THÔNG TIN TÀI LIỆU
SCIENCETECHNOLOGYl UfNG DUNG CFD TRONG KHI DONG LI/C HOC DE XAC Om LI/C CAN KHONG KHI VA LI/C NANG CUA XE DU LKH TAI TRONG NHE APPLICATIONS OF CFD IN AERODYNAMICTO DETERMINE AIR DRAG AND LIFT OF LIGHT CARS Le Hong Quan, Nguyen Anh Ngoc CACOjNH NGHIA VA CHU THICH Tdm t i t CFD Bai bao Sli'dung cac cdsdiy thuyet cda khi'dong life hoc nham du'a nhung de xuat tot nhat ve hinh dang lire hoc chat ldng thong qua phan mem Ansys Fluent 14.0 flieu vo ciing hQu ich tmng cac nghien ciiti Aerodynamics ICEM Integrated Computer-aided v^ sau v6i muc dich la gi^m thieu luc can chuyen dgng cung nhif luc nang mot so dieu kien ve dudng x^ hay ngifcii 1^1 Ba mo hinh tiian xe don gian vdi tam chan trudc, sau va khong cd tam chan duoc thiet kl'v^ duoc dat ben ong dong phu hcTp de phan tich nhifng anh hucmg cua lu'c can khong kht t^c dong tdi xe tSI nhe tmng cac trudng hop chuyen dpng khac Cie ke't qui du'Oc dinh gia mot each ky luflng nham de nhifng hudng nghien cilu xa han lien quan tdi cac van de cap thiet hi§n nhif ti^t kiem nang luong, can bang than xe, dieu khien trtrgt banh, an toan Tirkh6a: Khi dong lu'c hocxe hoi, ANSVSICEM CFD, xe tai nhe, he so can khong khiva luc nang Abstract This paper utilizes aerodynamic theory to indicate the best shape of car's body in drag force and lift force coefficients relying on simulation of computational fluid dynamics (CFD) by Ansys Fluent 14.0 That is very meaningful in the future studies which purposes are deceasing in drag force and increasing in lift force in vary conditions of ether ground environment or driver Three simple models with front paneL rear panel and v^ithout panel were created and put inside the appmpriated air tunnel to analyze the affects of air force into light car's body in moving conditions Computational Fluid Dynamics ECUoA Elearonic Control Unit of khidgng hoc ci^a xe tac dgng tdi h§ sd luc c^n va luc nang than xe nhcf vao iing dung may tinh trang dong Engmeenng and Manufacturing R&D Research and Develop A , A Dien tich can chinh dien [m^] Cj Hesoc^nkhongkhi [-1 Cj Hesdiucnang [-1 Fj^^_^^ Luc keo cua xe [Nl f^ LUc nang ddng m Fjj Luc can khf dong INI f Hesd can lan l-l g Gia toe trang trudng [m/s'l m Khdi luong xe [Kg] U,^ Vantocti/Ongddi [m/s] U,V Van tdc khdng [m/s] Gdc doc mat dudng [radl p Mat dd khdng [kg/m' Results are evaluated carefully to expose new further research trends that relate on the saving energy, vehicle stability, friction contml, car safety and etc ien k h u n g v o x e k h i c h u y e n d o n g , d a c Keywords: Vehicleaerodynamic, ANSYS ICEM CFD, light car, drag and lift coefficient b i e t d o i v d l nhCtng x e c o t a i t r p n g n h e , TS Li Hong QuSn, ThS IfguySn Anh Ngoc Khoa CAng ngh^ to, Tnidngfiaihoc Cong nghiep Ha Noi Emaltquan vsae@haiii edu.vn Ngay nhan bai: 14/6/2014 Ngaydiap nhan dang: 20/8/2014 chiing tac dong trUc tiep den he thong phanh, lai, treo va he thong truyen luc cua xe Do do, vdi nhQng hinh dang dong hoc khac cua vo xe se dem Gidl THI$U CHUNG Tinh chat dong luc hoc phu