Two dimensional diffusers with plenum and tailpipe discharge.

Two dimensional diffusers, both with and without tailpipes, have been tested with different inlet boundary layer conditions and various diffuser geometries. The effect on the developing boundary layer parameters within the diffuser and tailpipe are investigated for the various conditions. The interaction of all these various parameters are investigated and their effects on the diffuser performance determined. A theoretical prediction technique based on the momentum integral equation and Head!s entrainment function is developed and the prediction method tested against the experimental results. This prediction technique was shown to accurately predict the boundary layer and performance parameters for thin inlet boundary layers and low area ratios.