Abstract
The velocity signal of the flow field in Impinging Stream Mixer (ISM) was measured with Laser Doppler Anemometer. A de-noising method for velocity signal in ISM based on wavelet threshold was used. It is obtained that the attractor of the system possess infinite self-similar nested structure by comparing the strange attractor before and after de-noising, which is based on phase space reconstruction theory. It is shown that K entropy and the largest Lypunov exponents have the similar tendency in spatial distribution through scientific computation, however, the stratification of K entropy is more obvious. The value of K entropy and the largest Lypunov exponents are both positive, proving that the system is chaotic. The results indicate that K entropy and Lyapunov exponents can be increased by improving the rotating speed, the disorder and unpredictability of chaos system will increase homogeneously, so as to promote the micro-mixing and improve work efficiency
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