Abstract
The properties and advantages of axial flow cyclones are presented; several dozen of them are already widely used as the first stage of inlet air filtration in internal combustion motor vehicle engines, work machines and helicopters. The necessity to conduct research on cyclones to improve separation efficiency has been demonstrated. Using the commercial engineering software Ansys Fluent, at a constant inlet velocity of 10 m/s, an assessment was made on the effect of the separation length and inlet diameter of the outlet tube on changes in separation efficiency in axial flow cyclone. Each of the examined parameters was variable while maintaining other factors at a constant level. In the numerical calculations, test dust was used, which was the equivalent of AC fine dust, the particle size composition of which was taken into account using the Rosin–Rammler model. Increase in the separation efficiency was observed with an increase in the separation length and a decrease in the diameter of the cyclone inlet tube. For the cyclone model with an increased separation length and reduced diameter of the inlet pipe, numerical tests of separation efficiency and pressure drop were performed for various velocities at cyclone inlet in the range of 2.5–15 m/s. The obtained characteristics of modified axial flow cyclone were experimentally verified on a laboratory stand during cyclone prototype tests, the model of which was printed using the additive manufacturing technique.
Highlights
A cyclone, known as a cyclone separator, is a device for separating solid particles from gas, and uses for this purpose the centrifugal force acting on a particle produced by the swirling gas
This paper presents the possibilities of modifying the structure of axial flow cyclone in the direction of increasing separation efficiency understood as an increase in efficiency or a decrease in pressure drop
Using the commercial engineering software Ansys Fluent, a numerical evaluation of influence of three parameters of this cyclone: separation length lm, internal diameter of the outlet tube dw and length of the vortex core lr on separation efficiency and pressure drop was performed
Summary
A cyclone, known as a cyclone separator, is a device for separating solid particles from gas, and uses for this purpose the centrifugal force acting on a particle produced by the swirling gas. Klujszo et al [57] carried out a numerical study of the influence of different designs of the swirl blades, the diameter of the swirler and the diameter of the core, the width of the collecting chamber gap and the distance of the swirler from the outlet pipe inlet on the efficiency and flow resistance of axial-flow cyclone. Mao et al [60] presented a study of the influence of three parameters of axial-flow cyclone: the shape of the steering wheel, the angle of the blades0 outlet and the diameter of the guide cone on separation efficiency and pressure drop. In order to partially fill the gap in this respect, the authors developed a model of a axial-flow cyclone and performed its research on the impact of the separation length of the cyclone, the internal diameter of the outlet pipe and the length of the swirl core on the efficiency and pressure drop. The measures taken aimed at improving the efficiency and filtration accuracy while maintaining a low pressure drop of the cyclone
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