The effects of clearance sizes on labyrinth brush seal leakage performance using a Reynolds-averaged Navier—Stokes solver and non-Darcian porous medium model

2009 ◽  
Vol 223 (8) ◽  
pp. 953-964 ◽  
Author(s):  
J Li ◽  
S Obi ◽  
Z Feng
Keyword(s):  
Porous Medium ◽  
Navier Stokes ◽  
Medium Model ◽  
Brush Seal ◽  
Reynolds Averaged Navier Stokes ◽  
Porous Medium Model

Effects of Clearances on the Leakage Flow Characteristics of Two Kinds of Brush Seals and Referenced Labyrinth Seal

2010 ◽  
Author(s):  
Jun Li ◽  
Yangzi Huang ◽  
Zhigang Li ◽  
Zhenping Feng ◽  
Hong Yang ◽  
...  
Keyword(s):  
Porous Medium ◽  
Flow Characteristics ◽  
Numerical Approach ◽  
Labyrinth Seal ◽  
Leakage Flow ◽  
Medium Model ◽  
Multi Stage ◽  
Brush Seal ◽  
Brush Seals ◽  
Porous Medium Model

Numerical investigations of leakage flow fields of two kinds of brush seals with four sealing clearances were conducted in this paper. The Reynolds-Averaged Navier-Stokes (RANS) and non-Darcian porous medium model solutions were applied as the numerical approach to analyze the flow characteristics of brush seal. The reliability and accuracy of the RANS and non-Darcian porous medium model for leakage flow in brush seals were established by comparison with the experimental data. The referenced labyrinth seal was changed into a multi-stage brush seal which has two configurations. One configuration had a traditional geometrical structure. The other had a shim structure installed between the front plate and brush bristle pack. The leakage flow rates of the brush seal with two different configurations were calculated for four bristle pack tip clearances (0mm, 0.1mm, 0.3mm, 0.5mm) which were compared with the results for the referenced labyrinth seal. The numerical results show that the leakage flow rate increases rapidly with the increasing of clearance between the bristle pack tip and the rotor surface for two kinds of brush seals. The sealing performance of the brush seal with shim structure is similar to that of the traditional design with the same sealing clearance and flow conditions. In addition, as compared with the traditional brush seal, the brush seal with shim structure can reduce the pressure difference between the bristle free and fence height at 0.3mm and 0.5mm sealing clearance. The leakage flow patterns in brush seals with two different configurations were also illustrated.

A Porous Medium Model of Alveolar Gas Diffusion

1999 ◽  
Vol 2 (3) ◽  
pp. 263-275 ◽  
Author(s):  
Vladimir Koulich ◽  
Jose L. Lage ◽  
Connie C. W. Hsia ◽  
Robert L. Johnson, Jr.
Keyword(s):  
Porous Medium ◽  
Gas Diffusion ◽  
Medium Model ◽  
Porous Medium Model

scholarly journals CFD modelling of an animal occupied zone using an anisotropic porous medium model with velocity depended resistance parameters

2021 ◽  
Vol 181 ◽  
pp. 105950
Author(s):  
E. Moustapha Doumbia ◽  
David Janke ◽  
Qianying Yi ◽  
Thomas Amon ◽  
Martin Kriegel ◽  
...  
Keyword(s):  
Porous Medium ◽  
Cfd Modelling ◽  
Medium Model ◽  
Anisotropic Porous Medium ◽  
Porous Medium Model ◽  
Occupied Zone

CFD Simulation and Optimization of Gas-Solid Phase Temperature of Isothermal Acetylene Hydrogenation Reactor

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
Guihua Hu ◽  
Zhencheng Ye ◽  
Wenli Du ◽  
Feng Qian
Keyword(s):  
Porous Medium ◽  
Solid Phase ◽  
Inlet Temperature ◽  
Acetylene Hydrogenation ◽  
Simulation And Optimization ◽  
Medium Model ◽  
Hydrogenation Reactor ◽  
Porous Medium Model ◽  
Two Temperature ◽  
Hydrogenation Selectivity

Abstract Gas-solid coupled heat transfer in an industrial isothermal acetylene hydrogenation reactor was carried out using computational fluid dynamics (CFD). A two-temperature porous medium model was established by adding source terms to energy equations of the solid and gas phases. The combination of a genetic algorithm with CFD methods is applied to optimization of the kinetic and process parameters of the reaction. The model was validated by comparing the simulated results with those obtained from a one-temperature porous medium model, a two-temperature porous medium model, and industrial data. The optimal hydrogen-to-acetylene ratio and inlet temperature are 1.78 and 326K, respectively. The optimized ethylene yield increase and hydrogenation selectivity are 0.53 % and 0.18 % higher than the values before optimization, respectively. Finally, the effects of the hydrogen-to-acetylene ratio and inlet temperature on the increase in ethylene yield and hydrogenation selectivity are analyzed. Therefore, the hydrogen-to-acetylene ratio and inlet temperature should be reasonably controlled during production.

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