Study on Characteristics of Gas Flow in Catalytic Converter with Different Outlet Diameters

. This paper studies the different diameters of tube outlet how to affect the gas flow pressure and velocity distribution in nanofiber catalytic converter by CFD (Computational Fluid Dynamics) method. Geometric model of the catalytic converter has been established and meshed by the pre-processing tool of FLUENT. The distribution of velocity and pressure in the converter which outlet diameter is 70 mm is more evenly than the converter which outlet diameter is 50 mm. It is conducive to reducing airflow static pressure in the catalytic converter that expanding the outlet diameter in the case of other conditions remains unchanged. Therefore, the larger outlet diameter is beneficial to exhaust catalytic reaction.

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Study on Characteristics of Gas Flow Pressure in Catalytic Converter with Porous

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.235.30 ◽

2012 ◽

Vol 235 ◽

pp. 30-33

Author(s):

Zhan Jun Cai ◽

Wei Min Kang ◽

Bo Wen Cheng ◽

Ya Bin Li

Keyword(s):

Porous Material ◽

Gas Flow ◽

Static Pressure ◽

Pressure Field ◽

Fiber Diameter ◽

Catalytic Converter ◽

Geometric Model ◽

Center Line ◽

Static Pressure Distribution ◽

Flow Pressure

This paper studies the different porosity of porous medium how to affect the flow pressure field under the conditions of same inlet velocity and fiber diameter by CFDmethod. Geometric model of the catalytic converter has been established and meshed by the pre-processing tool of FLUENT. The flow pressure simulation filled contours and the curve of center line static pressure distribution of the fiber porous material show that in the case of other conditions remain unchanged, the less the porosity of the fiber porous material, the higher the inlet pressure and the more the pressure loss of the porous material. The more porosity of fiber is beneficial to exhaust catalytic reaction.

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Research on dynamic characteristics of gas film of spherical hybrid gas bearings based on computational fluid dynamics

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2018-0134 ◽

2020 ◽

Vol 44 (1) ◽

pp. 23-37

Author(s):

Chenhui Jia ◽

Zhiwu Cui ◽

Shijun Guo ◽

Wensuo Ma

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Flow Field ◽

Bearing Capacity ◽

Dynamic Characteristic ◽

Dynamic Characteristics ◽

Gas Flow ◽

Static Pressure ◽

Gas Bearings ◽

Gas Bearing

A realizable k–ε turbulence model for spherical spiral groove hybrid gas bearing films was established based on computational fluid dynamics (CFD). A six degrees of freedom passive grid was used to calculate the gas film pressure distribution, bearing capacity, and dynamic characteristic coefficients numerically. The gas flow field dynamic and static pressure coupling mechanism was studied. The effects of the rotation speed, gas film thickness eccentricity ratio, and gas supply pressure on the dynamic and static pressure bearing capacity, and dynamic characteristic coefficients during operation were analyzed as a method of research into the mechanical mechanisms of gas bearing stability. The CFD calculation analysis can simulate the complex gas flow in the transient flow field of the gas film and determine reasonable operation parameters to optimize the dynamic and static pressure coupling effects, which can improve the gas film bearing capacity, dynamic characteristics, and operational stability of gas bearings.

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Rotor hover performance prediction using a free-wake, computational fluid dynamics method

Journal of Aircraft ◽

10.2514/3.45887 ◽

1989 ◽

Vol 26 (12) ◽

pp. 1105-1110 ◽

Cited By ~ 23

Author(s):

K. Ramachandran ◽

C. Tung ◽

F. X. Caradonna

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Performance Prediction ◽

Hover Performance ◽

Free Wake ◽

Dynamics Method

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The Effect of Different Turbulence Models on the Emitter Discharge by Using Computational Fluid Dynamics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.662.586 ◽

2013 ◽

Vol 662 ◽

pp. 586-590

Author(s):

Gang Lu ◽

Qing Song Yan ◽

Bai Ping Lu ◽

Shuai Xu ◽

Kang Li

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Flow Field ◽

Turbulence Models ◽

Experimental Results ◽

Turbulent Model ◽

Simulation Results ◽

Rsm Model ◽

Dynamics Method ◽

Emitter Discharge

Four types of Super Typhoon drip emitter with trapezoidal channel were selected out for the investigation of the flow field of the channel, and the CFD (Computational Fluid Dynamics) method was applied to simulate the micro-field inside the channel. The simulation results showed that the emitter discharge of different turbulent model is 4%-14% bigger than that of the experimental results, the average discharge deviation of κ-ω and RSM model is 5, 4.5 respectively, but the solving efficiency of the κ-ω model is obviously higher than that of the RSM model.

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