CAJ | 학술논문

采用有限体积方法，对攻角为45°正方形排列的4个等直径圆柱的二维绕流进行了数值模拟。得出了Re＝100以及不同间距比下的涡量场分布和四圆柱升/阻力系数以及St数等空气动力参数的变化规律。结果表明：在绕流过程中，圆柱2受到的干扰力很大，可能会导致严重的震动。当L/D 在4～5之间变化时，升力系数、阻力系数、CD￠、CL￠和 St数都会发生较大的变化，说明此处存在流型的转变。
채용유한체적방법，대공각위45°정방형배렬적4개등직경원주적이유요류진행료수치모의。득출료Re＝100이급불동간거비하적와량장분포화사원주승/조력계수이급St수등공기동력삼수적변화규률。결과표명：재요류과정중，원주2수도적간우력흔대，가능회도치엄중적진동。당L/D 재4～5지간변화시，승력계수、조력계수、CD￠、CL￠화 St수도회발생교대적변화，설명차처존재류형적전변。
A two-dimensional finite volume method is used to perform a numerical simulation of cross-flow around four equal diameter cylinders in a square configuration at α=45℃. The vorticity field distribution and the variation law of aerodynamic parameters,such as mean drag and lift coefficients and Strouhal number,etc. of four cylinders in various spacing ratios at Re=100 are achieved. The results show that the disturbing force acting on the downstream cylinder 2 is great and could lead to serious vibration on cylinder 2 in the process of the cross-flow. When L/D varies from 4 to 5,some primary parameters,such as C L ,C D ,CD￠ ,CL￠ and St have noticeable changes,which indicates that the transformation of flow patterns exists here.