循环射流混合槽内压力脉动时间序列多尺度分析  

Multi-scale Analysis of Pressure Fluctuation Time Series in the Circulating Jet Tank

作　　者：禹言芳[1,2] 赵耀[1,2] 孟辉波[1,2] 吴剑华[1,2] YU Yanfang ZHAO Yao MENG Huibo WU Jianhua(School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142 Liaoning Key Laboratory of Chemical Technology for Efficient Mixing, Shenyang University of Chemical Technology, Shenyang 110142)

机构地区：[1]沈阳化工大学能源与动力工程学院,沈阳110142 [2]沈阳化工大学辽宁省高效化工混合技术重点实验室,沈阳110142

出　　处：《机械工程学报》2016年第18期168-176,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(21476142;21106086;21306115);辽宁省高等学校优秀人才计划(LR2015051;LJQ2012035);辽宁省博士科研启动基金(20131090);辽宁省教育厅科研项目计划(L2013164)资助项目

摘　　要：为探讨循环射流混合槽（Circulating jet tank,CJT）内瞬态压力脉动的复杂性特性,采用动态数据采集系统对射流混合区内不同轴向、径向和周向位置的压力脉动信号（Pressure fluctuation signal,PFS）进行测量。根据PFS的标准差、峰度和偏度分布,优化PFS序列最佳样本数i=110 000。基于有限统计复杂性,比较综合法、动态法和静态法等三种时间序列符号化方法,得出综合法比动态法和静态法的适应性强,并确定最佳小波分解尺度。对CJT内各尺度的PFS进行有限统计复杂性和复杂度分析,发现CJT内PFS的两种复杂性分布趋势相似。通过对PFS多尺度分析发现：随着分解尺度的增加,复杂度先急剧衰减后趋于平稳,表明CJT内PFS随机性减弱周期性增强;PFS分解得到0～0.98 Hz低频A10尺度概貌信号的复杂度趋于0,揭示CJT内动力系统为整体稳定、局部不稳定的多尺度结构。In order to investigate the complexity characteristics in the jet mixing zones of the circulating jet tank （CJT）, a dynamic data acquisition system is employed to measure the instantaneous Pressure fluctuation signals （PFS） at different axial, radial and circumferential positions. The optimal data lengthi=110 000 is extracted based on the distributions of standard deviation （σ）, the kurtosis （K）, and the skewness （S） of the PFS. Based on the finite statistical complexity, the comparison among the synthetic method, dynamic method, and static method shows that the synthetic method behaves the highest adaptability. The most optimal wavelet decomposed scale is obtained. The complexity of PFS in the CJT is analyzed at different scales based on the finite statistical complexity and complexity. The results show that distribution trends of two kinds of complexity of PFS in the CJT are similar. Based on the multi-scale analysis of PFS, the values of complexity measure sharply decay then slightly decrease with the increasing decomposed scales, which indicate that the flow stability become stronger. The complexity measure of approximation PFS at scale J=10 with the frequency band of 0~0.98 Hz approaches to zero, which shows that the flow in the CJT appears periodic flow. There are multi scale flow structures which compose global stabilization and local instability in the CJT.

关 键 词：循环射流混合槽 压力波动 多尺度 有限统计复杂性 

分 类 号：TQ051[化学工程]