Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

Ha, Yunseok; Ha, Tae-Woong; Byun, Jaeseung; Lee, Yongbok

doi:10.1177/1687814020913676

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…However, Haynes 25 is still preferred for steam turbine brush seals where-high temperature tolerance and resilient bristles are needed. As suggested by Yunseok et al, the dynamic characteristics of tribo-elements have been utilized to analyse a given rotordynamic system [9]. Additional stiffness or damping could be the source of destabilizing force, inducing the steam whirl.…”

Section: Rotordynamic Characteristics Of a Single Brush Sealmentioning

confidence: 99%

Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts

Omenife,

Desai,

Dunne

2024

Sci. Eng. Technol.

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High-speed turbines are a major source for power production. They utilize high pressure and temperature fluid flow. Sealing of these machines to decrease the flow losses has been a major engineering challenge since the inception of steam turbines. From an engineering viewpoint, seals are used to introduce friction in the fluid flow path. This reduces the flow leakage. Improved seal performance offers substantial opportunities for turbine performance. Reduced leakages in steam turbines can lead to greater efficiency and power output. They can also allow tighter control of turbine secondary flows. However, sealing these machines is a major challenge. There are several seal locations on a steam turbine that have significant performance derivatives. These include the interstage shaft packing, the end packing, and the bucket tip seals. Brush seals are ideal for these locations because they can reduce the flow losses. This study analysed the efficiency of the steam turbine by using ANSYS APDL. It assessed the leakage performance of the brush seal for different cases and geometries. It also used porous medium modelling of the bristle pack to provide insight for designers. The outputs of interest were the rotor-shaft temperature and the efficiency of the entire turbine with the brush seal.

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Section: Rotordynamic Characteristics Of a Single Brush Sealmentioning

confidence: 99%

Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts

Omenife,

Desai,

Dunne

2024

Sci. Eng. Technol.

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“…The numerical model is established according to the brush seal of KIST [40][41][42], and the detailed structural parameters are shown in Table 2. The computational domain is divided into the solid, fluid, and porous areas of the bristle pack zone, as shown in Figure 7.…”

Section: Cfd Model and Structure Of The Brush Sealmentioning

confidence: 99%

Temperature Field and Performance Analysis of Brush Seals Based on FEA-CFD and the Porous Medium of Anisotropic Heat Transfer Models

Song,

Liu,

Sun

et al. 2023

Energies

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A brush seal is a type of contact sealing technology that generates a great amount of heat during operations. The heat can affect the seal’s performance and lifespan. To study the brush seals’ temperature distribution, a new model considering the anisotropic heat transfer effect is established in this paper. The friction heat effect at the bristles’ tip is studied. The temperature field and leakage rates are obtained by using combined finite element analysis (FEA)-computational fluid dynamics (CFD) analysis and the anisotropic heat transfer theory. The influence of operating and structural parameters on the temperature field and the sealing properties of the brush seal are investigated. It is shown that the value of the rotation rate and the interference can cause the temperature of the brush seal to increase. The pressure difference enhances the convective heat transfer from the brush seals. While the temperature at the bristles’ tip increases, the radial average temperature of the bristles decreases significantly. In the case of a small pressure difference, the fence’s height can increase the windward area, leading to stiff bristles and resulting in a temperature increase at the bristles’ tip; however, the effective flow area increases, resulting in an acceleration of the radial temperature’s decrease. To summarize, the porous medium model of anisotropic heat transfer provides a new method for studying brush seals, and it can reflect the temperature distribution and leakage performance of brush seals.

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Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

Cited by 2 publications

References 30 publications

Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts

Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts

Temperature Field and Performance Analysis of Brush Seals Based on FEA-CFD and the Porous Medium of Anisotropic Heat Transfer Models

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