Book Description

As part of a general investigation of two-stream supersonic diffusers, a theory was developed for the bounded turbulent mixing between coaxial high velocity streams of different composition and temperature. The usual assumption of negligible axial pressure gradient is invalid in this case because the outer stream is bounded by a cylindrical duct. A highly simplified flow model is used which retains the essential features of the actual mixing process; the resulting system of equations is amenable to manual calculation. The theory is correlated with data obtained from an annular nozzle wind tunnel having a central supersonic core of rocket exhaust gases. Correlation is also made with Mikhail's low velocity data for which his more elaborate theory is available for comparison. The simplified theory predicts with reasonable accuracy the experimental axial static pressure and velocity distributions. (Author).