I-Cavitation yeMpompo: Ithiyori kunye nokubala
Isishwankathelo se-cavitation phenomenon
Uxinzelelo lwe-vaporization yolwelo luxinzelelo lwe-vaporization yolwelo (uxinzelelo lomphunga ogcweleyo). Uxinzelelo lwe-vaporization yolwelo lunxulumene nobushushu. Ukuphakama kweqondo lobushushu, ngakumbi uxinzelelo lwe-vaporization. Uxinzelelo lwe-vaporization lwamanzi acocekileyo kwindawo yokushisa ye-20 ℃ yi-233.8Pa. Ngelixa uxinzelelo lwe-vaporization lwamanzi kwi-100 ℃ yi-101296Pa. Ke ngoko, amanzi acocekileyo kubushushu begumbi (20℃) aqala ukuba ngumphunga xa uxinzelelo lwehla ukuya kwi-233.8Pa.
Xa uxinzelelo lwe-liquid luyancitshiswa kuxinzelelo lwe-vaporization kwiqondo lokushisa elithile, ulwelo luya kuvelisa amaqamza, okubizwa ngokuba yi-cavitation. Nangona kunjalo, umphunga kwi-bubble ngokwenene awukho ngokupheleleyo umphunga, kodwa uqulethe igesi (ingakumbi umoya) ngendlela yokuchithwa okanye i-nucleus.
Xa iibhubhu ezenziwe ngexesha lokuhamba kwe-cavitation ukuya kuxinzelelo oluphezulu, umthamo wabo uyancipha kwaye uqhume. Le nto yokuba amaqamza ayanyamalala kulwelo ngenxa yokunyuka koxinzelelo kubizwa ngokuba yi-cavitation collapse.
I-phenomenon ye-cavitation kwimpompo
Xa ipompo isebenza, ukuba indawo yendawo yenxalenye yayo yokuphuphuma (ngokuqhelekileyo kwindawo ethile emva kokungena kwe-impeller blade). Ngesizathu esithile, xa uxinzelelo olupheleleyo lolwelo olumponlweyo luwela kuxinzelelo lwe-vaporization kwiqondo lobushushu langoku, ulwelo luqala ukufunxa apho, luvelise umphunga kunye nokwenza amaqamza. La maqamza aqukuqela phambili kunye nolwelo, kwaye xa efikelela kuxinzelelo oluthile oluphezulu, ulwelo olunoxinzelelo oluphezulu olujikeleze amaqamza lunyanzela amaqamza ukuba ashwabane kabukhali ade agqabhuke. Xa iqamza ligqabhuka, amasuntswana olwelo aya kuzalisa umngxuma ngesantya esiphezulu aze angqubane ukuze enze isando samanzi. Lo mcimbi uya kubangela umonakalo wokonakala kumacandelo angaphezulu kwangoku xa usenzeka kudonga oluluqilima.
Le nkqubo yinkqubo yempompo ye-cavitation.
Impembelelo yempompo ye-cavitation
Ukuvelisa ingxolo kunye nokungcangcazela
Ukonakala kokonakala kwamacandelo angaphaya kwangoku
Ukuthotywa komgangatho wokusebenza
Impompo ye-cavitation equation esisiseko
Isibonelelo se-NPSHr-Pump cavitation ikwabizwa ngokuba yi-cavitation allowance efunekayo, kwaye ibizwa ngokuba yimfuneko net positive head phesheya.
I-NPSHa-Isibonelelo se-cavitation yesixhobo sikwabizwa ngokuba yi-cavitation allowance esebenzayo, enikezelwa sisixhobo sokufunxa. I-NPSHA enkulu, incinci incinci ipompo iya kuba yi-cavitation. I-NPSha iyancipha ngokunyuka kwezithuthi.
Ubudlelwane phakathi kwe-NPSHa kunye ne-NPSHr xa ukutshintshwa kokuhamba
Indlela yokubala ye-cavitation yesixhobo
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Imvume ye-cavitation evumelekileyo
[NPSH] = (1.1 ~ 1.5) NPSHr
Xa izinga lokuhamba likhulu, thatha ixabiso elikhulu, kwaye xa isantya sincinci, thatha ixabiso elincinci.
Ixesha lokuposa: Jan-22-2024