Sesimba rinodzokororwa rinokurumidza kupindura, simba remvura rinowanzoita basa rekudzora zvakanyanya uye kudzora mafrequency mu power grid, zvinoreva kuti mayuniti emagetsi emvura anowanzo fanirwa kushanda mumamiriro ezvinhu akasiyana nemamiriro ekugadzira. Nekuongorora data rakawanda rekuyedza, zvinoratidzwa kuti kana turbine ichishanda mumamiriro asiri ekugadzira, kunyanya mumamiriro ezvinhu emutoro wechikamu, kumanikidza kwakasimba kuchaonekwa mudhirowa yedhirowa ye turbine. Kuderera kwekukurumidza kwedhirowa iyi kunokanganisa mashandiro akagadzikana e turbine uye kuchengetedzeka kweyuniti neworkshop. Nokudaro, kumanikidza kwedhirowa yedhirowa kwave kuchinetsa zvakanyanya neindasitiri nevadzidzi.
Sezvo dambudziko re pressure pulsation mu draft tube ye turbine rakatanga kutaurwa muna 1940, chikonzero chacho chave chichinetsa uye chichikurukurwa nenyanzvi dzakawanda. Parizvino, nyanzvi dzinowanzo tenda kuti pressure pulsation ye draft tube pasi pemamiriro emutoro wechikamu inokonzerwa nekufamba kwe spiral vortex mu draft tube; kuvapo kwe vortex kunoita kuti kugoverwa kwe pressure pachikamu che draft tube kusaenzana, uye ne circumference ye vortex belt, asymmetric pressure field iri kutendererawo, zvichiita kuti pressure ichinje nguva nenguva, zvichiita kuti pressure iite pulsation. Helical vortex inokonzerwa nekuyerera kwe swirling pa draft tube inlet pasi pemamiriro emutoro wechikamu (kureva, pane tangential component ye velocity). US Bureau of Reclamation yakaita ongororo ye experimental pa swirl mu draft tube, uye yakaongorora chimiro che vortex nemaitiro pasi pe swirl degrees dzakasiyana. Mhedzisiro yacho inoratidza kuti chete kana swirl degree yasvika padanho rakati, spiral vortex band ichaonekwa mu draft tube. Mhepo inotenderera inoonekwa pasi pemamiriro emutoro wechikamu, saka chete kana mwero wekuyerera (Q/Qd, Qd iri iyo dhizaini yekuyerera kwenzvimbo) yekushanda kweturbine uri pakati pe0.5 ne0.85, kupururudza kwakanyanya kwesimba kuchaonekwa muchubhu yekudhirowa. Kuwanda kwechikamu chikuru chepururudza yekumanikidzwa kunokonzerwa nebhandi revortex kwakaderera, izvo zvakaenzana ne0.2 kusvika 0.4 kanopfuura frequency yekutenderera kwemumhanyi, uye kana Q/Qd iri diki, kupururudza kwekumanikidzwa kwakakwira. Pamusoro pezvo, kana cavitation ikaitika, mabubble emhepo anogadzirwa muvortex anowedzera saizi yevortex uye anoita kuti kupururudza kwekumanikidzwa kuve kwakanyanya, uye kuwanda kwepururudza kwekumanikidzwa kuchachinjawo.
Mumamiriro ezvinhu ekuremerwa zvishoma, kudzvanywa kwesimba muchubhu yedhirowa kunogona kutyisidzira zvikuru mashandiro akasimba uye akachengeteka eyuniti yemagetsi emvura. Kuti vadzivise kudzvanywa uku, mazano akawanda nenzira dzakakurudzirwa, dzakadai sekuisa zvipenga pamadziro echubhu yedhirowa uye kupinza mukati mechubhu yedhirowa matanho maviri anoshanda. Nishi nevamwe vakashandisa nzira dzekuedza nedzenhamba kuti vadzidze mhedzisiro yezvipenga pakuputika kwesimba kwechubhu yedhirowa, kusanganisira mhedzisiro yemhando dzakasiyana dzezvipenga, mhedzisiro yehuwandu hwezvipenga nenzvimbo dzazvo dzekuisa. Mhedzisiro yacho inoratidza kuti kuiswa kwezvipenga kunogona kuderedza zvakanyanya kudzvanywa kwemhepo uye kuderedza kudzvanywa kwesimba. Dmitry nevamwe vakaonawo kuti kuiswa kwezvipenga kunogona kuderedza amplitude yekuputika kwesimba ne30% kusvika 40%. Kufema kubva mugomba repakati remugodhi mukuru kuenda kuchubhu yedhirowa inzira inoshandawo yekudzvinyirira kudzvanywa kwesimba. Dhigirii rekudzvanywa kwesimba. Pamusoro pezvo, Nishi nevamwe. vakaedzawo kufefetedza chubhu inodhonza mweya nepakati pemaburi madiki ari pamusoro pechipete, uye vakaona kuti nzira iyi inogona kudzvinyirira kumanikidzwa kwemhepo uye huwandu hwemhepo hunodiwa hushoma kwazvo kana chipete chisingashande.
Nguva yekutumira: Nyamavhuvhu-09-2022
