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流型是气固两相流过程中极具工程意义的检测对象。文中在输送压力可达4 MPa的加压气力输送中试试验台上,分别进行了输送物料为石英砂和煤粉的流型可视化试验,随着表观气速的降低,获得了不同流型。试验研究表明物料性质、表观气速和浓度均对两相流型有着重大影响。为了深入剖析流型与压力信号特征之间的关联,将Hilbert-Huang变换应用于加压气力输送过程的压力信号分析,得到不同流型状态下压力信号的Hilbert谱,讨论了频率段的不同划分情形对流型区分度的影响,进而分析不同频段的能量分布与流型的关系,有助于深入理解加压气力输送流动形态及其变迁规律。
The flow pattern is an extremely engineering test object in the gas-solid two-phase flow. In the Pilot Pilot Station of Pneumatic Pneumatic Conveying Pilot with conveying pressure up to 4 MPa, flow pattern visualization experiments were carried out on the quartz sand and pulverized coal respectively. With the decrease of superficial gas velocity, different flow patterns . Experimental studies have shown that material properties, superficial gas velocity and concentration all have a significant impact on two-phase flow patterns. In order to deeply analyze the correlation between flow pattern and pressure signal characteristics, the Hilbert-Huang transform is applied to the pressure signal analysis of pressurized pneumatic conveying to obtain Hilbert spectra of pressure signals under different flow regimes. The different division of frequency segments And then analyze the relationship between energy distribution and flow pattern in different frequency bands, which is helpful to understand deeply the flow pattern and its changing rule of pressurized pneumatic conveying.