Theoretical investigation of static coefficients, stability derivatives, and interference for ducted propellers.
31 Mar 1964-
About: The article was published on 1964-03-31 and is currently open access. It has received 2 citations till now. The article focuses on the topics: Stability derivatives.
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01 Sep 1966
TL;DR: In this paper, the performance of two full-scale ducted propellers at angle of attack was evaluated. And the authors developed a model for the performance prediction and measured performance of these propellers.
Abstract: Predicted and measured performance of two full- scale ducted propellers at angle of attack - analytical model development
13 citations
TL;DR: In this paper, the static force and moment coefficients at angle of attack and their dynamic pitching derivatives are given for an isolated ducted propeller, based on a potential flow analysis that is based upon Fourier expansion of the vorticity distribution.
Abstract: In the present paper the static force and moment coefficients at angle of attack and their dynamic pitching derivatives are given for an isolated ducted propeller. These result from a potential flow analysis that is based upon Fourier expansion of the vorticity distribution. The analysis offers a valid technique for combining existing theory for ring wings at angle of attack and ducted propellers in axial flow. The propeller is represented as a uniformly loaded actuator disk, and the effects of duct chord-to-diameter ratio, circular arc camber, taper, and thickness are shown for the duct coefficients and their pitching derivatives. The details of the mathematical development appear in the comprehensive Vidya Technical Report 112. The static coefficients reduce to those previously obtained by Burrgraf for a short, thin, cylindrical duct and uniform actuator disk; and when both the actuator disk loading and freestream angle of attack become small, the coefficients reduce to those obtained by Weissinger for a ring wing. The new results consist of the static coefficients and the dynamic pitching derivatives for a duct with camber, taper, thickness, and increased chord.
10 citations