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EFFECT OF SURFACE PATTERNING ON THE DYNAMIC RESPONSE OF ANNULAR HOLE-PATTERN SEALS

机译:表面打孔对环形孔型密封件动力响应的影响

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The performance of annular seals depends on the geometry of the leakage path as it facilitates the dissipation of the fluid kinetic energy. The goal of this study is to investigate potential correlations between the characteristics of the alternately arranged surface pattern and the corresponding rotor dynamic properties of the seal in addition to mapping its performance. Various patterning arrangements lining the stator surface are considered and the relative seal performance change is investigated using a hybrid method that calculates the seal dynamic response for each point in the design space. The design parameters selected in this DOE study are: the diameters of alternately arranged holes that are replicated in both axial and circumferential direction to construct the pattern, the hole depths for both types of holes, and the number of holes in both axial and circumferential directions. A sensitivity study is conducted to analyze the influence of each geometrical parameter on the seal response. Regression models are then generated for each response, including the leakage rate and the rotor dynamic coefficients. Quadratic regression models are used in this study to represent the relationship between the objective functions and the design parameters. The goal is to achieve a minimum leakage rate as well as an improved dynamic response. The results of the baseline model and the best performing design are compared. The results show that the patterning arrangements have crucial effects on the leakage rate as well as the dynamic coefficients of the seal. The results of this study are found to be helpful in designing a hole-pattern seal that can concurrently satisfy constraints on both the leakage rate and the rotor dynamic response while maintaining same design envelope.
机译:环形密封件的性能取决于泄漏路径的几何形状,因为它有助于耗散流体动能。这项研究的目的是研究密封布置的表面图案特征与密封件相应的转子动态特性之间的潜在相关性。考虑到衬套在定子表面上的各种图案布置,并使用混合方法研究相对密封性能变化,该混合方法计算设计空间中每个点的密封动态响应。在DOE研究中选择的设计参数是:沿轴向和周向复制以构造图案的交替排列的孔的直径,两种类型的孔的孔深以及沿轴向和周向的孔数。进行了敏感性研究,以分析每个几何参数对密封响应的影响。然后为每个响应生成回归模型,包括泄漏率和转子动态系数。本研究使用二次回归模型来表示目标函数和设计参数之间的关系。目的是实现最小的泄漏率以及改善的动态响应。比较基线模型和最佳设计的结果。结果表明,图案布置对泄漏率以及密封件的动态系数具有至关重要的影响。发现该研究结果有助于设计一种孔型密封件,该密封件可以同时满足对泄漏率和转子动态响应的约束,同时保持相同的设计范围。

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