A Thermohydrodynamic Analysis of Dry Gas Seals for High-Temperature Gas-Cooled Reactor

Wang, Hong; Zhu, Baoshan; Lin, Junyu; Changliu, Ye

doi:10.1115/1.4007807

Cited by 21 publications

(38 citation statements)

References 4 publications

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“…Some of the unidirectional groove geometries include the herringbone that that was used in the early work of Whipple [41], two part of spiral groove geometry patented by Shimizu [58], and the Rayleigh pad [59]. Today, the spiral groove dry gas seal is still the most widely used in mechanical seal applications today [23]. Therefore, it is the primary focus of the current work.…”

Section: Groove Stylesmentioning

confidence: 99%

“…The heat transfer coefficients on the dry gas seal [23], (a) heat transfer coefficients on the stationary wall (W1) and (b) heat transfer coefficients on rotating wall (W2).…”

Section: Conjugate Heat Transfer Simulation Of Dry Gas Sealmentioning

confidence: 99%

“…Some studies are available in the literature, which deal with the three dimensional Reynolds Averaged Navier Stroke equation in elucidating the flow field in the gap between two seal faces using ideal gas models [23,40,43,[50][51][52]. Heshune [43] investigated the distribution of the hydrodynamic gas film pressure, opening forces and leakage rate in the gap of the spiral grooved dry gas seals at different face clearances.…”

Section: Dry Gas Sealmentioning

confidence: 99%

“…Hong [23] performed a comprehensive analysis to resolve the problem of simulating the complex CHT within the seal. Qiu and Khonsari [40] presented a three-dimensional thermo-hydrodynamic CFD analysis to study the characteristics of an inward pumping spiral groove mechanical seal pair.…”

Section: Dry Gas Sealmentioning

confidence: 99%

“…Hong et al [23] performed a comprehensive three-dimensional simulations to resolve complicated CHT and gas film flow analysis for a spiral groove dry gas seal, using the commercial computational fluid dynamic software. The models used are shown in Figure 2.13.…”

Section: Conjugate Heat Transfer Simulation Of Dry Gas Sealmentioning

confidence: 99%

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Simulation and development of dry gas seal for supercritical CO2 carbon dioxide

Zakariya¹

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The supercritical CO 2 closed loop Brayton cycle operates at high pressure to achieve higher energy conversion efficiency. One of the important components in turbomachinery of the power cycle plant is the dry gas seals. Dry gas seals are gas-lubricated, mechanical, non-contacting, end-face seals, consisting of a mating (rotating) ring and a primary (stationary) ring. Low leakage dry gas seals are considered as a key enabling technology for achieving the improved thermodynamic cycle efficiency in the supercritical CO 2 power cycle. Alternate seal types, for example, labyrinth seals, suffers from high leakage. Even so there is a growing interest and importance of applying the small length scale dry gas seal in the small to medium scale supercritical closed loop Brayton cycle (1-20 MWe), there are still uncertainties for their operation at supercritical CO 2 conditions. These include the real gas effects near the critical points and the methods of minimizing the deformation of the supercritical CO 2 dry gas seal. In the supercritical region in the vicinity of the critical point (304 K, 7.4 MPa), CO 2 behaves as a real-gas, exhibiting significant and abrupt nonlinear changes in fluid and transport properties and high densities.Comprehensive analysis is performed to simulate the supercritical CO 2 dry gas seal. First, an isothermal simulation assuming rigid sealing ring walls in the gas film is performed using ANSYS Fluent to study the influences of real gas effect on performances of the dry gas seal. Then, conjugate heat transfer simulation is used to optimize the face geometry for a small to median scale supercritical closed loop Brayton cycle (1-20 MWe) using ANSYS Fluent. Finally, the pressure and the thermal outputs from the conjugate heat transfer analysis are used as boundary conditions for one way coupling fluid-structurethermal simulations using ANSYS Static Structural to study the effect of deformation of the sealing rings under applied pressure-loads, thermal-loads, and centrifugal effect.Finding from the simulation results shows, close to critical point the real gas effect is significant, whereas far from the critical point the supercritical fluid resembles an ideal gas. The centrifugal effect is enhanced by the higher density due to the real gas effects, causing a reduction of average pressure in the dam region hence reduces the opening force, and seal leakage.Increasing the groove radius decreases the opening force whereas increasing the spiral angle, increases the opening force. However, the variation is small for all tested cases studies with variation up to 6%. Increasing the groove radius decreases the leakage rate whereas increasing the spiral angle, increases the leakage rate. The variation in changing groove radius is more significant than the spiral angles. The variation in leakage iii is up to 29.2% for all tested cases. In term of the film stiffness, there is no clear pattern when changing the groove radius but the impact of the spiral angle is significant, up to 46.6% for all tested c...

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Section: Groove Stylesmentioning

confidence: 99%

“…The heat transfer coefficients on the dry gas seal [23], (a) heat transfer coefficients on the stationary wall (W1) and (b) heat transfer coefficients on rotating wall (W2).…”

Section: Conjugate Heat Transfer Simulation Of Dry Gas Sealmentioning

confidence: 99%