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中文摘要：
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。
英文摘要：
Flow regime is of great engineering significance in gas-solid two-phase flow processes. Experimental research on flow regimes of pressurized gas-solid flow was conducted on a pilot scale experimental setup at pressure up to 4 MPa, choosing quartz powder and pulverized coal as conveyed material, respectively. With the decrease of superficial gas velocity, different flow regimes were observed. Experiments show that the flow regime is dramatically affected by the properties of the conveying material, superficial gas velocity and concentration of particles. In order to deeply reveal the relationship between flow regimes and characteristics of pressure signals, Hilbert-Huang transform（HHT）was applied to analyze the pressure signal of pressurized pneumatic conveying process. Firstly, Hilbert spectrums were obtained under different flow regimes. Secondly, the influences of different cases of dividing frequency bands on distinguish degree were discussed. Finally the association between the energy distribution of different frequency bands and the flow regime was analyzed. This paper contributed to better understanding of the flow state and its transition of pressurized pneumatic conveying.
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