Study on the Rotordynamic Performance of a Novel Anti-stagnation Labyrinth Seal

Zhang, Wanfu; Gu, Qianlei; Wang, Tengxi

doi:10.1007/s42417-019-00191-4

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…They found that negative preswirl is beneficial to the stability of LSs. Zhang and Gu [7] proposed a novel anti-stagnation LS with micro-nozzles on adjacent seal teeth. The high-speed jet, driven by the intrinsic pressure difference in the seal domain, is injected into the seal cavity with the direction opposed to the circumferential flow.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Gu¹,

Yang²

2023

Vib. proced.

Self Cite

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“…[9][10][11]. Zhang et al [12] proposed a novel anti-stagnation labyrinth seal structure. It was found that the new seal has better stability compared to the traditional labyrinth seal.…”

Section: Introductionmentioning

confidence: 99%

CFD-Predicted Rotordynamic Characteristics for High-Temperature Water Liquid Seal Considering Tooth Deformation

Chen

Wang

et al. 2022

Lubricants

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With the development of high-temperature centrifugal pump, the temperature of the medium in the pump must be higher than the normal water temperature. It is particularly important to study the rotordynamic characteristics of the seal at high temperature due to it being the core component of the rotor system. This paper takes the high temperature water liquid seal as a research object to study its rotordynamic characteristics based on the fluid-solid-thermal coupling, the deformation of seal teeth under thermal and dynamic loads was calculated. Based on the test rig, the leakage flow rate and drag power loss of water liquid seal at 20 °C, 50 °C, and 86 °C temperatures were tested and compared with the CFD (Computational Fluid Dynamics) calculation. Meanwhile, the DEFINE-CG-MOTION and DEFINE-PROFILE control macro were used to establish the rotor whirling equation, the frequency-independent rotordynamic coefficients (K, k, C, c) and frequency-dependent rotordynamic coefficients (Keff,Ceff) were evaluated by transient CFD method. This analysis was done at three different pressure drops (2.08, 4.12, and 8.25 bar) and three rotational speeds (2000, 4000, and 6000 r/min). The results show that with the increase of water temperature, both the leakage flow rate and drag power loss decrease, indicating the 86 °C water seal has a better sealing capacity. From the rotordynamic perspective, with the increase of water temperature, the direct stiffness coefficient decreases, and the effective stiffness coefficient Keff for 20 °C water seal possesses a better stiffness capability than the other two temperature seals. The effective damping coefficient Ceff for 20 °C water seal is larger than the other two temperature seals, which means it is more stable for the rotor system.

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“…Li et al [19] performed a comparison of rotordynamic performance for three types, TOS, TOR, and ILS, of labyrinth seals, and the TOS labyrinth seal revealed the best stability among the three seals. Zhang et al [20] investigated the rotordynamic performance of a novel anti-stagnation labyrinth seal. The results showed that the stability of anti-stagnation had a positive tendency as the rotation speed and inlet pressure increased.…”

Section: Introductionmentioning

confidence: 99%

Study on Leakage Performance and Rotordynamic Characteristics of a Novel Semi-Y Type Labyrinth Seal

Shi

Zhou

2022

Lubricants

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A new type of labyrinth seal with semi-Y of rotor teeth (SYLS) is proposed in this paper. The rationality and accuracy of the numerical model are validated by the experimental results, and the static characteristics are investigated. Furthermore, the effects of pressure drop, rotation speed, tilt angle, and tip clearance on the dynamic coefficients and stability are also studied in detail. The results imply that the novel SYLS structure generally has better leakage and stability performance compared with the traditional labyrinth seal. The maximum error applied in the numerical simulation is only 2.81%, and the worst leakage occurs when the tilt angle is 70° for the SYLS structure due to the smaller vortex dissipation. Moreover, the novel SYLS structure shows the best stability when the tilt angle is 45°. The novel SYLS structure and corresponding results can provide a reference for the research and design for labyrinth seal and the application of centrifugal pump.

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Study on the Rotordynamic Performance of a Novel Anti-stagnation Labyrinth Seal

Cited by 6 publications

References 19 publications

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

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

CFD-Predicted Rotordynamic Characteristics for High-Temperature Water Liquid Seal Considering Tooth Deformation

Study on Leakage Performance and Rotordynamic Characteristics of a Novel Semi-Y Type Labyrinth Seal

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