刚性离心级联水力学特性分析

为了解刚性级联的水力学性能，本文求解了重馏分管道安装声速孔板的刚性级联的扰动方程，得到了刚性级联的静态特征根。刚性级联仅2个静态特征根Z₁和Z₂，Z₁等于1，Z₂为级联的主静态特征根，用于判断级联的静态稳定性。离心机工作在额定工况附近时，刚性级联主静态特征根大于1。某级出现损机后，级联的流体参数发生变化，导致级联分离功率下降。利用绝对变化量进行求解，可得到流量变化量的解析解，解析解与数值解存在一定差异，但具有相同的变化趋势，可利用解析解预测级联受到扰动后的流体状态参数变化趋势。由于扰动向贫料方向传播，虽然主静态特征根大于1，级联仍能保持稳定。

Analysis of Hydraulic Characteristic of Rigid Cascade

In order to understand the hydraulic characteristics of rigid cascade ,the static characteristic roots were obtained by solving the perturbation equations of rigid cascades which have sonic orifice on the heavy fraction pipes .The rigid cascades only have 2 static characteristic roots .Z1 is equal to 1 ,and Z2 is the main static characteristic root and can be used to predict the stability of the cascade .When centrifuge works at rated condi‐tion ,the main static characteristic root is greater than 1 .If any centrifuge is in a stage fail ,the fluid parameters can be obtained by solving perturbation equations .The analytic solution can be used to predict the changing trend of fluid parameters if the cascade is disturbed .Although the main static characteristic root is greater than 1 ,as the disturb‐ances propagate to the waste end ,the rigid cascade can maintain the stability .