Journal of Northeastern University ›› 2006, Vol. 27 ›› Issue (11): 1259-1262.DOI: -

• OriginalPaper • Previous Articles     Next Articles

Analysis of pressure fluctuation signal in submerged circulative impinging stream reactor with wavelets transform

Sun, Huai-Yu (1); Xu, Cheng-Hai (1); Wu, Yuan (2)   

  1. (1) School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China; (2) School of Chemical and Pharmacy Engineering, Wuhan Institute of Technology, Wuhan 430037, China
  • Received:2013-06-23 Revised:2013-06-23 Online:2006-11-15 Published:2013-06-23
  • Contact: Sun, H.-Y.
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Abstract: To reveal the frequency character of pressure fluctuation in reactor and what causes it, the wavelet transform is used to analyze the pressure fluctuation signals tested in Submerged Circulative Impinging Stream Reactor (SCISR), where the signals are extracted on different scales to calculate fluctuation energy and the distribution of pressure fluctuation in frequency domain is discussed. The results show that the fluctuation energy concentrates mainly in range below 1 kHz. The energy distribution in space shows that the strong pressure fluctuation region is symmetrical about the impinging plane and approximately symmetrical about the axis. The fluctuation frequency is thus divided into three ranges according to different spatial locations, and the causation of each and every range is analyzed. In response to the change in propeller revolution, the fluctuation energy on every scale increases simultaneously with some changes found in frequency distribution. The volume integral for total fluctuation intensity shows that the fluctuation energy arising from the vortex of major fluid in SCISR is predominant.

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