Taw qhia
Nyob rau hauv tshooj dhau los nws tau pom tias qhov xwm txheej lej tiag tiag rau lub zog uas tau siv los ntawm cov kua dej thaum so tuaj yeem tau txais.Qhov no yog vim hais tias nyob rau hauv hydrostatic tsuas yooj yim zog quab yuam koom nrog.Thaum xav txog cov kua hauv cov lus tsa suab, qhov teeb meem ntawm kev tsom xam ib zaug dhau los ua nyuaj dua.Tsis tsuas yog muaj qhov nrawm nrawm thiab qhov kev taw qhia yuav tsum tau coj mus rau hauv tus account, tab sis kuj tseem muaj kev cuam tshuam ntawm cov viscosity ua rau muaj kev sib txhuam los yog kev sib txhuam ntawm cov kua dej txav mus thiab ntawm cov ciam teb.Cov lus sib txheeb uas muaj peev xwm ua tau ntawm cov khoom sib txawv ntawm lub cev ua rau lub siab thiab kev ntxhov siab sib txawv los ntawm ib qho mus rau lwm qhov raws li cov xwm txheej ntws.Raws li cov complexities txuam nrog cov phenomenon ntws, ib tug meej kev soj ntsuam lej tsuas yog ua tau nyob rau hauv ob peb, thiab los ntawm engineering point of view, ib co dab tsi impractical, rooj plaub.Nws yog tsim nyog los daws cov teeb meem ntws los ntawm kev sim, los yog los ntawm kev ua. qee qhov kev xav yooj yim txaus kom tau txais kev daws teeb meem theoretical.Ob txoj hauv kev tsis yog kev sib koom ua ke, txij li cov kev cai lij choj ntawm kev siv tshuab yog ib txwm siv tau thiab ua kom muaj qee qhov theoretical txoj kev coj los siv rau ntau qhov tseem ceeb.Tsis tas li ntawd nws yog ib qho tseem ceeb kom paub tseeb tias qhov kev sib txawv ntawm qhov sib txawv ntawm cov xwm txheej tiag tiag tshwm sim los ntawm kev txheeb xyuas yooj yim.
Qhov kev xav yooj yim tshaj plaws yog tias cov kua dej yog qhov zoo tagnrho lossis zoo meej, yog li tshem tawm cov teebmeem viscous nyuaj.Qhov no yog lub hauv paus ntawm classical hydrodynamics, ib ceg ntawm kev siv lej uas tau txais kev saib xyuas los ntawm cov kws tshawb fawb tseem ceeb xws li Stokes, Rayleigh, Rankine, Kelvin thiab Lamb.Muaj cov kev txwv loj hauv cov kev xav hauv classical, tab sis raws li cov dej muaj cov viscosity tsawg, nws coj zoo li cov kua dej tiag tiag hauv ntau lub sijhawm.Vim li no, classical hydrodynamics tej zaum yuav suav hais tias yog ib qho tseem ceeb tshaj plaws keeb kwm yav dhau los ntawm kev kawm txog cov yam ntxwv ntawm cov dej txav.Cov tshooj tam sim no muaj kev txhawj xeeb nrog lub hauv paus kev ua haujlwm ntawm cov kua dej thiab ua haujlwm raws li cov lus qhia yooj yim rau cov tshooj uas ua tiav nrog cov teeb meem tshwj xeeb uas tau ntsib hauv civil engineering hydraulics.Peb qhov kev sib npaug tseem ceeb ntawm cov dej ntws uas yog, qhov txuas ntxiv, Bernoulli, thiab qhov sib npaug ntawm lub zog tau muab los thiab lawv qhov tseem ceeb tau piav qhia.Tom qab ntawd, cov kev txwv ntawm classical txoj kev xav tau txiav txim siab thiab tus cwj pwm ntawm cov kua dej tiag tiag tau piav qhia.Ib qho dej tsis sib haum yog suav tias yog thoob plaws.
Hom kev ntws
Ntau hom kev ua kua dej tuaj yeem raug cais raws li hauv qab no:
1.Turbulent thiab laminar
2.Rotational thiab irrotational
3. Tsis khov thiab tsis khov
4.Uniform thiab tsis-uniform.
