averaged navier stokes
    measurement volume
    Opis:
    Reducing friction with specialised hull coatings or air lubrication technologies has a potential reducing energy consumption and emissions in shipping. The EU project AIRCOAT combines both by developing a passive air lubrication technology inspired by nature that is implemented on a self-adhesive foil system. Besides validating the friction reduction it is of high interest to understand the underlying mechanism that causes the reduction. Therefore, a flow channel was designed, that creates a stationary turbulent flow within a square duct allowing for non-invasive measurements by laser doppler velocimetry. The high spatial resolution of the laser device makes recording velocity profiles within the boundary layer down to the viscous sublayer possible. Determination of the wall shear stress τ enables direct comparison of different friction reduction experiments. In this paper we validate the methodology by determining the velocity profile of the flat channel wall (without coatings). We further use the results to validate a CFD model in created in OpenFOAM. We find that velocities along the longitudinal axis are generally in good agreement between numerical and experimental investigations.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 225-231
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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