Performance analysis of compliant cylindrical intershaft seal

Guo-qiang, Hou; Su, Hua; Chen, Guoding; Yu-hai, Tian

doi:10.1177/0036850420941957

Cited by 8 publications

(6 citation statements)

References 24 publications

(27 reference statements)

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“…If u s ðrÞ and u s ðrÞ are both 0, the question will degenerate into the case of rigid surface without centrifugal expansion. In this situation, the method is consistent with that in literature [3,20]. Figure 5 shows the nondimensional pressure distribution on the axial middle plane computed by the core program.…”

Section: Verification Of Accuracysupporting

confidence: 80%

“…Figure 6 shows relevant results reported in the literature that have been obtained under the same conditions. 3,20 Comparing Figure 5 and Figure 6, we observe that the results are highly consistent with each other. Hence, it can be concluded that the core program is validated.…”

Section: Verification Of Accuracysupporting

confidence: 77%

“…Under special cases, the operating conditions of the intershaft seal are much worse than that of the conventional dynamic seal. 3 To address the shortcomings of the intershaft labyrinth seal, such as significant leakages and wear of the tooth tips, researchers have proposed a variety of seal structures. These studies mainly focus on two aspects: the contact intershaft seal represented by the brush seal, and the non-contact intershaft seal represented by the gas film seal.…”

Section: Introductionmentioning

confidence: 99%

“…They also investigated the natural vibration stability of the floating seal ring. Hou et al 3 reported the seal mechanism of a compliant cylindrical intershaft gas film seal. Their study explained the effect of geometric and operating conditions on the seal performance of rigid surfaces.…”

Section: Introductionmentioning

confidence: 99%

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An analysis method for the performance of compliant cylindrical intershaft gas film seal considering centrifugal expansion effect

Guo-qiang

Chen

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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A compliant cylindrical gas film seal has the potential to adapt to the complex operating conditions of a dual-rotor aeroengine, with radial runout and eccentricity, due to its special structural characteristics. To accurately investigate the seal performance of a compliant cylindrical gas film seal on dual-rotor shafts, an aeroelastic coupling method is proposed. This method analyzes the performance of a compliant cylindrical intershaft gas film seal by taking the centrifugal expansion effect into consideration. The seal performance under homodromy and counter-rotating conditions, with and without the centrifugal expansion effect, is calculated, and various performance parameters are compared and analyzed. Furthermore, the influence mechanism of the direction of rotation of the two rotors on seal performance is revealed. The results show that seal performance under homodromy condition is greater than under counter-rotating condition, and for an aeroengine under homodromy condition, it is advantageous to apply the compliant cylindrical intershaft gas film seal. The effect of centrifugal expansion (in large-diameter and high-speed rotors) and rotor eccentricity on the performance of a compliant cylindrical intershaft gas film seal, as well as the impact of inner and outer rotor speed on leakage rate, are analyzed and presented in this study. The proposed aeroelastic coupling method provides a promising guidance for the performance analysis of the compliant cylindrical gas film seal in single and dual- rotor systems.

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Section: Verification Of Accuracysupporting

confidence: 80%

Section: Verification Of Accuracysupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An analysis method for the performance of compliant cylindrical intershaft gas film seal considering centrifugal expansion effect

Guo-qiang

Chen

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Relatively, there are few reports on the research of dual-rotor cylindrical gas film seal for aero-engines. Hou et al 23 analyzed the influence of geometric parameters and operating conditions on the leakage of the dual-rotor intershaft compliant cylindrical gas film seal.…”

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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Physics-Informed Deep Learning-Based Proof-of-Concept Study of a Novel Elastohydrodynamic Seal for Supercritical CO2 Turbomachinery

Lyathakula,

Cesmeci,

DeMond

et al. 2023

Journal of Energy Resources Technology

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Supercritical carbon dioxide (sCO2) power cycles show promising potential of higher plant efficiencies and power densities for a wide range of power generation applications such as fossil fuel power plants, nuclear power production, solar power, and geothermal power generation. sCO2 leakage through the turbomachinery has been one of the main concerns in such applications. To offer a potential solution, we propose an Elasto-Hydrodynamic (EHD) seal that can work at elevated pressures and temperatures with low leakage and minimal wear. The EHD seal has a very simple, sleeve-like structure, wrapping on the rotor with minimal initial clearance at µm levels. In this work, a proof-of-concept study for the proposed EHD seal was presented by using the simplified Reynolds equation and Lame's formula for the fluid flow in the clearance and for seal deformation, respectively. The set of nonlinear equations was solved by using both the conventional Prediction-Correction (PC) method and modern Physics-Informed Neural Network (PINN). It was shown that the physics-informed deep learning method provided good computational efficiency in resolving the steep pressure gradient in the clearance with good accuracy. The results showed that the leakage rates increased quadratically with working pressures and reached a steady state at high-pressure values of 15 ~ 20 MPa, where Q = 300 g/s at 20 MPa for an initial seal clearance of 255 µm. This indicates that the EHD seal could be tailored to become a potential solution to minimize the sCO2 discharge in power plants.

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Performance analysis of compliant cylindrical intershaft seal

Cited by 8 publications

References 24 publications

An analysis method for the performance of compliant cylindrical intershaft gas film seal considering centrifugal expansion effect

An analysis method for the performance of compliant cylindrical intershaft gas film seal considering centrifugal expansion effect

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

Physics-Informed Deep Learning-Based Proof-of-Concept Study of a Novel Elastohydrodynamic Seal for Supercritical CO2 Turbomachinery

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