MVS series axial-flow twj AVS series mix-flow twj (Vertical Axial flow thiab Mixed flow submersible dej phwj twj tso kua mis) yog cov khoom niaj hnub ua tiav tsim los ntawm kev siv cov tshuab niaj hnub txawv teb chaws.Cov twj tshiab lub peev xwm yog 20% loj dua cov qub.Qhov ua tau zoo yog 3 ~ 5% siab dua li qub.
Turbulent thiab laminar ntws.
Cov ntsiab lus no piav txog lub cev qhov dej ntws.
Nyob rau hauv turbulent flow, qhov kev loj hlob ntawm cov kua hais yog tsis xwm yeem thiab muaj ib tug seemingly haphazard interchange ntawm txoj hauj lwm.Individual particles yuav hloov pauv trans.nqe velocities kom cov lus tsa suab yog eddying thiab sinuous es tsis rectilinear.Yog tias dye raug txhaj rau ntawm ib qho chaw, nws yuav nrawm nrawm thoob plaws hauv cov kwj deg.Nyob rau hauv cov ntaub ntawv ntawm turbulent ntws nyob rau hauv ib tug yeeb nkab, piv txwv li, ib tug instantaneous kaw ntawm lub ceev ntawm ib seem yuav qhia ib tug kwv yees faib raws li qhia nyob rau hauv daim duab 1(a).Lub nrawm nrawm, raws li tau sau tseg los ntawm cov cuab yeej ntsuas ib txwm, tau qhia nyob rau hauv daim ntawv qhia dotted, thiab nws pom tseeb tias cov dej ntws ntws tawm yog tus cwj pwm los ntawm kev hloov pauv tsis tu ncua nyob rau ntawm lub sijhawm tsis tu ncua.
Fig.1(a) Ntsuag ntws
Fig.1(b) Laminar flow
Nyob rau hauv laminar ntws tag nrho cov kua hais mus raws li thaum uas tig mus txoj kev thiab tsis muaj transverse feem ntawm tshaj tawm.Txoj kev loj hlob zoo yog qhov uas txhua qhov ua raws nraim txoj hauv kev ntawm cov khoom ua ntej nws yam tsis muaj kev sib txawv.Yog li ib tug nyias filament ntawm dye yuav nyob twj ywm li xws li tsis muaj diffusion.Muaj ntau qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv hauv laminar ntws (Fig.1b) dua li hauv cov turbulent flow.Piv txwv li, rau cov yeeb nkab, qhov piv ntawm qhov nruab nrab tshaj tawm V thiab qhov siab tshaj plaws V max yog 0.5 nrog turbulent flow thiab 0. ,05 nrog laminar ntws.
Laminar ntws yog txuam nrog qis tshaj tawm thiab cov kua dej khov khov.Nyob rau hauv cov kav dej thiab qhib-channel hydraulics, cov kev tshaj tawm yuav luag ib txwm muaj siab txaus kom ntseeg tau tias cov dej ntws tawm, txawm hais tias nyias laminar txheej tseem nyob ze rau thaj tsam ruaj khov.Cov kev cai ntawm laminar ntws tau nkag siab tag nrho, thiab rau qhov yooj yim ciam teb cov kev faib tawm tuaj yeem txheeb xyuas lej.Vim nws qhov xwm txheej tsis tu ncua, cov dej ntws tawm tau tawm tsam kev kho lej nyuaj, thiab rau kev daws teeb meem, nws yog ib qho tsim nyog yuav tsum vam khom rau kev sib raug zoo ntawm empirical lossis semiempirical.
Vertical Turbine Hluav Taws Twj
Qauv No: XBC-VTP
XBC-VTP Series ntsug ntev ncej tua hluav taws twj tso kua mis yog series ntawm ib theem, multistage diffusers twj, tsim nyob rau hauv raws li qhov tseeb National Standard GB6245-2006.Peb kuj tau txhim kho tus qauv tsim nrog kev siv ntawm tus qauv ntawm United States Fire Protection Association.Nws yog tsuas yog siv rau cov dej tua hluav taws hauv petrochemical, natural gas, fais fab nroj tsuag, paj rwb textile, wharf, aviation, warehousing, high-rising building and other industries.Nws tseem tuaj yeem siv rau nkoj, dej hiav txwv tank, nkoj hluav taws thiab lwm yam khoom siv.
Rotational thiab irrotational flow.
