撞击流反应器压力波动信号的Hilbert-Huang变换分析

将Hilbert-Huang变换(HHT)应用于撞击流反应器压力波动信号分析,并提取出浸没循环撞击流 反应器压力波动信号的各阶内禀模态函数(IMF),证实了压力波动信号的非线性、非平稳特性。分析压力波动信号 各阶内禀模态函数的能量分布以及高、中、低频段能量分布与转换,发现不同频段IMF的能量分布与流型转变之间 的对应关系。结果表明,随着螺旋桨转速的增加,在粒子相互撞击的过程中,产生不同程度涡运动,使得各阶IMF分 量的能量分布也随之变化。新的Hilbert-Huang变换分析方法直接揭示了撞击流反应器内压力波动信号经EMD 分解所得的IMF分量的能量分布与流体流型转变之间的内在规律,同时也提供了一个有力的定量依据。

Hilbert-Huang Transform of Pressure Fluctuation Signal in SCISR

The Hilbert-Huang transform(HHT)was applied to analyze the pressure fluctuation signal in submerged circulative impinging stream reactor.The intrinsic mode function(IMF) was extracted from the pressure fluctuation in submerged circulative impinging stream reactor(SCISR).The non-linear and non-stationary characteristics of the pressure fluctuation signals were demonstrated.Analyzing the energy distribution of high,middle,low frequency segment and its transfer within different IMF,the relationship between the flow regimes identification in SCISR and the energy distribution of the different frequency segment IMF were founded.The results show that the rotate speed gradually rose,the impinging course of particles would caused the vortex with different scales and energy distribution of IMF would caused diversification.Hilbert-Huang transform method exposes internality rule between flow pattern and energy distributing of IMF component that is obtained by decomposing pressure fluctuation signal of SCISR using EMD.At the same time,quantificational proof can be provided.