The Recirculation Zone Characteristics of the Circular Transverse Jet in Crossflow

Ziwan Li, Yixiang Yuan, Baoting Guo, V. L. Varsegov and Jun Yao
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Ziwan Li: College of Jet Engines and Power Plants, Kazan National Research Technical University named after Tupolev, Kazan 420111, Russia
Yixiang Yuan: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Baoting Guo: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
V. L. Varsegov: College of Jet Engines and Power Plants, Kazan National Research Technical University named after Tupolev, Kazan 420111, Russia
Jun Yao: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2020, vol. 13, issue 12, 1-13

Abstract: Transverse jets in crossflow are widely used in energy systems, especially as dilution air jets, fuel/air mixers, and combustion equipment, and have received extensive attention and plenty of research. However, the studies of the circular transverse jet issued from a circular gap at the circumferential direction of a tube in crossflow are very limited. This paper studies a relatively new jet: the circular transverse jet. Firstly, numerical calculations are conducted under different turbulence models but with the same boundary conditions. By comparing the numerical results of different turbulence models with the existing experimental data, the turbulence model which is most suitable for the numerical calculation of the circular transverse jet is selected. Then, this turbulence model is used to calculate and analyze the flow field structure and its characteristics. It is found that due to the aerodynamic barrier effect of the high-velocity jet, a negative pressure zone is formed behind the jet trajectory; the existence of the negative pressure zone causes the formation of a vortex structure and a recirculation zone downstream the circular transverse jet; and the length/width ratio of the recirculation zone does not change with the changes of the crossflow and the jet parameters. It means that the recirculation zone is a fixed shape for a definite device. This would be fundamental references for the studying of fuel/air mixing characteristics and combustion efficiency when the circular transverse jet is used as a fuel/air mixer and stable combustion system.

Keywords: circular transverse jet; jet trajectory; recirculation zone; flow field structure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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