Numerical study of the effect of the helium-based multi-component gas mixture on the internal purifier

The subject of research is a gas-dynamic process of mixture formation with a given component mass fraction during overflow through the mixer nozzles in the mixture generation system. The aim of the study is the scientific and experimental evaluation of the mixer technical solutions to ensure the accuracy and homogeneity of the gas mixture. The current work conducts numerical study on the flow of a gas flow through the mixer nozzles of the mixture generation system, ensuring its stoichiometric component composition and homogeneity. The problem is solved by developing adequate mathematical models of gas-dynamic flow and analyzing the results of numerical simulations. The following results were obtained. A mixer with the nozzles in the mixture generation system has been created and a technical solution for its design has been scientifically substantiated. The areas of flow sections of mixer nozzles are experimentally established. A mathematical model of generating a mixture with a given component mass fraction was developed and a series of numerical experiments was conducted to study its overflow through the mixer. A 3D simulation was conducted using ANSYS CFX software. The stationary formulation of the problem is applied. In the nozzles of closed overflow of the mixer, the heat exchange of the gas flow with the walls is taken into account by solving a separate problem and determining the corresponding heat transfer coefficients. At the inputs to the mixer, the ratio of the initial pressure of the components of the mixture is determined, which ensures its stoichiometric composition. The fields of the gas flow velocities, the mass flow rate of the components of the gas mixture through the mixer, and pressure and temperature fields are obtained. Based on the simulation results, it was found that the design of the developed mixer ensures the creation of a gas mixture with a homogeneity of at least 3%. With a constant pressure ratio of the mixture components to the mixer inlet, the gas mixturedosing accuracy can be achieved at least 1%.

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Numerical Study on the Premixed Combustion in Porous Media Burner

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.614-615.73 ◽

2012 ◽

Vol 614-615 ◽

pp. 73-76 ◽

Cited By ~ 2

Author(s):

Jin Yan Zhang ◽

Hong Sheng Liu ◽

Zhen Jie Xu

Keyword(s):

Porous Media ◽

Equivalence Ratio ◽

Numerical Study ◽

Gaseous Mixture ◽

Packed Bed ◽

Discrete Ordinates ◽

Gas Mixture ◽

Inlet Velocity ◽

Fluent Software ◽

Porous Media Burner

The phenomenon of combustion of a gaseous mixture in a two-dimension alumina ( ) particle packed bed porous media burner is studied by means of a numerical simulation with FLUENT software using two-step reaction mechanism. The Eddy-dissipation-concept (EDC) model, the standard model and the Discrete- Ordinates (DO) radiation model are used in this paper. It is concluded that the methane/air gas mixture with lower equivalence ratio or with faster inlet velocity, can achieve the faster wave propagates. The methane/air gas mixture with lower equivalence ratio or with faster inlet velocity, can achieve the faster wave propagates.

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