Tuyin tap Cdng trinh Hdi nghi Khoa hpc Cahpc Thiiy Todn qudc, Phan Thiet, 2008 269 I \ Co' so lu-a chon va tinh toan thiet ke mo hinh tua bin hu-dng cheo cong suat vira va nho Le Danh Lien', Pham Phiic Yen^ Tn rang DHBK Hd ndi, Vien Khoa hoc Thiiy lai Quoc gia Tdm tdt: Tua bin thiiy luc hudng cheo Id logl chuyen tiip giiia tua bin tdm true vd hirimg true Logl thiet bi ndy d nude chua che tgo vd hdu nhu chua dugc su dung Nd cd nhieu uu diem nhirng cimg cd nhieu dgc thii cdn nghien cuu vd cai tien cho phii hgp viri dieu kien irng dimg cho cdc tram thiiy dien vira vd nhd Trong bdi ndy giai thieu ca sd lira chgn vd tinh todn thiet ke md hinh tua bin hudng cheo de xdy dung dugc mgt md hinh thiet bi phu hirp cho dieu kien ung dung cu the d nirdc ta Abstract: A diagonal turbine is laying same where In benveen a Centrofugal and an axial turbines This type of turbine has not been fabricated and used In VIelnam sofar Diagonal turbine has many advantages but it's selection and design must be followed a special way to make it usable more efficiently This paper describes criteria for selection and design if the turbine model, such that the design condition wis close to the real application in our coiintiy \ Co" sd lu-a chon mo hinh tua bin hu-ffng cheo cong suat vua va nho Tua bin hudng cheo Id loai chuyen tiep giira tua bin tam true vd hudng trye Nd dugc sir dyng cho pham vi cot nude tir 25 den 200m, Trong pham vi cot nude nhu vay neu diing tua bin hudng cheo ta se cd lai ve mat hieu sudt, Tua bin hudng cheo cd the sir dyng thay the tua bin hudng trye cdt nude thdp vd thay the cho tua bin lam trye cot nude cao Tuy nhien tua bin hudng chc^o cd cdc ddc thu rieng ve mat ket cdu nen viec che tao ddi hdi chinh xdc rdt cao Tua bin hucrng cheo thudng dugc che tao dang cdnh xoay vd bd tri dimg Do kit cau nhu vay nen de tua bin lam viec binh thudng ddi hoi phai khdng che kich thudc dgc trye mgt each rat nghiem ngat Trong dilu kien cdng nghe chi tao d nude ta, de cd the su dung rgng tai dang tua bin hudng cheo cho cac tram thuy dien cdng suat vira vd nhd cdn cd cac cai tien ve mat ket cau de tao cac tua bin hudng cheo vdn dam bdo bieu sudt cao nhung che tao de dang ban, kinh te ban Tua bin hudng cheo cdng sudt Idn trude day theo truyin thdng dugc che tao dudi d^ng cdnh xoay Do vay bl mat bdu cdnh va budng bdnh cdng tdc phdi che tao dudi dang hinh cdu, cdnh cdng tdc khong cd dTa ngodi Viec chi tao bdnh cdng tdc nhu vay rdt phiic tap, ddi hdi chinh xac chi tao rat cao Bk khdc phuc cac khd khdn dd chung tdi dy kien dua vao cac: cai tiln dl tao loai bdnh cdng tdc mdi ung dung cho loai tua bin hirdng cheo cdng suat vira va nhd Doi vdi eac tua bin hudng cheo cdng sudt vira vd nhd, vdn de dieu chinh cdng suat qua trinh lam viec bdng each xoay canh dl bd tri cdnh dudi cdc gdc ddt cdnh khac Ca sd lua chon vd tinh todn thiet ke md hinh tua bin huang cheo cdns sudt vira vd nhd 270 khong trd nen cdp thilt, vi rang tin hao cdng suat tuang ddi cd the Idn nhung ton that cong sudt thyc tl se khong qua Idn co the cho phep dugc Vi vay ddi vdi cdc tua bin hudng cheo cdng suat vua va nhd cd the sir dung banh cdng tac hudng cheo canh cl dinh Trong trudng hgp banh cdng tac cd the gan them vanh ngoai vdi cdc Id canh d tilt dien bien, Nhd vay cd the lam kin bdnh cdng tdc de dang ban va tin cdy han Bdnh cdng tac cung se cd ben cao ban Lu-a chon mo hinh tuabin huong cheo de tin toan thiet ke va nghien cu-u thu nghiem Thyc nghicm cho thdy hinh dang phdn dan ddng cua tua bin hudng chc^o cd dnh hudng dang kl tdi ty tdc, ddc tinh nang lugng va dac tinh xdm thuc cua tua bin Phu thudc vao pham vi cot dp lam viec, tua bin hudng cheo duac phdn cdc loai (theo phan loai ciia Nga [3]): - Tua bin cot dp thap: m^60, = 60°, H = 25 ^ 60m; - Tua bin cot dp trung binh: ;inil45, = 45'\ H = 60 ^ 120m, vd - Tua bin cot dp cao: ^0/130, = 30" H = 120 ^ 200m Cdc thdng sd ddc trung cua phdn dan ddng cua tua bin hudng cheo la: goc nghieng cua cdc cdnh ddn cua bdnh cdng tdc ddi vdi true tua bin; ty sd bdu di/Di; chieu cao tuang doi cua cdnh hudng ddng bg/Di; Dudng kinh trung binh tuong ddi D,b/D| bd tri mep vdo va chieu rgng cdnh dan, dudng kinh cd tua bin va ban kinh lugn cua nd (hinh I) Uo'U7527i )iem giua c canh huc)ii!^' nOJD, § d/j ^0.65d,