摘要
为了深入了解反应器中压力波动的频率特性及产生原因,基于小波变换方法对浸没撞击流反应器中测得的压力波动信号进行分析·从不同尺度上提取信号并计算波动能量,并对压力波动信号在频域上的分布进行分析·确认波动能量主要集中在1kHz之下的范围内,对能量空间分布的分析证明了波动强烈区域是关于轴及关于撞击面对称的·根据强烈波动空间位置的不同将波动频率划分为三个范围,并分析了各范围波动产生的原因·随螺旋桨转数的增加,各尺度的波动能量总体增强,频率分布有一定的变化·对强度的体积积分结果显示主流体旋涡产生的波动能量占主要部分·
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 caustion 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.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第11期1259-1262,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(20176043).
关键词
小波变换
压力波动
撞击流
反应器
频率范围
波动能量
wavelets transform
pressure fluctuation
impinging stream
SCISR
frequency range
fluctuation energy
