Near field vorticity distributions from a sharp-edged rectangular jet |
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| Institution: | 1. Mechanical Engineering and Aeronautics Department, University of Patras, 26504 Patras, Greece;2. Department of Mechanical and Materials Engineering, Queen’s University, Kingston, K7L-3N6 Ontario, Canada;1. Department of Mechanical & Aerospace Engineering, Jett Hall 110, MSC 3450, New Mexico State University, Las Cruces, NM 88003, United States;2. State Key Laboratory of High Temperature Gas Dynamics, No. 15 Beisihuanxi Road, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. Agency for Defense Development, Daejeon, 34060, Republic of Korea;2. School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, 10540, Republic of Korea;1. Department of Mechanical Engineering, Chungnam National University, Daejeon 305-764, South Korea;2. Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, South Korea;1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China;2. National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing, 400074, China;3. Key Laboratory of Navigation Structure Construction Technology, Ministry of Transport, Nanjing Hydraulic Research Institute, Nanjing, 210029, China;4. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China |
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| Abstract: | Experimental results on the near field development of a free rectangular jet with aspect ratio 10 are presented. The jet issues from a sharp-edged orifice attached to a rectangular settling chamber at Reh ～ 23,000, based on slot width, h. Measurements on cross plane grids were obtained with a two-component hot wire anemometry probe, which provided information on the three dimensional characteristics of the flow field. Two key features of this type of jet are mean axial velocity profiles presenting two off axis peaks, commonly mentioned as saddleback profiles, and a predominant dumbbell shape as described by, for example, a contour of the axial mean velocity. The saddleback shape is found to be significantly influenced by the vorticity distribution in the transverse plane of the jet, while the dumbbell is traced to two terms in the axial mean vorticity transport equation that diffuse fluid from the centre of the jet towards its periphery. At the farthest location where measurements were taken, 30 slot widths from the jet exit, the flow field resembles that of an axisymmetric jet. |
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| Keywords: | Turbulence Rectangular jet Sharp edges Saddle back profiles Vorticity |
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