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在提升管直径为0.06 m,高度为5 m的冷态流化床试验装置上,使用基于信号奇异性检测的小波模极大值法,研究鼓泡流态化到湍动流态化的流型转变特性,获得相应的流型转变初始速度。使用压力波动平均振幅法和标准偏差法对压力波动信号进行分析,得到的转变初始速度相互之间的最大标准偏差为10.8%,说明这3种方法均能正确判断鼓泡流态化到湍动流态化的流型转变初始速度。与后两种方法相比,小波模极大值法有使用数据量少、分析速度快的优点。
In a cold fluidized bed test apparatus with a riser diameter of 0.06 m and a height of 5 m, a wavelet modulus maximum method based on signal singularity detection was used to study the effects of bubbling fluidization to turbulent fluidized fluidization Type transition characteristics, get the appropriate initial rate of flow transition. The pressure fluctuation signal was analyzed using the method of pressure fluctuation average amplitude and standard deviation, and the maximum standard deviation of the initial transition speeds was 10.8%, which shows that all three methods can correctly determine the bubbling fluidization to turbulent Fluidized flow patterns change the initial speed. Compared with the latter two methods, the wavelet modulus maxima method has the advantages of less data usage and fast analysis speed.