Cavitation of Pump: Khopolo le Palo
Kakaretso ea cavitation phenomenon
Khatello ea mouoane oa mokelikeli ke khatello ea mouoane ea mokelikeli (khatello ea mouoane e tletseng). Khatello ea mouoane ea metsi e amana le mocheso. Ha mocheso o phahame, khatello e kholo ea mouoane. Khatello ea mouoane ea metsi a hloekileng ka mocheso oa kamore ea 20 ℃ ke 233.8Pa. Ha khatello ea mouoane ea metsi ho 100 ℃ ke 101296Pa. Ka hona, metsi a hloekileng mochesong oa kamore (20 ℃) a qala ho fetoha mouoane ha khatello e theohela ho 233.8Pa.
Ha khatello ea metsi e fokotsehile ho khatello ea mouoane ka mocheso o itseng, mokelikeli o tla hlahisa li-bubble, tse bitsoang cavitation. Leha ho le joalo, mouoane ka bubble ha e le hantle ha se mouoane ka ho feletseng, empa hape o na le khase (haholo-holo moea) ka mokhoa oa ho qhibiliha kapa khubu.
Ha li-bubble tse hlahisoang nakong ea cavitation li phalla khatellong e phahameng, molumo oa tsona oa fokotseha esita le ho phatloha. Ketsahalo ena ea hore li-bubble li nyamela ka metsi ka lebaka la ho phahama ha khatello e bitsoa cavitation collapse.
Ketsahalo ea cavitation ka pompong
Ha pompo e sebetsa, haeba sebaka sa sebaka sa sebaka sa eona se phallang (hangata kae-kae ka mor'a ho kenngoa ha lehare la impeller). Ka lebaka le itseng, ha khatello e feletseng ea metsi a pumped e theohela khatellong ea mouoane ka mocheso oa hona joale, mokelikeli o qala ho fetoha mouoane moo, o hlahisa mouoane le ho etsa li-bubble. Lipululoana tsena li phallela pele le mokelikeli, ’me ha li fihla khatellong e itseng e phahameng, mokelikeli o phahameng o pota-potileng lipudula o qobella lipululana ho honyela haholo esita le ho phatloha. Ha bubble e phatloha, likaroloana tsa metsi li tla tlatsa sekoti ka lebelo le phahameng ebe li thulana ho etsa hamore ea metsi. Ketsahalo ena e tla baka tšenyo ea kutu ho likarolo tsa morao-rao ha e etsahala leboteng le tiileng.
Ts'ebetso ena ke ts'ebetso ea pompo ea cavitation.
Tšusumetso ea pompo cavitation
Hlahisa lerata le ho thothomela
Tšenyo ea ho bola ea likarolo tsa morao-rao
Ho senyeha ha tshebetso
Pump cavitation equation ea motheo
NPSHr-Pump cavitation allowance e boetse e bitsoa chelete e hlokahalang ea cavitation, 'me e bitsoa net positive head kantle ho naha.
NPSHa-The cavitation allowance ea sesebelisoa e boetse e bitsoa katleho ea cavitation allowance, e fanoang ke sesebelisoa sa ho hula. Ha NPSHA e le kholoanyane, ho na le monyetla o fokolang oa hore pompo e be cavitation. NPSha e fokotseha ka keketseho ea sephethephethe.
Kamano lipakeng tsa NPSHa le NPSHr ha phallo e fetoha
Mokhoa oa ho bala oa cavitation ea sesebelisoa
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Atumello e lumelletsoeng ea cavitation
[NPSH] = (1.1 ~ 1.5) NPSHr
Ha sekhahla sa phallo se le seholo, nka boleng bo boholo, 'me ha tekanyo ea phallo e le nyenyane, nka tekanyo e nyenyane.
Nako ea poso: Jan-22-2024