Kev Kawm Simulation ntawm Sab Nraud Clamp Ultrasonic Flow Meter
Kev simulation kev kawm ntawm sab nraudclamp rauultrasonic flow metersuav nrog kev ua qauv thiab simulating cov ntsiab lus ua haujlwm thiab kev ua haujlwm ntawm cov ntsuas dej ntws los ua kom zoo dua nws cov qauv tsim, txhim kho kev ntsuas qhov tseeb, lossis ntsuas nws qhov kev ua tau zoo raws li kev ua haujlwm sib txawv.
Tus lej Simulation Modeling
Kev ua lej simulation yog siv los tsim cov qauv lej rau cov kua dej ntws thiab ultrasonic nthwv dej nthuav tawm, suav nrog cov dej sib npaug sib npaug thiab acoustic equations. Computational Fluid Dynamics (CFD) cov cuab yeej siv los ua qauv cov dej ntws. Cov cuab yeej no tuaj yeem simulate turbulence, flow velocity distribution, etc., thiab soj ntsuam qhov cuam tshuam ntawm ultrasonic yoj propagation. Raws li CFD, acoustic tsom xam yog ua los simulate propagation thiab xav txog ntawm lub teeb liab ultrasonic. Acoustic simulation software (xws li acoustic module hauv COMSOL Multiphysics) tuaj yeem siv los ua kom tiav qhov no. Finite Element Analysis (FEA) ntawm cov qauv ultrasonic sensor yog ua kom nkag siab txog nws qhov kev ua tau zoo nyob rau hauv cov xwm txheej sib txawv. FEA pab txheeb xyuas qhov cuam tshuam ntawm thermal expansion, vibration, thiab lwm yam, ntawm kev ntsuas ntsuas. Kev sib cuag ntawm lub sensor thiab lub raj xa dej yog txiav txim siab hauv qhov simulation los ntsuas nws cov txiaj ntsig ntawm kev sib kis ultrasonic.
Laboratory Verification thiab Optimization
Nyob rau hauv lub chaw soj nstuam, lub rooj ntev zaum ntsuam xyuas yog siv los ntsuas qhov tseeb ntws, thiab cov txiaj ntsig tau muab piv nrog cov txiaj ntsig simulation los txheeb xyuas qhov tseeb ntawm tus qauv simulation. Cov kev txwv ntawm cov qauv simulation raug hloov kho raws li kev sim ua kom pom tseeb qhov tseeb. Los ntawm kev simulation, lub sensor txoj hauj lwm, fixture tsim, thiab installation txoj kev yog optimized los txhim kho kev ntsuas qhov tseeb thiab stability. Ua raws li txoj caiclamp ntawm ultrasonic flow meter installation txheej txheemNws yog ib qho tseem ceeb thaum lub sij hawm no optimization txheej txheem, vim hais tias kev teeb tsa tsis raug tuaj yeem cuam tshuam qhov tseeb ntawm kev ntsuas. Cov xwm txheej sib txawv (xws li npuas, cov khoom siv) yog simulated hauv kev simulation los ntsuas lawv qhov cuam tshuam ntawm kev ntsuas dej ntws. Thaum lub sij hawm kev sim, cov khoom ntawm lub cev ntawm cov kua (xws li kub thiab siab) yuav tsum tau txiav txim siab, raws li cov khoom no cuam tshuam qhov ceev ntawm ultrasonic yoj propagation. Tsis tas li ntawd, suab nrov thiab cuam tshuam hauv qhov chaw tiag tiag tuaj yeem cuam tshuam qhov zoo ntawm lub teeb liab ultrasonic, uas tseem yuav tsum tau ua kom zoo dua ntawm cov teeb liab ua algorithms los ntawm kev simulations thiab kev sim.
COMSOL Multiphysics Simulation Analysis
Noj cov COMSOL Multiphysics 5.6 software ua piv txwv rau kev tsim qauv thiab simulation tsom xam, simulations tuaj yeem txheeb xyuas qhov cuam tshuam ntawm cov ces kaum sib txawv, cov khoom siv kav dej, cov yeeb nkab diameters, ultrasonic zaus, thiab kev teeb tsa ntawm ultrasonic yoj propagation. Daim duab schematic ntawm tus qauv ntsuas ntsuas ntsuas ultrasonic yog qhia hauv daim duab 3.6. Txhawm rau txhim kho cov kev ua tau zoo ntawm cov qauv 3D, peb feem ntau siv symmetry simulate ib nrab ntawm cov channel los sawv cev rau tag nrho cov qauv. Thaum lub sij hawm tsim qauv txheej txheem, kev cuam tshuam ntawm cov khoom sib txawv ntawm cov kav dej ntawm lub kaum sab xis ntawm ultrasonic refraction yuav tsum raug txiav txim siab, nrog rau qhov sib txawv kab rov tav txav deb ntawm ob lub transducers ntsia hauv cov yeeb nkab sib txawv.
