Inlet preswirl dependence research on three different labyrinth seals

Zhang, Xiang; Jiao, Yu; Qu, Xiuquan; Zhao, Zhiqian; Huo, Guanghe; Huang, Kai

doi:10.1016/j.triboint.2022.107929

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…The 𝐹 𝑡 is chosen as the evaluation parameter. As shown in Table 3, the 𝐹 𝑡 of the studied seal shows insensitivity to the increasing mesh density when the element number is larger than 2.4×10 6 (the difference is within 1.5 % compared with the 5.6×10 6 case). The mesh density of 2.4×10 6 elements can meet the mesh independence.…”

Section: Methodsmentioning

confidence: 93%

“…The result shows that when compared to the interlocking LS, the teeth-on-stator type has a larger effective damping coefficient for operation with whirl frequency up to 30 % above the synchronous rotor speed. Zhang et al [6] numerically studied the impact of inlet preswirl on the rotordynamic performance of three types of LSs. They found that negative preswirl is beneficial to the stability of LSs.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the flow-induced tangential force characteristic of labyrinth seals under different operation parameters

Gu¹,

Yang²

2023

Vib. proced.

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The flow-induced tangential force Ft is crucial for the annular gas seal stability. In this paper, a three-dimensional CFD model is established to study the Ft characteristics of the labyrinth seal. The overall Ft of the seal section is decomposed into each seal cavity. The Ft characteristic of each seal cavity versus rotation speed ω and inlet pressure pin is analyzed. The result shows that the sign of Ft in each seal cavity changes from the negative to the positive along the leakage direction, resulting in a specific crossing tooth number Nc at which Ft≈ 0 N. When the tooth number is smaller than Nc, the seal stability increases with the increase of ω and pin. When the tooth number is larger than Nc, the trend is reversed. When the tooth number equals Nc, the seal stability is in a critical state, showing no dependency to the ω and pin. The Nc is a novel index for the labyrinth seal stability.

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Section: Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%