Effect of various arrangements of triangular ledges on the performance of a 23 degree conical diffuser at subsonic Mach numbers

Jerome Persh, Bruce M. Bailey
naca-tn-3123
Jan 1954


A brief investigation has been made to determine whether the use of annular ledges to promote turbulent momentum exchange will improve the performance of a short, wide-angle diffuser. Results are presented of tests of a 23 degree conical diffuser with a 2:1 ratio of exit to inlet area with both rough and smooth triangular ledges, approximately one-tenth of the inlet boundary-layer thickness in height, installed in succession from the inlet to the exit.

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