摘要
针对均匀流场中,三维等高型陷落腔因分离流而产生的流激振荡问题,开展了系列的实验研究.实验过程中,主要考虑来流攻角为0时,流速变化（Re=2.06×10^5-1.16×10^6）对三维陷落腔流激振荡特性的影响.同时,分别测量了三维腔体侧壁周向及垂向流体压力,分析了腔体内稳态压力和脉动压力的周口、垂向分布规律及腔口剪切层自持振荡特性.实验结果表明：均匀流场中三维陷落腔内部压力分布复杂,且当雷诺数大于某值时腔体内稳态压力全都呈现出负压,同时腔口随边处存在着较大的脉动压力,且脉动压力随相对高度增加而减小,但腔口导边及侧面处的脉动压力随相对高度增加而增大.剪切层自持振荡频率的无量纲数St数随Re变化为一常数值,但其值略大于气流场中二维陷落腔的St数.
To better understand how fluid oscillations induced by the separation of uniform flows can result in 3D cave-in cavities, a series of physical experiments were carried out. When the angle of attack was 0, the influence of flow rate change （Re = 2.06 × 10^5 - 1.16 × 10^6 ） on the characteristics of fluid induced oscillation was experimentally determined. Circumferential and vertical fluid pressures along the open cavities were measured. At the same time, the distribution of steady pressure, fluctuating pressure and the characteristics of self sustained oscillations in the shear layer were analyzed. The experimental results showed that the distribution of pressure from open cavities in uniform shear layers is complex. When the number became larger than the critical value, the steady pressure coefficient of the cave-in cavity became negative. Fluctuations in pressure at the trailing edge rose to their peak. This reduced as the relative height increased, but fluctuations in pressure at the leading and side walls increased as relatire height increased. Changes in the dimensionless number of the shear layer relative to the number were constant, but the value of the number was a little larger than that of the two dimensional cave-in cavity in the air.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2010年第6期693-700,共8页
Journal of Harbin Engineering University
基金
国防科学技术工业委员会基础研究基金资助项目(B1920070100)
关键词
三维陷落腔
均匀流
流激振荡
实验研究
cave-in cavity
uniform flow
fluid induced oscillation
experimental research
