Simulation and Flow Analysis of the Hole Diaphragm Labyrinth Seal at Several Whirl Frequencies

Xiang Zhang, Yinghou Jiao, Xiuquan Qu, Guanghe Huo and Zhiqian Zhao
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Xiang Zhang: School of Mechatronics Engineering, Harbin Institute of Technology, 92 Xi Da Zhi Jie, Nangang Qu, Harbin 150001, China
Yinghou Jiao: School of Mechatronics Engineering, Harbin Institute of Technology, 92 Xi Da Zhi Jie, Nangang Qu, Harbin 150001, China
Xiuquan Qu: School of Mechatronics Engineering, Harbin Institute of Technology, 92 Xi Da Zhi Jie, Nangang Qu, Harbin 150001, China
Guanghe Huo: School of Mechatronics Engineering, Harbin Institute of Technology, 92 Xi Da Zhi Jie, Nangang Qu, Harbin 150001, China
Zhiqian Zhao: School of Mechatronics Engineering, Harbin Institute of Technology, 92 Xi Da Zhi Jie, Nangang Qu, Harbin 150001, China

Energies, 2022, vol. 15, issue 1, 1-18

Abstract: The seal is designed to reduce leakage and improve the efficiency of gas turbine machines, and is an important technology that needs to be studied in gas turbine design. A series of seals were proposed to try to achieve this goal. However, due to the complex fluid dynamic performance of the seal-rotor system, the seal structure can obtain both the best leakage performance and best rotordynamic performance. This paper presents a detailed flow analysis of the hole diaphragm labyrinth seal (HDLS) at several whirl frequencies and several rotation speeds. The pressure drop, velocity, turbulence kinetic energy and leakage performance of the HDLS were discussed by simulations. An interesting exponential–type relationship between rotation speeds and leakage flow at different whirl frequencies was observed by curve fitting technology. A reverse flow rate was proposed to describe such an unusual phenomenon. Such a relationship can be used to further establish the leakage model of the HDLS and other similar seals.

Keywords: labyrinth seal; turbulence kinetic energy; streamline analysis; vortex dissipation; leakage; CFD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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