绕水翼空化的发展及其涡量场特性分析.pdf

28 3 Vol. 28 No. 3 2008 3 Transactions of B ijing Institut of T chnology Mar. 2008 李向宾, 刘淑艳, 王国玉, 张博, 张敏弟 ( , 100081 ) : , ( D PI V) , , . : . , , ; , , , ; , , . : ; (D PI V) ; ; : T V13132 : A :(2008 ) Vorticity Characteristics in Cavitating Flows Around a Hydrofoil LI Xiangbin, LIU Shuy an, WANG Guoyu, ZHANG Bo, ZHANG M indi ( School of M chanical and V hicular Engin ring, B ijing Institut of T chnology, B ijing 100081 , China) Abstract: To indicat th charact ristics of vorticity distribution in a cavitating flow fi ld, cavitating flow s around a hy dronautics foil ar m asur d by m ans of a digital particl imag v locim try ( DPIV) syst m and a highsp d vid o cam ra. Th r sults show d that chang s of vorticity distributions in th flow ing fi lds d p nd on th d v lopm nt of cavitation structur s. Most vortic s can b s n n ar th sh arlay r ar a in all cas s, and b hav as vorticity bands. With d cr as of cavitation numb rs, th vorticity valu low rs sinc th r is no larg grad in its v locity in th cavitation ar a, and th inc ptiv position of th low r vort x band mov s dow nstr am. At th cloudcavitation stag , th vorticity bands b com mor disp rs d and b hav as many vorticity group. Key words: hydrofoil; digital particl imag v locim try ( DPIV ) ; cavitating flow s; vorticity distribution , , [ 4] . , L abe te aux [ 1]