Njengomthombo wamandla ahlaziyekayo ophendula ngokukhawuleza, amandla ombane adla ngokudlala indima yolawulo oluphezulu kunye nolawulo lwamaza ombane kwigridi yamandla, nto leyo ethetha ukuba iiyunithi zombane oqhutywa ngamanzi zihlala zifuna ukusebenza phantsi kweemeko eziphambukayo kwiimeko zoyilo. Ngokuhlalutya inani elikhulu ledatha yovavanyo, kucaciswa ukuba xa i-turbine isebenza phantsi kweemeko ezingezizo zoyilo, ngakumbi phantsi kweemeko zomthwalo oyingxenye, i-pulsation enamandla iya kubonakala kwi-tube eyidrafti ye-turbine. Ukuphindaphinda okuphantsi kolu xinzelelo lwe-pulsation kuya kuchaphazela kakubi ukusebenza okuzinzileyo kweinjini yomoya kunye nokhuseleko lweyunithi kunye neworkshop. Ngoko ke, ukunyanzeliswa koxinzelelo lwe-tube eyidrafti kuye kwaxhalabisa ngokubanzi kwishishini kunye ne-academia.
Ekubeni ingxaki yoxinzelelo loxinzelelo kwi-tube eyidrafti ye-turbine yaqala ukucetywa kwi-1940, isizathu siye saxhalabisa kwaye saxoxwa ngabaphengululi abaninzi. Okwangoku, abaphengululi bakholelwa ngokubanzi ukuba ukunyanzeliswa kwetyhubhu yedrafti phantsi kweemeko zomthwalo wenxalenye kubangelwa yi-spiral vortex movement kwi-drafti ye-tube; ubukho be-vortex benza ukusabalalisa uxinzelelo kwinqanaba elinqamlezayo letyhubhu eliyidrafti lingalingani, kwaye kunye nokujikeleza kwebhanti ye-vortex, intsimi yoxinzelelo lwe-asymmetric nayo ijikelezayo, ibangela ukuba uxinzelelo lutshintshe ngamaxesha kunye nexesha, lwenza i-pulsation yoxinzelelo. I-vortex ye-helical ibangelwa ukuhamba okujikelezayo kwi-draft ityhubhu yokungena phantsi kweemeko zomthwalo wenxalenye (oko kukuthi, kukho icandelo le-tangential yesantya). I-Bureau of Reclamation yase-US yenze uphononongo lokulinga kwi-swirl kwidrafti yetyhubhu, kwaye yahlalutya imilo ye-vortex kunye nokuziphatha phantsi kweedigri ezahlukeneyo ze-swirl. Iziphumo zibonisa ukuba kuphela xa idigri ye-swirl ifikelela kwinqanaba elithile, i-spiral vortex band iya kubonakala kwidrafti yetyhubhu. I-vortex ye-helical ibonakala phantsi kweemeko zomthwalo wecala, ngoko ke kuphela xa isilinganiselo sokuhamba kwesihlobo (i-Q / Qd, i-Qd yinqanaba lokuhamba kwendawo yokuyila) yokusebenza kwe-turbine phakathi kwe-0.5 kunye ne-0.85, i-pulsation yoxinzelelo olunzima luya kubonakala kwi-drafti ye-tube. I-frequency yecandelo eliphambili loxinzelelo lwe-pulsation olubangelwa ibhanti le-vortex lincinci, elilingana ne-0.2 ukuya ku-0.4 amaxesha okujikeleza okujikelezayo komgijimi, kunye ne-Q / Qd encinci, iphakamileyo yoxinzelelo lwe-pulsation frequency. Ukongezelela, xa i-cavitation isenzeka, iibhubhu zomoya eziveliswa kwi-vortex ziya kwandisa ubukhulu be-vortex kwaye zenze i-pressure pulsation ibe nzima ngakumbi, kwaye i-frequency ye-pressure pulsation iya kutshintsha.
Ngaphantsi kweemeko zomthwalo wecala, ukunyanzeliswa koxinzelelo kwi-tube eyidrafti kunokubeka ingozi enkulu ekusebenzeni okuzinzile kunye nokukhuselekileyo kweyunithi yombane wamanzi. Ukuze ucinezele le pulsation yoxinzelelo, iingcamango ezininzi kunye neendlela ziye zacetywayo, ezifana nokufaka amaphiko eludongeni lombhobho oyidrafti kunye nokungena kwi-tube eyidrafti yimilinganiselo emibini esebenzayo. UNishi et al. wasebenzisa iindlela zovavanyo kunye namanani ukufunda isiphumo samaphiko kwi-pulsation yoxinzelelo lwetyhubhu eyidrafti, kubandakanywa nemiphumo yeentlobo ezahlukeneyo zamaphiko, imiphumo yenani lamaphiko kunye nezikhundla zabo zofakelo. Iziphumo zibonisa ukuba ukufakwa kwee-fins kunokunciphisa kakhulu i-eccentricity ye-vortex kunye nokunciphisa i-pulsation yoxinzelelo. UDmitry et al uphinde wafumanisa ukuba ukufakwa kweefins kunokunciphisa i-amplitude yoxinzelelo lwe-pulsation nge-30% ukuya kwi-40%. Ukungenisa umoya ukusuka kumngxuma ophakathi we-shaft ephambili kwi-tube eyidrafti nayo yindlela esebenzayo yokucinezela i-pulsation yoxinzelelo. Iqondo le-eccentricity ye-vortex. Ukongeza, uNishi et al. Kwakhona wazama ukukhupha ityhubhu eyidrafti ngokusebenzisa imingxunya emincinci kumphezulu we-fin, kwaye wafumanisa ukuba le ndlela inokucinezela i-pulsation yoxinzelelo kunye nomthamo womoya ofunekayo uncinci kakhulu xa i-fin ayikwazi ukusebenza.
Ixesha lokuposa: Aug-09-2022
