基于静电传感器空间滤波效应的颗粒速度测量

颗粒的流动速度是反应气固两相流流动状况的一个重要参数。介绍了静电传感器的空间滤波特性，推导了颗粒流动速度与静电传感器输出信号频率特性之间的关系。在此基础上，提出了一种基于静电传感器空间滤波效应的颗粒平均速度测量方法，并分析了静电传感器结构参数、颗粒截面分布、颗粒速度分布、颗粒尺寸、材料种类以及频率分辨率等因素对颗粒平均速度测量精度的影响。在重力输送颗粒流实验装置上进行了初步的实验研究。理论和实验结果均证明了静电传感器空间滤波颗粒平均速度测量方法的有效性。

Solid particle velocity measurement based on spatial filtering effect of electrodynamic sensor

Particle velocity is an important parameter describing the flow state of gas-solid two-phase flow. A measurement method of solid particles mean velocity based on the spatial filtering effect of the electrodynamic sensor was developed. The spatial filtering characteristics of the electrodynamic sensor were described quantitatively, from which the relationship between the frequency characteristics of the output signal of the electrodynamic sensor and particle velocity was obtained. The effects of geometry parameters of the sensor, particle velocity distribution, particle concentration distribution in the pipe cross section, particle size, particle type and frequency resolution on the measurement of particles mean velocity were also investigated. Off-line experimental results in a gravity-fed particles flow apparatus were presented. The measurement method was verified by the fundamental theoretical and experimental results.