Daim duab 3.6 Schematic Diagram ntawm Ultrasonic Flow Measurement Model Tsim
Transducer Installation Methods
Yuav kom ua tau raws li cov kev cai dav dav rau kev ntsuas cov yeeb nkab sib txawv, qhov sib txawv ua haujlwm zaus ntawm ultrasonic transducers thiab sib txawv transducer installation txoj kev yuav tsum tau siv nyob rau hauv ultrasonic txaus ntsuas. Covclamp ntawm hom ultrasonic flow metermuaj cov txiaj ntsig tshwj xeeb hauv qhov no, vim nws tso cai rau tsis muaj -kev cuam tshuam kev teeb tsa yam tsis tas yuav tsum tau txiav cov yeeb nkab lossis txheej txheem kaw. Cov txheej txheem kev teeb tsa muaj xws li V-shape, Z-shape, N-shape, thiab W-shape. Txhawm rau kawm txog qhov cuam tshuam ntawm kev sib txawv ntawm cov transducer installation txoj kev ntawm ultrasonic yoj propagation signals, nws yog ib qho tsim nyog yuav tsum tau ua cov kev tshawb fawb ntsig txog. Kab lus no tsuas yog siv Z-shape transducer installation method modeling simulation ua piv txwv rau kev ua qauv qhia.
Discontinuous Galerkin Method thiab Grid Division
Hauv COMSOL Multiphysics 5.6, "Convection Equation, Time Domain Explicit" interface module yog siv, thiab los ntawm lub neej ntawd, nws ua ib feem ntawm cov mis nrog quartic functions. Rau kev daws teeb meem yoj, txoj kev Discontinuous Galerkin tau raug pov thawj tias yog ib txoj hauv kev zoo. Txoj kev Discontinuous Galerkin ua kom yooj yim cov teeb meem ntawm kab sib faib hauv cov qauv loj, tso cai rau kev siv cov kab sib chaws dawb tetrahedral nrog ib nrab -wavelength loj, thiab thaum kawg daws tag nrho cov qauv. Hauv qhov sib faib kab sib faib tiag tiag, peb feem ntau teeb tsa cov phiaj xwm loj rau txhua tus nqi ntawm ib nrab ntawm lub wavelength thiab ob -feem peb ntawm ib lub wavelength kom tau txais kev daws teeb meem tsim nyog. Thaum siv lub sijhawm- sau meej meej solver, lub sij hawm sab hauv cov kauj ruam loj yog tswj hwm los ntawm COMSOL software, yog li cov kab sib chaws me tshaj plaws hauv cov qauv tswj lub sijhawm kauj ruam. Thaum teeb tsa tetrahedral kab sib chaws dawb, qhov siab tshaj plaws thiab yam tsawg kawg nkaus yuav tsum tau tswj. Hauv COMSOL Multiphysics 5.6, rau lub sijhawm "Convection Equation" -domain explicit interface, lub sij hawm sab hauv cov kauj ruam yuav raug xaiv raws li daim phiaj qib refinement thiab lub cev lub cev. Daim duab 3.7 qhia txog kab sib faib rau kev kawm keeb kwm yav dhau los tshaj tawm thiab cov suab paj nruag siv Z- qauv kev teeb tsa.
(a) Background Flow Velocity (b) Acoustics
Daim duab 3.7 Grid Division rau kev kawm keeb kwm yav dhau los khiav ceev thiab acoustics ntawm txawv sij hawm
Physical Field Configuration
Tom qab tus qauv tsim, lub cev yuav tsum tau teeb tsa. Cov dej hauv lub raj xa dej tau teeb tsa raws li laminar lossis turbulent flow lub cev los simulate cov kua hauv lub raj xa dej thaum siv tiag tiag; cov kua domain nyob rau hauv lub raj xa dej, lub raj xa dej, thiab cov transducers ntawm ob sab ntawm lub raj xa dej yog teem raws li "Convection Equation, Time Domain Explicit" lub cev teb los simulate kev nthuav tawm ntawm ultrasonic tsis. Nyob rau hauv "Convection Equation, Time Domain Explicit" kev teeb tsa lub cev, qhov kawg ntawm cov raj xa dej tau txhais tias yog impedance ciam teb kom txiav qhov kev suav. Nyob rau hauv laminar los yog turbulent simulations, cov kua inlet nyob rau sab laug, thiab lub qhov hluav taws xob kua yog nyob rau sab xis. Apluaj rauultrasonic flow meterconfiguration yog tsim los nrog ib tug ultrasonic transmitter ntsia rau hauv qab sab ntawm lub raj, thiab ib tug receiver ntsia rau sab saum toj. Ib txwm tshaj tawm yog siv rau ntawm qhov kawg transmitter kom emit ultrasonic tsis.
