CAJ | 학술논문

为得到高雷诺数（1×105～1×106）条件下顶盖驱动方腔水流流场和速度分布，设计了边长为0?2 m和0?5 m的立方腔，并利用粒子图像测速技术（ Particle Image Velocimetry， PIV）对方腔流流场进行测量，分析方腔流流场特性和边壁对流场影响规律。结果表明：雷诺数达到5×105时方腔流中主涡旋发生变形，雷诺数从5×105增大到1×106过程中，中间的初级涡旋（ Primary eddy， PE）继续变形，并分裂成两个涡旋；随着雷诺数的增大，顺流次级涡旋（Downstream Secondary Eddy Region， DSE）区域面积缩小，雷诺数为5×105时DSE区域可看到成型的涡旋，当雷诺数为1×106时， DSE区域继续缩小，在同样条件下看不到成型的涡旋；雷诺数增大的过程中各边壁的边界层变薄，边壁对方腔流流场特性影响明显。
위득도고뢰낙수（1×105～1×106）조건하정개구동방강수류류장화속도분포，설계료변장위0?2 m화0?5 m적립방강，병이용입자도상측속기술（ Particle Image Velocimetry， PIV）대방강류류장진행측량，분석방강류류장특성화변벽대류장영향규률。결과표명：뢰낙수체도5×105시방강류중주와선발생변형，뢰낙수종5×105증대도1×106과정중，중간적초급와선（ Primary eddy， PE）계속변형，병분렬성량개와선；수착뢰낙수적증대，순류차급와선（Downstream Secondary Eddy Region， DSE）구역면적축소，뢰낙수위5×105시DSE구역가간도성형적와선，당뢰낙수위1×106시， DSE구역계속축소，재동양조건하간불도성형적와선；뢰낙수증대적과정중각변벽적변계층변박，변벽대방강류류장특성영향명현。
Laboratory experiments have been conducted to study high Reynolds number ( from 1 × 105 to 1 × 106 ) , three?dimensional lid?driven cavity flows in two cavity dimensions:0?2m×0?2m×0?2m and 0?5m×0?5m×0?5m. Par?ticle Image Velocimetry ( PIV) technical was applied to investigate the flow field and the effects of wall on the flow fields. Measured time?averaged streamlines show that the primary eddy starts to distort at Re=5 × 105 and starts to breakup into two/three eddies at Re=1×106. The region of Downstream Secondary Eddy (DSE) decreases as the Reynolds number increases. At Re=5×105, a fully developed DSE can be seen clearly. But it is hard to see when Re=1×106. The thickness of boundary layer becomes thinner and thinner as the Reynolds number increases. The measure?ments also show that the side boundary has a significant impact of the primary eddy.