Abstract
An important requirement for the successful operation of the boundary-layer control (BLC) system for the quiet short-haul research airplane (QSRA) was to provide a source of pressurized airflow for BLC use. This was successfully achieved by 1) positioning a BLC inlet in the engine fan duct in a region of high local total pressure, and 2) carefully contouring the BLC inlet and duct. Potential flow with boundary layer analysis techniques was used as an aid to select the inlet and duct geometries. Airflow and total pressure profile test data were obtained. These data showed that the required total pressure of more than 99% of the average fan duct total presure was achieved.
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