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在内径 5 0 0 mm的大型半圆型流化床中 ,以属于 Geldart D类的小米为试验物料 ,使用的半圆形喷口内径 42 mm。利用多路压力信号快速循环采集系统和快速傅立叶变换分段功率谱方法采集和处理数据。结果表明射流崩塌的频率随喷口射流气速的增大而增大 ,随静床高度的增大而减小。同时应用摄像法 ,考察了射流深度与喷口射流气速、静床高度的关系 ,结合 30 0× 5 0 mm二维射流床的实验结果 ,得到了射流深度的定量关系式
In a large semicircular fluidized bed with a diameter of 500 mm, millet belonging to Geldart class D was used as test material and the semicircular nozzle was used with an inner diameter of 42 mm. The multi-channel pressure signal fast-cycle acquisition system and fast Fourier transform section power spectrum method are used to collect and process the data. The results show that the frequency of jet collapse increases with the increase of jet velocity and decreases with the increase of bed height. At the same time, the relationship between the jet depth and the jet velocity and the height of the static jet was investigated. The quantitative relationship between the jet depth and the jet velocity was obtained by combining the experimental results of a 30 × 500 mm two-dimensional jet bed