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An Experimental Investigation of the Effect of Forward and Rearw
[USAAVLABS-TR]
$13.30

(Tech/propulsion/fan:USAAVLABS-TR-63-65) Thompson, Joe F. Jr.: An Experimental Investigation of the Effect of Forward and Rearward Motion on the Thrust of a Shrouded Propeller. Experimental evidence of the existence of a stagnation line between the leading and trailing edges on the outer surface of the shroud of a shrouded propeller in the static condition, in rearward motion, and in forward motion is presented. This stagnation line on the outer surface, which is a result of viscous interaction between the propeller slipstream and the external flow, causes a reduction in shroud circulation below that calculated by distributed singularities methods which assume a stagnation line at the trailing edge only. Shroud thrust decreases as the distance between this stagnation line and the trailing edge increases. It is shown that in rearward motion, such as is the case for a VTOL aircraft landing, the stagnation line moves forward from the vicinity of the trailing edge to the vicinity of the leading edge as vehicle speed increases. This forward movement of the stagnation line results in a significant loss in thrust, which can be correlated with the stagnation line location. Shroud pressure distribution, stagnation line location, and shroud thrust are presented for all three cases of motion at several propeller pitch angles, propeller rotational speeds, and vehicle linear speeds. It is shown that the flow pattern about the shroud is rather complicated in rearward motion, involving two coaxial ring-vortices surrounding the shroud. (Author), US Army Aviation Materiel Laboratories, Technical Reports. September, 1966. 95 pages. Paper master; price based on paper copy; see Options below for binding. Price: $13.30

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