离心式风机系统离散频率气流脉动特性的研究

The Investigation of the discrete Frequenies Characteristics of the Gas flow Pulsation in the Centrifugal Fan System

本文提出用与风机叶片数相关的周期性的速度激发及角速度微小变化函数,来模拟风机包括附件对管道系统的作用。用一维非稳定流理论对气流脉动进行了计算,计算曲线和实验曲线基本一致,因此,这种模拟函数能较好地描述风机对系统气流脉动的离散频作用。

In this paper, it is developed that the action of the centrifugal fan with its attchment on piping system is simulated by the periodic velocity exciting function related to the number of blades of centrifugal fan and micro-change function of angular velocity. The gas flow pulsation unstable stream theory. The calculated curve is basically consistent with the experimental curve. Therefor, it is better that the simulating function decribes the action of the discrete frequenies of the centrifugal fan on the stream system.