A Numerical Study of Air Jet Impinging on a Cone
In this paper, numerical simulation study on characteristics of air jets flowed on cone was carried out, which mainly focused on the effects of cone vertex angles on airflow pattern. If the cone vertex angle is larger than the top value of a certain range of angles, the air jet will deflect up relative to the generation of cone. If the cone vertex angle is less than the bottom value of the range of angles, it will deflect down. The certain range of cone vertex angles was defined as critical angles in the paper. The study was conducted on two kinds of boundary conditions, one was confined jet which flowed out from the inlet located on ceiling and the other was free jet which flowed out from the inlet located in free space. For the confined jet, the cone vertex angles in range of 90°～120°were considered, and for the free jet, the angles in range of 130°～170°.The standard κ-ε model of FLUENT was applied to solve in this study, and the near wall treatment was non-equilibrium wall function. The results showed that the critical angles were 101°～102°for confined boundary condition, and 160°～170°for free boundary condition. Furthermore, if the cone vertex angle was larger than the top value of the range of angles, the air jet deflected up, and if the cone vertex angle was smaller than the bottom value of the range of angles, the jet deflected down. The critical angles of cone were consistent with the Awbis suggestion“the circular ceiling diffuser should not bigger than 120°, under the confined boundary condition.
Air jet Numerical study FLUENT Cone vertez angles critical angles
Jingye Zhao Jinghui Chang
School of Environment and Energy Engineering,Beijing University Of Civil Engineering and Architecture,Beijing,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
2032-2038
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）