Parshall flume paug qhov tseem ceeb Rau kev ntws dawb, qhov sib npaug los txiav txim siab tus nqi ntws tsuas yog Q=CHa qhov twg: Q yog tus nqi ntws (ft 3/ s) C yog tus nqi pub dawb rau cov flume (saib Daim duab 1 hauv qab) H a yog lub taub hau ntawm qhov ntsuas qhov tseem ceeb (ft)
Koj ntsuas Parshall flume li cas?
Parshall thiab nws txoj kev loj hlob ntawm cov flume. Dr. Parshall txiav txim siab tias qhov ntws yuav tsum ntsuas ntawm qhov taw tes uas 2/3 qhov ntev ntawm phab ntsa sib txuas ntsuas rov qab los ntawm caj pas. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov kev ncua deb tsis yog tsuas yog 2/3 ntawm qhov kev ncua deb rov qab los ntawm caj pas, tab sis 2/3 ntawm qhov ntev ntawm phab ntsa.
Koj ua li cas ntsuas Parshall flume?
Dej pov tseg: Calibrating Parshall Flume
- Ultrasonic qib transmitter. Nruab ib qho ultrasonic qib transmitter ntsuas qhov siab ntawm cov dej hauv caj pas ntawm flume. …
- Xaiv hom ntws. Ob qho xwm txheej ntawm kev ntws tuaj yeem tshwm sim los ntawm Parshall flume: dawb ntws thiab submerged ntws. …
- ntsuas qhov nrawm nrog lub pitot tube.
Parshall flume yog dab tsi?
Parshall Flume Accuracy
Raws li kev kuaj mob, Parshall Flumes tuaj yeem ua raug rau hauv +/-2%. Txawm li cas los xij, cov kev xav tau zoo xws li txoj hauv kev khiav, kev teeb tsa, thiab qhov ntev ntev ua rau muaj qhov tseeb ntawm qhov tsis pub dawb ntawm +/-5% (ib ASTM D1941).
Leej twgTsim Parshall flume?
Ib tus paub zoo tshaj plaws los kawm Colorado dej yog Ralph Parshall, leej twg tsim Parshall Flume. Lub Parshall Flume yog ib qho khoom siv uas, thaum muab tso rau hauv ib lub channel, ntsuas qhov ntws ntawm cov dej raws li nws tshwj xeeb cuam tshuam txog dej tob.
