Te Whakapūtanga o te Papu: Te Ariā me te Tātaitanga
He tirohanga whānui mō te āhuatanga cavitation
Ko te pēhanga o te mimiti wai ko te pēhanga mimiti o te wai (te pēhanga mimiti kua mākū). E pā ana te pēhanga mimiti o te wai ki te pāmahana. Ka teitei ake te pāmahana, ka nui ake te pēhanga mimiti. Ko te pēhanga mimiti o te wai mā i te pāmahana rūma o te 20℃ he 233.8Pa. Ko te pēhanga mimiti o te wai i te 100℃ he 101296Pa. Nō reira, ka tīmata te mimiti o te wai mā i te pāmahana rūma (20℃) ina heke te pēhanga ki te 233.8Pa.
Ina whakaitihia te pēhanga o te wai ki te pēhanga mimiti i tētahi pāmahana, ka puta he mirumiru i roto i te wai, e kiia nei ko te cavitation. Heoi, ehara te mamaoa i roto i te mirumiru i te mea he mamaoa katoa, engari kei roto hoki he hau (te nuinga o te hau) i te āhua o te whakarewatanga, te karihi rānei.
Ina rere ngā mirumiru e puta mai ana i te wā o te cavitation ki te pēhanga teitei, ka heke te rahinga, ka pakū rānei. Ko tēnei āhuatanga e ngaro ai ngā mirumiru i roto i te wai nā te pikinga o te pēhanga ka kiia ko te cavitation collapse.
Te āhuatanga o te cavitation i roto i te papu
I te wā e mahi ana te papu, mēnā ko te rohe o tōna wāhanga waipuke (ko te tikanga kei muri i te tomokanga o te mata o te impeller). Mō ētahi take, ina heke te pēhanga tino o te wai e papua ana ki te pēhanga mimiti i te pāmahana o nāianei, ka tīmata te wai ki te mimiti ki reira, ka puta te mamaoa me te hanga mirumiru. Ka rere whakamua ēnei mirumiru me te wai, ā, ina tae ki tētahi pēhanga teitei, ka akiakihia ngā mirumiru e te wai pēhanga teitei e karapoti ana i ngā mirumiru kia mimiti tere, kia pakū rānei. Ina pakū te mirumiru, ka whakakīia te kōhao e ngā matūriki wai i te tere tere, ka tukinga tetahi ki tetahi hei hanga hama wai. Ka pakaru te waikura i ngā wāhanga o te waipuke ina puta ki te pakitara totoka.
Ko tēnei tukanga ko te tukanga cavitation papu.
Te awe o te cavitation papu
Whakaputa haruru me te wiri
Te kino o te waikura o ngā wāhanga o te au nui
Te hekenga o te mahi
Whārite taketake o te cavitation papu
Ko te tahua cavitation NPSHr-Pump e kiia ana ko te tahua cavitation e tika ana, ā, e kiia ana ko te pane pai kupenga e tika ana ki tāwāhi.
NPSHa - Ko te āheinga cavitation o te taputapu e kiia ana ko te āheinga cavitation whai hua, e whakaratohia ana e te taputapu momi. Ko te nui ake o te NPSHA, ko te iti ake o te tūponotanga ka cavitation te papu. Ka heke te NPSHa i te pikinga o te rere o te wai.
Te whanaungatanga i waenga i te NPSHa me te NPSHr ina rerekē te rere
Tikanga tatau mō te cavitation o te taputapu
hg=Pc/ρg－hc－Pv/ρg－[NPSH]
[NPSH]-Taurangi whakawātea e whakaaetia ana
[NPSH] = (1.1 ~ 1.5) NPSHr
Ina nui te rere o te wai, me tango he uara nui, ā, ina iti te rere o te wai, me tango he uara iti.
Wā tuku: Hanuere-22-2024