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为了提高离心级联的分离效果,研究了各级机器参数扰动时所引起的流体状态偏移。在求解离心级联水力学静态特征根的基础上,以扰动级为界,通过对级联贫化、浓化部分分段求解,得到了水力学流体状态偏移的解析解,并用数值实验加以验证。结果表明:对于小扰动情况下的离心级联,用解析与数值2种方法得到的流体状态偏移曲线十分相似,主静态特征根Z2对级联中压强和流量的偏移起主导作用。因此,该解析解可以为实际离心级联参数的调整和设计提供参考依据。
In order to improve the separation effect of centrifugal cascade, the fluid state shift caused by disturbance of machine parameters at all levels was studied. On the basis of solving the static characteristic roots of centrifugal cascade hydraulics, with the disturbance level as the boundary, the analytic solution of the hydromechanical fluid state deviation is obtained by solving the cascade dilution-depletion and the enrichment section separately, and the experimental results are obtained by numerical experiments verification. The results show that for the cascades with small perturbation, the fluid state curves obtained by the analytical and numerical methods are very similar. The main static characteristic root Z2 plays a dominant role in the pressure and flow displacements in the cascade. Therefore, the analytical solution can provide a reference for the adjustment and design of the actual centrifugal cascade parameters.