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 tse fetang hona joale 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 kutu ea likarolo tse fetang hona joale
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 ea cavitation e lumelletsoeng
[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