Near-field mixing characteristics of turbulent jet issuing from a notched-rectangular orifice plate
This paper reports an experimental investigation of the near-field mixing characteristics of a turbulent jet issuing from a notched-rectangular orifice plate. Planar particle image velocimetry (PIV) was used for measurements of the velocity field with the exit Reynolds number =72,000. Comparison is made of the results for this jet and its circular countpart obtained under the identical conditions. Consistent with previous investigations of other noncircular jets, the notched jet has an overall superior mixing capability over the circular jet. This is re ected by a shorter potential core and higher decay and spread rates of the jet. Also, the axis switching occurs in this jet. Of particular interest, the notched jet entrains the surroundings immediately downstream from the nozzle at a much higher rate than do the circular and other noncircular jets.
turbulent jet mixing characteristics noncircular nozzle
J.Mi P.Kalt G.J.Nathan
College of Engineering, Peking University, Beijing 1000871, China;School of Mechanical Engineering, School of Mechanical Engineering, The University of Adelaide, South Australia 5005, Australia
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）