Abstract
This paper describes an experimental investigation of threedimensional flow field development within contoured lobes similar to those employed in turbofan forced mixer nozzles and mixer-ejectors. Laser Doppler Velocimetry and total pressure loss measurements were performed on several lobe configurations in order to elucidate the underlying physics of the forced mixing flow process and to establish data sets suitable for the development of related computational fluid dynamic procedures. A principal result of this study is that the flows within forced mixers are predominantly inviscid, with boundary layer effects confined to lobe surface regions. Thus, the streamwise vortex array emanating from the trailing edge of such convoluted lobe surfaces is basically inviscid in origin.
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