离心式风机气流系统离散频率声学特性及计算方法的研究

本文利用稳态气流的变更方程,建立了风机叶轮的转移矩阵。这是多级叶轮气流系统离散性频率声学特性的一个基衣公式。为了讨论离散性频率噪声,本文提出了多叶叶道流速激发的概念和计算公式。与风机负荷的波动相关,风机转子的角速度变化及相伴的低频拍振是不可避免的。本文还推荐了一些降低拍振振幅的措施。

STUDY OF ACOUSTIC CHARACTERISTICS IN DISCRETE FREQUENCY AND NUMERICAL METHOD OF THE GAS FLOWING SYSTEM OF CENTRIFUGAL BLOWER

In this paper, a transition matrix of blower blade is set up by the varia tion equation of stead flow of gas. It is a basic formula of acoustic characteristics in discrete frequency of the blade in which the gas flowing has many classes. A concept and a numerical formula of flowing velocity on many blades are presented to discuss noise in the discrete frequency. Because of oscillation of the blower load the variation of angular velocity of the blower rotor and beats in lower frequency are inevitable. Some methods by which the beats can be decreased are recommended.