Cov dej ntws tau hais tias yuav hloov pauv yog tias txhua cov kua dej muaj qhov nrawm nrawm txog nws qhov chaw loj.
Daim duab 2a qhia tau hais tias ib qho kev sib faib nrawm uas cuam tshuam nrog cov turbulent ntws dhau ntawm ib thaj tsam ncaj.Vim yog qhov tsis sib xws tshaj tawm kev faib tawm, ib qho particle nrog nws ob axes Ameslikas perpendicular suffers deformation nrog ib tug me me degree ntawm kev sib hloov.
txoj kev yog depicted, nrog tus tshaj tawm ncaj qha proportional rau lub vojvoog.Ob axes ntawm cov particle rotate nyob rau hauv tib txoj kev thiaj li hais tias cov ntws rov yog rotational.
Fig.2(a) Rotational flow
Rau qhov ntws los ua irrotational, qhov tshaj tawm faib nyob ib sab ntawm tus ciam teb ncaj nraim yuav tsum tsis sib xws (Fig.2b).Nyob rau hauv cov ntaub ntawv ntawm ntws nyob rau hauv ib ncig txoj kev, nws yuav qhia tau hais tias irrotational flow tsuas yog hais tias qhov tshaj tawm yog inversely proportional rau lub vojvoog.Los ntawm qhov pom thawj zaug ntawm daim duab 3, qhov no tshwm sim tsis zoo, tab sis kev tshuaj xyuas ze dua qhia tau tias ob lub axes tig rau hauv cov lus qhia sib txawv kom muaj cov txiaj ntsig zoo uas ua rau qhov nruab nrab ntawm cov axes uas tsis hloov pauv ntawm lub xeev pib.
Fig.2(b) Irrotational flow
Vim tias tag nrho cov kua dej muaj viscosity, qhov qis ntawm cov kua dej tiag tiag yeej tsis muaj kev sib hloov tiag tiag, thiab laminar ntws yog qhov tseeb heev.Yog li irrotational flow yog ib qho kev xav uas yuav yog kev kawm txaus siab-tsuas yog nws tsis yog rau qhov tseeb tias nyob rau hauv ntau zaus ntawm turbulent flow cov yam ntxwv hloov tsis tseem ceeb uas lawv yuav tsis saib xyuas.Qhov no yog qhov yooj yim vim tias nws muaj peev xwm txheeb xyuas qhov tsis sib haum xeeb los ntawm kev siv lej cov ntsiab lus ntawm classical hydrodynamics xa mus rau yav dhau los.
Centrifugal Hiav Txwv Dej Destination Pump
Qauv TSIS MUAJ: ASN ASNV
Model ASN thiab ASNV twj tso kua mis yog ib-theem ob chav suction split volute casing centrifugal twj thiab siv los yog kua tsheb thauj mus los rau cov dej ua hauj lwm, cua txias ncig, lub tsev, irrigation, dej twj tso kua mis chaw nres tsheb, hluav taws xob fais fab chaw nres tsheb, industrial water supply system, tua hluav taws. system, nkoj, tsev thiab lwm yam.
Tsis khov thiab tsis khov.
Cov dej ntws tau hais kom nyob ruaj khov thaum cov xwm txheej ntawm txhua qhov chaw tsis tu ncua nrog rau lub sijhawm.Ib qho kev txhais lus nruj ntawm qhov kev txhais no yuav ua rau qhov kev txiav txim siab tias cov dej ntws tawm tsis tau ruaj khov.Txawm li cas los xij, rau lub hom phiaj tam sim no nws yog qhov yooj yim rau kev saib xyuas cov dej dav dav raws li qhov ntsuas thiab qhov hloov pauv tsis raug cuam tshuam nrog kev kub ntxhov tsuas yog cuam tshuam thib ob.Ib qho piv txwv pom tseeb ntawm kev ntws tsis tu ncua yog qhov tso tawm tas li hauv cov kav dej lossis qhib channel.
