圆Couette流混沌现象的实验研究

本文用流动显示和激光散射功率谱观泌了圆Couette流中的混沌现象,发现有两条导致弱湍流激发的道路:一条是从准周期运动到混沌,另一条是阵发混沌,对于这两条道路在诸转变阈值上的巨大差别,作者用弱非线性作用局域有效的新观点给出物理解释。

EXPERIMENTAL STUDY OF CHAOTIC PHENOMENA IN A CIRCULAR COUETTE FLOW SYSTEM

In this paper, we observed and measured the chaotic phenomena in a circular Couette flow system by means of flow visualizations arid Laser light scattered power spectra.Two routes to turbulence have been found: the first one viafrom quasiperiodic motion to chaos, the second one via intermittency.A new idea that the weak nonlinear,interaction may locally have an effect on Taylor vortices is introduced in explanation of the great difference in transition threshold values between the Above two routes.