A METHOD FOR GUIDING EFFLUX AIR FROM A FAN-IN-WING MODEL INTO A DISCHARGE DUCT.
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF MECHANICAL ENGINEERING
Pagination or Media Count:
A scheme is described by means of which the 12-inch fan-in-wing model was separated from a mechanically connected efflux-removing duct. The modifications that were introduced included a slotted bellmouth inlet, which served as a catch-flow entrance below the air gap, and a diffuser at the exit of the ducting system, which corrected the static pressure level in the duct for transmission of the full efflux flow. The modifications were intended to facilitate mechanical isolation of the model so that direct lift measurements could be made while the efflux air was removed with essentially zero ground effect. Author