Raws li kev sib koom ua ke nws ua raws li qhov dej ntws tsis ruaj khov thaum muaj xwm txheej sib txawv nrog rau lub sijhawm.Ib qho piv txwv ntawm cov dej tsis ruaj khov yog qhov sib txawv ntawm qhov tso tawm hauv cov kav dej lossis qhib channel;Qhov no feem ntau yog ib qho tshwm sim tsis tu ncua ua tiav rau, lossis ua raws li, qhov tso tawm tsis tu ncua.Lwm yam paub
piv txwv ntawm ib lub sij hawm ntau dua yog yoj yoj yoj thiab cyclic txav ntawm lub cev loj ntawm dej hauv tidal ntws.
Feem ntau ntawm cov teeb meem kev ua haujlwm hauv hydraulic engineering yog kev txhawj xeeb nrog kev ntws tsis tu ncua.Qhov no yog hmoov zoo, txij li lub sij hawm sib txawv ntawm cov dej tsis khov kho considerably nyuaj rau kev tsom xam.Raws li, nyob rau hauv tshooj no, kev txiav txim siab ntawm qhov tsis khov kho yuav raug txwv rau qee qhov xwm txheej yooj yim.Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov, txawm li cas los xij, ntau qhov xwm txheej ntawm cov dej tsis khov yuav raug txo kom nyob ruaj khov los ntawm kev tsim txiaj ntawm lub hauv paus ntsiab lus ntawm kev sib txheeb ze.
Yog li, ib qho teeb meem cuam tshuam nrog lub nkoj txav los ntawm cov dej tseem tuaj yeem rov hais dua kom lub nkoj nyob ruaj khov thiab dej nyob hauv kev txav;tib qho kev ntsuas rau qhov zoo sib xws ntawm cov kua dej behaviouris uas tus txheeb ze tshaj tawm yuav zoo ib yam.Ntxiv dua thiab, yoj kev txav hauv dej tob yuav raug txo kom tsawg
nyob ruaj khov los ntawm kev xav tias tus neeg soj ntsuam taug kev nrog cov nthwv dej ntawm tib lub nrawm.
Diesel cav Vertical Turbine multistage centrifugal inline shaft dej Drainage Pump Hom twj tso kua dej ntsug no feem ntau yog siv rau kev siv tsis muaj corrosion, kub tsawg dua 60 ° C, tshem tawm cov khib nyiab (tsis suav nrog fiber ntau, cov grits) tsawg dua 150 mg / L cov ntsiab lus ntawm cov dej phwj los yog dej khib nyiab.VTP hom ntsug dej twj tso kua mis yog nyob rau hauv VTP hom ntsug dej twj tso kua mis, thiab nyob rau hauv lub hauv paus ntawm qhov nce thiab lub dab tshos, teem lub raj roj lubrication yog dej.Muaj peev xwm haus luam yeeb kub hauv qab 60 ° C, xa kom muaj cov khoom nplej (xws li cov hlau nplaum thiab cov xuab zeb zoo, thee, thiab lwm yam) ntawm cov dej phwj tuaj lossis dej pov tseg.
Uniform thiab non-uniform flow.
Cov dej ntws tau hais tias tsis sib xws thaum tsis muaj qhov sib txawv ntawm qhov loj thiab kev coj ntawm lub nrawm vector los ntawm ib qho mus rau lwm qhov raws txoj kev ntws.Txhawm rau ua raws li cov ntsiab lus no, ob qho tib si ntawm qhov ntws thiab qhov nrawm yuav tsum yog tib yam ntawm txhua qhov kev sib tw.Non-uniform flow tshwm sim thaum lub nrawm vector sib txawv nrog qhov chaw, ib qho piv txwv yog ntws ntawm converging los yog diverging ciam teb.
Ob qho tib si ntawm cov kev hloov pauv ntawm kev khiav dej num yog muaj nyob rau hauv qhib-channel hydraulics, txawm hais tias nruj me ntsis, txij li cov dej ntws ib txwm mus rau asymptotically, nws yog lub xeev zoo tshaj plaws uas tsuas yog kwv yees thiab yeej tsis tau txais.Nws yuav tsum tau muab sau tseg tias cov xwm txheej muaj feem xyuam rau qhov chaw es tsis yog lub sij hawm thiab yog li ntawd nyob rau hauv cov ntaub ntawv ntawm cov ndlwg ntws (piv txwv li.pipes nyob rau hauv lub siab), lawv yog heev ywj siab ntawm lub khov kho los yog tsis ruaj tsis khov xwm ntawm cov ntws.
Lub sij hawm xa tuaj: Mar-29-2024