SWIRL IN AN S-DUCT OF TYPICAL AIR INTAKE PROPORTIONS.

Abstract

Results of measurement of the static pressure, total pressure and swirl in the flow through and S-shaped duct of typical air intake proportions mounted in a wind tunnel and tested at different incidences and different through-flow ratios are presented. Of the two methods used to reduce the magnitude of swirl as high incidence, the spoiler was the more powerful and could be sized either to reverse the swirl direction or to eliminate the swirl completely.