Experiments on a Two-Dimensional Impinging Jet on a Wedge : Turbulence Properties and the Energy Balance

抄録

Turbulence properties and the balance of turbulence energy in a two-dimensional impinging jet on a wedge are investigated. The angles between the wedge surface and the jet axis φ are 30°and 45°. The profiles of u'/U_m, v'/U_m and (<q²>^^^-)/(2Um²) in the fully developed flow region are larger than those of the two-dimensional wall jet, but the profile of w'/U_m is almost the same as that of the two-dimensional wall jet, and all profiles exhibit no similarity. Each term of the production, dissipation and diffusion in the turbulence energy equation is larger than that of the two-dimensional wall jet except for the advection term. The production and the diffusion terms in the case of φ=45°are larger than those in the case of φ=30°. The pattern of the isopleths of (<q²>^^^-)/(2U²_j) in the impinging region differs for each case of φ=30°and 45°.