Simplified Improvement of Higher Order Extended Bulk Flow Analysis Specialized for Derivation of Rotordynamic Coefficients of the Annular Plain Seal With Large Static Eccentricity
Simplified Improvement of Higher Order Extended Bulk Flow Analysis Specialized for Derivation of Rotordynamic Coefficients of the Annular Plain Seal With Large Static Eccentricity
复制标题
高阶扩展体流分析的简化改进，专门用于推导大静偏心率环形滑动密封件的转子动力系数
DOI：
10.1115/1.4054680
复制
发表时间：
2022
影响因子：
2
通讯作者：
Yamada Koya
中科院分区：
文献类型：
--
作者：
Inoue Tsuyoshi;Yamada Koya
涡轮机械的转子动力（RD）流体力被认为是轴振动问题的原因之一。整体流动分析是RD流体力的分析方法，广泛应用于设计阶段。传统的整体流分析基本上是在同心圆旋转轨道的假设下进行的。而实际的叶轮机械由于静载荷等的影响，常常处于静偏心运行。然而，针对较大静偏心情况，特别是超过一半密封间隙的情况进行研究的研究并不多。本文重点研究了静偏心距达到密封间隙65%范围内的平面环形密封的线性RD系数。在这个静偏心率范围内，需要将非线性分析扩展到五阶，并且大大增加了需要求解的方程数量。本文提出了高阶扩展整体流（SHEBF）分析的简化，从而显着减少了需要求解的解析方程的数量。该方法的有效性得到了数值和实验的证实。
Rotordynamic (RD) fluid force of turbomachinery is known as one of the causes of the shaft vibration problem. Bulk flow analysis is the analytical method of RD fluid force, and it is widely used in design stage. Conventional bulk flow analysis has been basically carried out under the assumption of concentric circular whirl orbit. While, the actual turbomachinery is often operated with static eccentricity due to the effect of static load and so on. However, there are not many studies that have investigated the case with large static eccentricity, in particular, the case more than half the seal clearance. In this paper, the linear RD coefficient for the plain annular seal is focused on and examined for the range that static eccentricity is up to 65% of seal clearance. In this range of static eccentricity, it requires the nonlinear analysis extended to the fifth order and largely increases the number of equations to be solved. This paper proposed simplification of higher order extended bulk flow (SHEBF) analysis, and as a result, the number of analytical equations to be solved is significantly reduced. The validity of this method is confirmed both numerically and experimentally.