Two-Dimensional,Incompressible,Turbulent Curved-Wall Jets,

摘要

When a jet flows adjacent to a solid boundary,it tends to attach itself and flow along the surface. A theoretical and experimental study of the effects of the surface curvature on the flow field of a two-dimensional,incompressible,turbulent jet has been made. By using a perturbation technique,the governing equations for the flow have been obtained and solved numerically. There is flow similarity for a curved-wall jet when m = 1,and for the flow of a plane wall jet when the curvature approaches infinity. Two spiral and three circular cylindrical surfaces were tested. The mean velocity profiles and static pressure distributions were measured at various stations for each surface. In addition,the point of separation was found for Reynolds numbers,based on the nozzle width,in the range of 500to 4000. The growth rates of the jet width and the rate of decay of the maximum velocity were deduced from the velocity measurements. (Modified author abstract)