Analysis of Face Deformation Effects on Gas Film Seal Performance

Zuk, J.

doi:10.1080/05698197308982732

Cited by 16 publications

(17 citation statements)

References 2 publications

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“…Axisymmetric loading: the seal ring face is subjected to some axisymmetric loading caused by the uniform pressure over some part of the body of the seal face. The distortion can either be divergent as shown in Numerous thermal-induced seal distortions [25,[64][65][66] are studied than the pressure-induced [66] distortion where thermal distortion is shown to be significant [65,66].…”

Section: Seal Gap Deformationmentioning

confidence: 99%

“…The supercritical CO2 Brayton power cycle offers the potential of higher cycle efficiency versus supercritical steam or superheated cycles at temperatures relevant for CSP plant applications [8,10,25,[28][29][30]. The advantages of a supercritical CO2 power cycle with respect to CSP plant applications can be summarized as follows [10]:…”

Section: Supercritical Co 2 Closed Loop Brayton Power Cyclementioning

confidence: 99%

“…The near wall modelling approach requires a fine mesh resolution. The first cell height should have a + close to unity in order to resolve the viscous sublayer [25,77,84,85]. Under certain conditions, a higher first cell + is acceptable, as long as it is within the viscous sublayer…”

Section: Near Wall Treatmentmentioning

confidence: 99%

“…The physical deformation can occur to the seal rings due to thermal, centrifugal, pressure, etc. that can alter the sealing gap size and result in coning of the sealing ring [17,25].…”

Section: Shaftmentioning

confidence: 99%

“…System control and transient analysis of supercritical CO2 loop has been the primary focus at Argonne National Laboratory (ANL), specifically for sodium-cooled reactors and Lead Fast Reactors [25,30,[36][37][38][39]. The turbo-expander and heat exchanger development has been a large focus at the Southwest Research Institute for supercritical CO2 for solar energy applications [11].…”

Section: IVmentioning

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: Seal Gap Deformationmentioning

confidence: 99%

Section: Supercritical Co 2 Closed Loop Brayton Power Cyclementioning

confidence: 99%

Section: Near Wall Treatmentmentioning

confidence: 99%

“…The physical deformation can occur to the seal rings due to thermal, centrifugal, pressure, etc. that can alter the sealing gap size and result in coning of the sealing ring [17,25].…”

Section: Shaftmentioning

confidence: 99%