高校化学工程学报Issue(1)：11-19,9.DOI:10.3969/j.issn.1003-9015.2015.01.002
湍动流化床过渡段中颗粒速度分布的光纤测量与模拟
Particle Velocity Measurements in Transition Section of Turbulent Fluidized Beds Using Optical Fiber Probe and CFD Simulation
摘要
Abstract
Measurement of particle velocity in fluidized beds is always technically difficult. A new method based on cross-correlation principle was proposed to calculate time-averaged velocity of particles. Considering the different reliabilities of signal segments, a cross-correlation coefficient was introduced into the formula for calculating time-averaged velocity. A PV6D optical fiber probe was used to obtain original signals in a fluidized bed with 200 mm i.d., and the time-averaged velocities calculated from three different methods were compared. The calculated particle volume flow rates based on different velocity calculating methods indicate that the method proposed in this paper is more reliable. Based on this method, particle time-averaged velocity was measured at different heights in the transition section of a turbulent fluidized bed. A modified three-zone drag law model was used to predict the flow structure of particles with clustering behavior. The experimental and simulation results both indicate that, from the transition section to the dilute section, particle velocity of the core region rises at first and then declines, the radial velocity distribution changes from a steep curve to a flat one, and then becomes steep again. This result depends on both solid concentration distribution and gas velocity distribution.关键词
流化床/颗粒速度/光纤/计算流体力学Key words
fluidized bed/particle velocity/optical fiber probe/computational fluid dynamics (CFD)分类
化学化工引用本文复制引用
吴诚,高用祥,高希,成有为,王丽军,李希..湍动流化床过渡段中颗粒速度分布的光纤测量与模拟[J].高校化学工程学报,2015,(1):11-19,9.基金项目
国家自然科学基金(U1162125)；中央高校基本科研业务费专项资金(2013QNA4035)。 （U1162125）