Fluid State Modeling thiab Analysis
Thaum siv COMSOL Multiphysics 5.6 software rau kev ntsuas ntsuas ntsuas ultrasonic, lub xeev cov dej hauv cov kav dej yuav tsum tau ua qauv thiab tshuaj xyuas ua ntej. Siv cov yeeb nkab PVC nrog ib txoj kab uas hla ntawm 15 hli thiab phab ntsa thickness ntawm 0.75 hli ua piv txwv, laminar thiab turbulent simulations tau ua. Cov kev simulation no yog qhov tseem ceeb rau kev nkag siab tias yuav ua li casultrasonic pluaj ntawm flow meterua nyob rau hauv ntau yam dej ntws. Laminar flow simulation siv lub "Laminar Flow" module hauv COMSOL Multiphysics 5.6 rau kev teeb tsa lub cev, thiab kev sib tw khiav dej num siv "Turbulent Flow, k-ω" module. Daim duab 3.8 qhia qhov loj ntawm keeb kwm ntws nrawm nyob rau hauv laminar thiab turbulent tej yam kev mob.
Los ntawm daim duab 3.8, nws tuaj yeem pom tau tias nyob rau hauv laminar flow tej yam kev mob, qhov khiav ceev nyob rau hauv txhua feem ntawm lub raj xa dej yuav luag zoo ib yam, ze rau qhov nruab nrab ntws tshaj tawm ntawm cov kua dej tom qab. Raws li daim duab kos duab, cov xim sib sib zog nqus nyob rau hauv nruab nrab ntawm lub raj xa dej qhia tau hais tias muaj kev khiav nrawm dua.
(a) Laminar Flow (b) Turbulent Flow
Daim duab 3.8 Magnitude ntawm Background Flow Velocity Nyob rau hauv cov dej sib txawv
Background Flow Velocity Analysis
Txhawm rau kom meej meej pom qhov ntws nrawm nyob rau hauv txhua feem ntawm cov kav dej, ib ntu ntawm cov kav dej tau raug xaiv los ua cov phiaj xwm keeb kwm yav dhau los nrawm nrawm. Daim duab 3.9 qhia txog keeb kwm ntws nrawm nrawm hauv qab laminar thiab turbulent flow conditions.
Rau cov yeeb nkab PVC nrog ib txoj kab uas hla ntawm 15 hli thiab phab ntsa thickness ntawm 0.75 hli, simulation tsom xam. Cov txiaj ntsig simulation siv "Laminar Flow" module tau qhia hauv daim duab 3.9(a). Nws tuaj yeem pom tau tias nyob rau hauv lub xeev laminar ntws, kev hloov pauv hloov tshwm sim tsuas yog nyob rau hauv 5 hli ntau ntawm cov yeeb nkab nto, thaum lub sijhawm ntws tawm ntawm lwm qhov chaw yog li 10 m / s, qhia tias cov dej kev paub dhau los nyob ze ntawm cov yeeb nkab phab ntsa vim cov yeeb nkab txhuam. Hauv qhov sib piv, cov txiaj ntsig simulation siv "Turbulent Flow, k-ω" module tau qhia hauv daim duab 3.9(b). Nws tuaj yeem pom tau tias nyob rau hauv qhov xwm txheej ntawm qhov nruab nrab ntws tshaj tawm ntawm 10 m / s, qhov nrawm nrawm ze ntawm cov yeeb nkab phab ntsa yog li 4.5 m / s, thiab qhov nrawm nrawm ntawm qhov nruab nrab ntawm cov kav xa dej tuaj yeem ncav cuag kwv yees li 12.2 m / s, nrog rau qhov ntws tawm ntawm qhov sib faib ua cov duab parabolic.
(a) Laminar Flow
(b) Nthuav dej ntws
Daim duab 3.9 Background Flow Velocity Curves Nyob rau hauv cov dej sib txawv
Tej zaum koj kuj yuav txaus siab rau cov ncauj lus no.
