平衡鼓和平衡盘的系统模型及应用

System Model and Application of Balancing Drum and Balancing Disc

针对叶轮机的两种典型轴向力平衡装置-平衡鼓和平衡盘,建立了系统模型,它包括普通的数学模型,还包括典型平衡鼓和平衡盘的基本结构以及功能参数特征。定义了3个参数来提取这两个轴向力平衡装置的共性规律,分别是边界条件系数比、液阻系数比和流量对压力变化的敏感度。通过模拟4种典型应用对模型进行分析,包括流道2的边界条件对平衡鼓平衡力、流量敏感度k2的影响;流道1处密封性能对平衡鼓平衡力、流量的影响;流道3封闭时平衡盘平衡力、流量敏感度k1与边界条件系数比的关系;流道4处密封性能对平衡盘平衡力、流量的影响。

According to turbines＇ two typical axial force balance devices, balancing drum and balancing disc, a system model was developed, which contains general mathematic model, basic structure and function parameters characteristic of typical balancing drum and balancing disc. Three parameters of boundary condition coefficient ra- tion, fluid resistance coefficient ration and the sensitivity of flow to pressure changes were defined to extract com- mon laws of these two axial force balance devices. And the model was analyzed by simulation of four typical appli- cations： the effect of boundary conditions of flow 2 on the balance drum＇s balance force and the flow sensitivity k2, the effect of sealing performance of flow 1 on balance drum＇s balance force and flow, the relation of boundary condi- tions coefficient ration with the balance disc＇s balance force and the flow sensitivity k1, and the effect of sealing per- formance of flow 4 on balance disc＇s balance force and flow.