The Development of High-Performance Leaf Seals

Nakane, Hironobu; Maekawa, Akihiro; Akita, E.; Akagi, Koichi; Nakano, Takashi; Nishimoto, Shin; Hashimoto, S.; Shinohara, Tanehiro; Uehara, Hidekazu

doi:10.1115/1.1615257

Cited by 17 publications

(10 citation statements)

References 3 publications

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“…Nakane et al 143 reported leakage performance of a leaf seal at less than 1/3 that of an for radial, circumferential and axial shaft motions. Even though the wafer seal is depicted with a low mobility wall, this restraint is not required.…”

Section: Leaf and Wafer Sealsmentioning

confidence: 99%

Section: Leaf and Wafer Sealsmentioning

confidence: 99%

“…114 The leaf seal as described by Flower 142 and Nakane et al 143 ( fig. 57) 143 The leaf and wafer seals have similar encapsulation but differ in root attachment and moments of inertia or cross section. The stacked leaves (or wafers) are relatively free to move in the radial direction and are deformable along the length or circumference providing a compliant restrained two-dimensional motion as opposed to the brush-seal-bristle, which deforms in three dimensions.…”

Section: Leaf and Wafer Sealsmentioning

confidence: 99%

See 2 more Smart Citations

Turbomachinery Clearance Control

Chupp

Hendricks

Lattime

et al. 2014

Turbine Aerodynamics, Heat Transfer, Materials, and Mechanics

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Section: Leaf and Wafer Sealsmentioning

confidence: 99%

Section: Leaf and Wafer Sealsmentioning

confidence: 99%

Section: Leaf and Wafer Sealsmentioning

confidence: 99%

See 1 more Smart Citation

Turbomachinery Clearance Control

Chupp

Hendricks

Lattime

et al. 2014

Turbine Aerodynamics, Heat Transfer, Materials, and Mechanics

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show abstract

“…As a non-contact seal, the gas film seal has become a highly potential seal form in the application of turbomachinery such as a compressor because of its advantages of low leakage and long service life. 1–4 The intershaft seal, an important seal aimed at sealing the intermediate bearing which supports the two rotors in a dual-rotor aero-engine, bears a harsh working condition to meet the requirements of high speed, high temperature, high pressure difference and high reliability. Due to the disadvantage of large leakage in the current intershaft labyrinth seal, researchers expect to adopt the promising gas film seal to improve this problem.…”

Section: Introductionmentioning

confidence: 99%

An analysis method of pressure characteristic for cylindrical intershaft gas film seal considering centrifugal expansion, rotor misalignment, and precession

Guo-qiang

Huang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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To improve the weaknesses of large leakage and wear of dual-rotor intershaft labyrinth seal in aero-engines, the cylindrical gas film seal of metal rubber with a compliant feature is proposed to substitute this conventional seal. According to the dual-rotor operating condition, an analysis method of gas film pressure is presented considering the complex condition of rotor tilt, centrifugal expansion effect, and rotor circular precession. The characteristics of gas film pressure distribution are computed and comparisons are conducted in a complex operating state that the tilt rotor is in forward/backward circular precession under a homodromous/counter-rotating condition with/without the influence of centrifugal expansion. Besides, the formation mechanism of the gas film pressure caused by rotor rotational direction and circular precession direction is revealed. Also, the influence of rotor speed and seal ring speed on gas film pressure is analyzed when the rotor is tilted. The results indicate that for the dual-rotor cylindrical gas film seal with high rotating speed, the rotor tilt and centrifugal expansion effect have significant influence on the gas film pressure distribution, and the rotors’ rotational direction as well as rotor circular precession direction determines the maximum gas film pressure distribution area. The maximum pressure under a homodromous condition with backward precession is the highest; the maximum pressure under a homodromous condition with forward precession is the lowest. The former is 1.33% and 1.68% higher than the latter, respectively, with/without consideration of centrifugal expansion. The study method, which is generally suitable for the cylindrical gas film seal with single-rotor/dual-rotor, lays the foundation of performance analysis under complex operating conditions.

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“…Therefore, the fluid dynamic sealing technology is studied to apply it to highspeed fluid machinery such as aero engines, which has received much attention. 3 Ma et al have done extensive research in cylindrical gas seal and studied the design of spiral groove structure, dynamic characteristics analysis and interface structure.…”

Section: Introductionmentioning

confidence: 99%

Research on operating parameters of T-groove cylindrical gas film seal based on computational fluid dynamics

Sun

Liu

et al. 2019

Advanced Composites Letters

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Cylindrical gas film sealing technology is a new type of dry gas sealing technology. Compared with the face gas film sealing technology, the cylindrical gas film seal presents a strong floating property, which can reduce the vibration and thermal deformation of the rotor system. In this article, the effect of operating parameters such as speed, pressure difference and viscosity on the T-groove gas cylindrical film seal performance are studied in detail by the method of control variable in computational fluid dynamics software, and pressure distribution, gas film stiffness, leakage, leakage stiffness ratio and hydrodynamic force are analysed. Results show that with the increase of the rotational speed, static pressure, hydrodynamic force and film stiffness increase, but leakage decreases first and then increases. Furthermore, the results indicate that with the increase of pressure difference, the static pressure, leakage and hydrodynamic force increase. In addition, the simulations show that when the viscosity increases, the maximum pressure and film stiffness increase, but the leakage decreases. This indicates that as the rotational speed increases, the hydrodynamic effect and the amount of gas overflow in the axial direction increase, resulting in an increase of leakage. Lastly, the results also show that when the pressure difference increases, both the radial and axial gas flow rates increase, resulting in an increase in both the film stiffness and the leakage. With the increase of viscosity, the viscous shear force and fluid hydrodynamic force increase, resulting in the increase of the gas film stiffness. This study can provide a theoretical basis in industrial applications for setting the operating parameters and serving as a reference.

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The Development of High-Performance Leaf Seals

Cited by 17 publications

References 3 publications

Turbomachinery Clearance Control

Turbomachinery Clearance Control

An analysis method of pressure characteristic for cylindrical intershaft gas film seal considering centrifugal expansion, rotor misalignment, and precession

Research on operating parameters of T-groove cylindrical gas film seal based on computational fluid dynamics

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