Abstract
In order to investigate the distribution characteristics of gas-particle two-phase flow in the diesel particulate filter in the capture process, a mathematical model of gas-particle two-phase flow for inside-and-outside filter had been established in the capture process according to the mass conservation equation, momentum conservation equation, and k-ε turbulence equation. The model verification was carried out with the experimental and simulated of flow distribution characteristics of gas-particle two-phase. The obtained results showed that the static pressure gradient along the radial distribution was greater at the inlet of the filter in capture process in the diesel particulate filter, which could easily lead to causing eventual fatigue damage due to stress concentration in the front-end of filter; moreover, the weaker the vortex strength of gas-particle formed in expansion pipe was, the better uniformity of flow velocity and soot concentration distribution were. Therefore, the established mathematical model can be used for predicting gas-particle flow velocity distribution in the diesel particulate filter.
Highlights
It is well known that a critical factor in the city’s pollution is the exhaust pollution [1,2,3]
Utilization ratio, regeneration cycle length, and service life of the filter in the diesel particulate filter are determined by the distribution characteristics of the particle flow [23], especially the uniformity distribution characteristics of the flow velocity and the soot concentration in the diesel particulate filter [24]
It is due to the fact that exhaust gas of the diesel engine is discharged in the pulse form accompanied by intense pressure fluctuation, accumulation of the soot particles will affect the measurement of flow velocity in the experimental process
Summary
It is well known that a critical factor in the city’s pollution is the exhaust pollution [1,2,3]. The emission, especially the particle matter from the diesel engine, is the main source of air pollution [4, 5], which seriously affects people’s physical and mental health and quality of life, and hinders the sustainable development of the city [6,7,8]. International Journal of Aerospace Engineering difficult to obtain the spatial distribution of continuous particle velocity and concentration and a great deal of calculation is needed in pseudo particle model because that particle-phase and gas-phase are separated [26]. The calculation and analysis show that distribution characteristics of the flow velocity and the soot concentration are obtained, which will provide important theoretical basis for optimizing and designing new-type diesel particulate filter device and controlling of the regeneration process
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