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I KHOA HOC VA ^ Danh gia ket qua nghien ciru thirc nghiem xac djnh duang kinh D^ toi iru tren banh cong tac tua bin tia nghieng » PHUNG HONG TUAN, NGUYEN VU VIET Vien Thuy dien va Nang \\Jar\g tai tao TOM TAT Duong kinh vao toi vm (Dio) cua banh cong tac (BCT) tuabin tia nghieng (TBTN) dugc xac dinh qua tinh toan ly thuyet va nghien cuu thuc nghiem Gia tri Dio dugc nghien cuu xac dinh chinh xac se khong nhung tang dugc hieu suat lam viec cua tua bin ma nang cao cong suat, giam gia ciia to may thiiy dien I Dat uan de Tren the gidi, d cac nude Tay Au (Anh, Due), da quan tam nghien ciiu va dua vao su dung TBTN tii d i u t h i ky 20 cho eae to may thiiy dien vira va nhd (eong suat den lOMW/td may) Thuc te, mau TBTN ciia mgt sd hang da kha hoan thien Nhung, eho den nay, hau nhu khong ed eong trinh nghien eiiu nao duge cong bo O nude ta, viec nghien ciiu iing dung TBTN vao thuy dien nho mdi dugc tien hanh Idioang 10 nam trd lai day tai Vien Thuy dien va nang lugng tai tao Thuc te su dung eho thay, chiing rat phii hap vdi cac td may thiiy dien nho vtM cot ap tir 15-150m Dac biet, vtii ket cau true diing mgt hoac hai voi phun rat thich hgp vcri cae to may thiiy dien sieu nhd (200W d i n 5.000W) Uu digm ndi bat ciia tua bin la dae tinh hieu suat kha phang, ket cau dtm gian, nhd ggn, de lap dat, van hanh, bao duong va siia chira Do it tai lieu tham khao, thieu kinh nghiem thiet ke nen qua trinh iing d u n g da phat sinh mgt so van de bat cap: edng suat thuc te khong dam bao so vdi tinh toan, xay hien tucmg chen dong phia sat bau eanh, d md Icrn cua vdi phun (luu lutmg Icm) cting suat khdng tang Hinh la anh chup BCT eiia TBTN Vien thuy dien va nang lutpng tai tao che tao va lap dat tai nha may thuy dien Sudi Tan vdi cong suat 500kW sau mgt thdi gian van hanh (klioang thang) Vet sang d lung canh phia sat bau la su chen ddng va va dap d loi ciia canh gay nen 36 C6NGNGHIEP»Ky I thing 5/201U Hinh 1: Hien tugng chen ddng phfa sat bau BCT Ddng thiM, tai phong thi nghiem, cung quan sat dugc hien tucmg ddng khoi canh BCT tap trung rat nhieu d phia bau canh nghien ciiu tua bin md hinh Van de dat la can phai nghien ciiu de xac dinh vi tri toi uu eua ddng tia tac dcmg len BCT de khac phuc eae van de bat cap tren Ly thuyet va phuang phap nghien eiiu thue nghiem xae dinh Dl tdi uu da dugc trinh bay d tai lieu [1] Trong khuon khti bai bao nay, chi trinh bay ehi tiet cae ket qua thuc nghiem, cac phan tich danh gia ket qua rut cac ket luan II Ket qua nghien ciru thirc nghiem Xuit phat tii tua bin mau thiet k l (tham khao ciia Website: www.tapchicongnghiep.vn Nha may Thiiy dien Na Cha - Mdc Chau - Son La hang GILKES - Anh c h l tao) Tiln hanh thue nghiem vdi cac gia tri dudng kinh Dl=250mm (theo m a u thilt kg) d i n gia tri D l = 280mm, mdi budc thay ddi dudng kinh D l la 5mm Tai mdi gia tri ciia D l , t i l n hanh dac va lay sd lieu d cac m d Idn ciia vdi p h u n (S=30mm; S=40mm; S=50mm) O mdi md, thay doi tdc tua bin tii 300v/ph den 600v/ph vdi budc thay ddi h i 10 d i n 20v/ph, thu thap dugc mdt bd dii lieu Sau xii Iy dii lieu, t i l n h a n h xay d u n g cac dudng quan he giiia hieu sua't va sd vdng quay tua bin (hi hinh d i n hinh 4) Hieu suat Ion nhat- D1 - S=30mm - S=40mm - S=50mm S=30nim Poly (D1=250) PoV (D1=255) - - - Poly (D1=260) — Poly (D1=270) Poly (01=280) • Poly (01=265) 260 Poly (01=275) i 0.77 j 0.76 0.75 "y^ ; 0.72 M 0.71 J^ M.A 0,69 0.630.67 - 0.65 ! f 3C0 270 /y rf Hinh 4: Bieu cac quan he giUa hieu suit tua bin sd vdng quay vdi cac gia tri D^ d md S=50rrun Kgt qua nghign eiiu thuc nghiem xac dinh vi tri vao tdi uu cua tam true ddng tia trgn BCT ciia TBTN md hinh dugc trinh bay mdt each tdng quat tren bieu hinh ""4A ^\ i A •''/ ' ./ •// i /J // ' 0.73 0.66 ^ _L,^^ ' y'^''"" ^ '""^^N* i // > ' • ll ^',±,^.1 • > X 0.74 07 265 Duong l >Ky I, thang 5/2010 Website: www.taochiconanahjAn > '
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