thupc rat Trong vai chuc nam gan day nhieu vao hinh dang cua than xe, nhan lai nhQng ket qua khac nhau, dieu dd to chiu anh hudng chinh cua dong vd cung hQu ich cho cac nha nghien nginh cong nghiep to phat tnen manh me, dpng life hpc than xe da khong bao quanh gay luc can cQu va phat tnen (R&D) khdng nhQng duoc nghien cCtu va phat trien nhSm chuyen dong cung nhu lu'c nang va mo nghien cQu ma ca sin xuat muc dich nang cao tmh chat dong lac men quay xe quanh true t h i n g difng nhSm dat dJoc nhdng tifu dot hpc cua cac loai xe chay tren mat dat Do la nhQng I Uc rat quan tac dpng pha Unh vQc xe hoi So - Tap dii KHOA HOC & CONG NGH£ BBHEOIEacoNG NGtC Ngay nay, yeu cau cua khach hang cang cao ddi hdi cac nha san xuat xe hcJi va cac nha nghien cdu phai no luc rat nhieu de thda man nhdng yeu cau cua khach hang nhU: an toan hon, tien nghi hon, de dang dieu khien, tieu hao nhien lieu it Ben canh do, gia cua cac loai nhien lieu hda thach tang nhanh khan hiem va khdng the tai che yeu cau phai tiet kiem nang laong hoac tim kiem ngudn nhien lieu thay the phu hop vdi cac loai ddng ccj hien Van de giam daocluc can ddng hpc nhSm thap mQc tieu hao nhien lieu hay giam lac nang dpng lac hpc nham nang cao tai bam cua banh xe vdi mat dadng giup cho xe chuyen ddng an toan la nhQng y tudng tdt Thdng thudng, md hinh xe taong duong se dapc thiet ke va dat vao ben mdi tradng gia lap (mdt ong ao vdl khdng chuyen dong ben trong) va daoc mo phdng bang may tinh Cac ket qua se daoc phan tich trade thiet lap mdt he thdng thQ nghiem thUc te phong thf nghiem vdi cac cam bien va cac trang thiet bl de dac cac thdng sd can thiet Cudi cung, de an tot nhat vdi cac ket qua kha thi nhat se daoc laa chpn de tiep tuc nghien cdu va phat tnen 1.1 He so can khong va he so luc nang Lac keo cua xe giup xe chuyen ddng tren dadng phy thuoc vao lac can khdng khi, \iic can quan tfnh, luc can lan va lac can ddc theo cdng thdc sau[l]: F dnver nU C A 2^ ' D P +m—+ ^t + mgfcos a+mgsina Oe gtam mQc tieu hao nhien lieu, mdt cac yeu td d ve phai cua phaong trinh tren phai dat cac tieu nhang ba sd chung lai chda khdi laong m cua xe, yeu td cdn lai chQa kich thadc, hinh dang va van tdc cho nen chung ta cd the tac ddng vao dd mdt each de dang de lam giam C^ Hinhl Canhkhiddng Vao nhQng nam 1920, he so can khdng khitrung binh cua xe du hch vao khoang 0,7 Ngay nay, he so dQOc giam xudng thap hon 0,3 [2] He sd iQc nang C|^ cd the dapc tfnh toan theo cdng thQc sau [3]: • Scaled residuals: 10"^ -1726831 phan tif va 307788 nut • Actual car and CAD design (for CFD analysis) size ratio:1:1 THIET KE M HJNH WlO PH6NG Md hinh xe dOn gian dQOc tao ta sau cac dadng bao 2D cCia than xe daoc hoan nhd vao geometry subsystem Fluid Flow system v6i chieu cao 1,42 m va chieu dai 5,10 m (hinh 2) C -pV'A Vdi nhQng xe chd khach hang nhe, C|^ thQdng nam khoang t d 0,106 den 0,143 [4] NhQng mpt so loai xe dac biet nhuxe dua, he so cd the xudng t d - l ,602 tdi -0,048 [3] Oe dupc chinh xac he sd can khdng khf va he sd lUc nang cua xe t
Ngày đăng: 29/11/2022, 10:45
Xem thêm: