Increasing the Pollutants Capture Rate by Local Exhaust Due to the Use of External Swirling Jet. Part 1. Research Methods

• Published in: Refractories and industrial ceramics 2022-09, Vol.63 (3), p.332-336
• Main Authors: Zaitsev, O. N., Logachev, K. I., Gol’tsov, A. B.
• Format: Article
• Language: English
• Subjects: Air flow; Analysis; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Design parameters; Ecology; Environmental aspects; Exhaust systems; Flow velocity; Glass; Materials Science; Methods; Natural Materials; Pollutants; Swirling; System effectiveness; Vortices
• ISSN: 1083-4877; 1573-9139
• DOI: 10.1007/s11148-022-00731-8

To capture pollutants in various buildings and structures, it is necessary to use local exhaust systems. One of the criteria of the local exhaust efficiency, the pollutants capture rate, is proposed to be increased due to the impact of a swirling annular jet and the occurrence of a reverse air flow. The circular exhaust is placed coaxially into the external cylindrical casing, in which the air flow is swirled due to the tangential supply of two supply jets into the casing. A vortex dome, which helps to increase the efficiency of such a vortex exhaust, is formed. The change in the axial air velocity with distance from the vortex exhaust was experimentally and numerically investigated for 11 structures, in each of which 4 different ratios of exhaust and supply air flow rates were set. In the investigated options of using the proposed exhaust systems, the velocity increases significantly at a certain range of distances from them. Acombination of design and operation mode parameters that contribute to the highest capture rate by vortex exhaust is determined. The results obtained are useful in designing effective exhaust systems to capture pollutants.