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利用超声多普勒测速仪实验测量了液固循环流化床中不同径向位置处颗粒瞬态轴向速度,研究了其概率密度分布特征。采用瞬态速度的标准偏差衡量瞬态速度的波动程度,考察了不同操作形式下的颗粒时均轴向速度的径向分布以及表观液速和颗粒循环速率等操作条件对速度波动程度和速度均值径向分布的影响。利用相间作用力对两种分布的特点进行了机理分析,并对液固和气固循环流化床中颗粒的流动行为进行了比较。
The instantaneous axial velocity of particles at different radial positions in liquid-solid circulating fluidized bed was measured by ultrasonic Doppler velocimetry and the distribution of its probability density was studied. The standard deviation of transient velocity was used to measure the fluctuation of transient velocity. The radial distribution of average axial velocity of particles under different operating modes and the effects of operating conditions such as apparent liquid velocity and particle circulation velocity on the velocity fluctuation and velocity Effect of mean radial distribution. The mechanism of the two distributions is analyzed by the interphase force, and the flow behavior of the particles in liquid-solid and gas-solid circulating fluidized bed are compared.