Nhanganyaya kune zvakajairika pombi mazwi (1) - kuyerera mwero + mienzaniso

1.Kuyerera-Inoreva huwandu kana huremu hwemvura inounzwa nepombi yemvurapanguva yeyuniti.Inotaridzwa naQ, zvikamu zvekuyera zvinowanzoshandiswa m3/h, m3/s kana L/s, t/h.

2.Musoro-Inoreva kuwedzera kwesimba rekutakura mvura neunit gravity kubva kunopinza kuenda kunobuda pombi yemvura, kureva kuti, simba rinowanikwa mushure mekunge mvura ine unit gravity ichipfuura nepapombi yemvura. Inotaridzwa nah, chikwata iNm/N, iyo inogaro kuratidzwa nekukwirira kwekoramu yemvura panopombwa mvura; Injiniya dzimwe nguva inoratidzwa nekumanikidzwa kwemuchadenga, uye chikamu chemutemo kPa kana MPa.

 ( Notes: Chikamu: m/p = ρ gh)

Maererano netsanangudzo:

H=E_d-E_s

E_d-Energy per unit huremu hwemvura painobuda flange yepombi yemvura;

Es-Energy per unit huremu hwemvura pane inopinza flange yepombi yemvura.

E_d=Z _d + P _d/ ρg + V²_d /2g

E_s=Z _s+ P_s / ρg+V²_s /2g

Kazhinji, musoro uri pazita repombi unofanirwa kusanganisira zvikamu zviviri zvinotevera. Chimwe chikamu ndicho chinoyerwa chemusoro wepamusoro, ndiko kuti, kureba kwakatwasuka kubva pamusoro pemvura yedziva rekupinda kusvika pamvura yedziva rekubuda. Inozivikanwa semusoro chaiwo, chikamu chayo kurasikirwa kwekuramba munzira apo mvura inopfuura nepapombi, saka pakusarudza musoro wepombi, inofanira kunge iri nhamba yemusoro chaiwo uye kurasikirwa kwemusoro, kureva:

Muenzaniso wekuverenga musoro wepombi

Kana uchida kupa mvura kuchivakwa chepamusoro-soro, fungidzira kuti mvura iripo papombi inosvika 50m.³/ h, uye kureba kwakatwasuka kubva pamusoro pemvura yedziva rekupinda kusvika padanho repamusoro remvura yekusvitsa i54m, kureba kwepombi yekuunza mvura inosvika 150m, dhayamita yepombi iФ80mm, nevharuvhu imwe yepasi, vharafu imwe yegedhi uye imwe isingadzoki vharafu, uye masere 900 anokotama ne r/d = z, yakakura sei iyo pombi musoro kuzadzisa zvinodiwa?

Solution:

Kubva pakusuma pamusoro, tinoziva kuti musoro wepombi ndewekuti:

H =H_chaiye +H _kurasikirwa

Ikoko: H ndiko kureba kwakatwasuka kubva pamusoro pemvura yetangi yekupinza kusvika padanho repamusoro rinotakura mvura, kureva: H_chaiye=54m

H_kurasikirwandeye marudzi ese ekurasikirwa mupombi, ayo anoverengerwa sezvinotevera:

Mapaipi anozivikanwa ekusveta uye emvura, magokora, mavharuvhu, mavharuvhu asingadzoke, mavharuvhu epasi uye mamwe madhayamita epombi ari 80mm, saka nzvimbo yaro yakachinjika ndeye:

Kana kuyerera kuri 50 m³/h (0.0139 m³/s), iyo inoenderana avhareji yekuyerera mwero ndeye:

Kurasikirwa kwekupokana pamwe nedhayamita H, maererano nedata, kana chiyero chekuyerera kwemvura chiri 2.76 m / s, kurasikirwa kwe100-mita zvishoma yakasvibiswa simbi pombi ndeye 13.1 m, inova inodiwa yeiyi chirongwa chekupa mvura.

Kurasikirwa kwepombi yekudhonza, gokora, vharafu, cheki vharafu uye vharafu yepasi ndizvo2.65m.

Velocity musoro wekuburitsa mvura kubva mumuromo:

Nokudaro, musoro wose H wepombi ndeye

H _musoro= H _chaiye + H _{kurasikirwa zvachose}=54+19.65+2.65+0.388 = 76.692 (m)

Pakusarudza mvura yakakwirira-inokwira, pombi yemvura inoyerera inoyerera isiri pasi pe50m³/ h uye musoro kwete pasi pe77 (m) inofanira kusarudzwa.