Abstract
Experimental results for the flow around bluff bodies situated in a nozzle are reported in two parts: o (a) The influence of initial flow-boundary conditions on the characteristics of the mean flow field are given. The spatial distributions of reverse mass-flow rate and of the normalized wake boundary (σ/σ o =0) are presented as functions of bluff body blockage ratios in the range 0 to 0.54 and of forebody geometry. (b) The turbulence characteristics of the flow in the immediate wake of a “disc-in-nozzle” arrangement are given; for example, the spatial distributions of turbulent shear stress, turbulence intensities, and turbulence kinetic energy. These were determined using a new method of interpreting anemometer responses, developed for use in highly turbulent flows. When correlated with the mean flow characteristics, the turbulence measurements show that simple models of turbulence are inadequate for the evaluation of momentum exchange coefficients in highly turbulent flows. The correlation between the spatial distributions of mean stream function and local kinetic energy of turbulence, both calculated from measurement data, shows good agreement with that predicted for a similar flow system using the Prandtl-Kolmogorov model of turbulence.
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