Abstract: A new nonlinear method-chaotic analysis was used to analyze the pressure fluctuation in the impinging region of SCISR. The signals of pressure fluctuation were filtered by using the wavelet theory. The chaotic attractors were reconstructed on the basis of the phase space theory.Three characteristic parameters to describe chaos, such as correlation dimension, Kolmogorov entropy and Lyapunov exponent, were calculated. The chaotic profiles were shown in the impinging region of SCISR by studying the value of these three parameters at different rotary speeds and on different positions of area-y.At the same time, the trend of these three parameters changed similarly at different rotary speeds and on different positions.

摘要： 浸没循环撞击流反应器撞击区的压力瞬态信号包含了该区域内流体的许多动态信息，为了分析这些动态信号，采用了一种新的非线性分析方法，即混沌分析.利用小波理论对信号进行过滤，采用重构相空间理论恢复已过滤信号的吸引子.利用数学方法计算刻画混沌吸引子的3个特征参数：关联维、K熵和最大Lyapunov指数.对不同螺旋桨转速及同一y平面上不同测量点位置上算得的特征参数值进行研究，研究结果显示浸没循环撞击流反应器撞击区流体具有混沌特性，而且3个特征参数在不同的螺旋桨转速下及不同的测量点位置具有相同的变化趋势.