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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Experimental study on instantaneous pressure fluctuation time series in the novel tank agitated by multiple horizontal jets
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Experimental study on instantaneous pressure fluctuation time series in the novel tank agitated by multiple horizontal jets

机译：试验研究瞬时压力小说中波动时间序列由多个水平喷射搅拌

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摘要

The Novel Circulating Jet Tank (CJT) agitated by multiple horizontal jets has become an alternative to the bottom-entering mechanical stirred tank in chemical process industries. In order to characterize the coupled interaction between the rectangular baffles and the tank wall, the pressure fluctuations in the novel tank of 0.4 m diameter are measured using high speed acquisition system. The time series of instantaneous pressure in the jet mixing zone are investigated at different radial, circumferential and axial positions under different Reynolds numbers. Time-frequency and energy characteristics of the instantaneous pressure are analyzed and evaluated with the Hilbert-Huang Transform and marginal spectrum. Experimental results indicate that the spatial distributions of instantaneous pressure fluctuation amplitudes increase with the increasing Reynolds numbers. The first order inherent frequencies of power spectrums are lower than 5 Hz. The relationship between power spectral density and frequency accords with power-law attenuation. The scaling exponents range from 0.5 to 1.15 which indicates the existence of fractal characteristics in the pressure fluctuation time series. Compared with the corresponding normal distributions, the probability distribution functions and χ~2 hypothesis tests of the pressure fluctuations have been obtained. The deviations from the normal distribution are quantitatively analyzed based on skewness and flatness.
机译：这部小说流传飞机坦克(公司)激动多个横向飞机已经成为bottom-entering机械的替代品搅拌釜在化学加工工业。为了描述耦合相互作用矩形挡板和坦克墙,小说中的压力波动使用高速0.4米直径的测量采集系统。瞬时压力喷射混合区研究在不同径向圆周在不同雷诺数和轴向位置数字。瞬时压力的特性简要的分析和评估转换和边际谱。结果表明,空间分布瞬时压力波动振幅随着雷诺数增加而增加。一阶固有频率的电力光谱低于5赫兹。功率谱密度与频率符合幂律衰减。这表明指数范围从0.5到1.15分形特征的存在压力波动时间序列。相应的正态分布,概率分布函数和χ~ 2假设测试的压力波动已经获得。正态分布进行了定量分析基于偏斜度和平坦。

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