气—固流化床中颗粒碰撞压力时间序列信号分析与随机模拟

Analysis and Stochastic Simulation of the Time Series Signal of Particle Impact Pressure in Gas Fluidized Beds

对气-固流化床中颗粒碰撞压力的波动现象及其时间序列信号的统计特征进行了探讨. 分析结果表明，颗粒碰撞压力的波动规律与气泡的运动密切相关，所测颗粒碰撞压力是由气泡运动所引起的尾涡颗粒动量传输的结果. 用自回归模型对颗粒碰撞压力信号进行了随机模拟, 模拟结果与实测结果有较好的相似性.

The fluctuation of particle impact pressure and the st℃hastic characteristic of time series signal are investigated. Analysis shows that the fluctuation of the particle impact pressure has close relationship with the motion of bubbles. The particle pressure measured in experiments is the result of the momentum transfer of a body of solids in the wake of a bubble striking an object. St℃hastic signals are also simulated using auto regression [AR(p)] model and the results are very similar to the real signals.