Abstract
The Quasi-Continuous Method (QCM), originally applied to the steady planar thin wing problems, possesses advantages of both continuous and discrete loading methods. It has been successfully applied to steady propeller problems and in the work described here, is extended to unsteady propeller problems. First, explanations are made on unsteady two-dimensional wing problems for the evaluation of the validity of numerical methods and then a numerical procedure to solve unsteady propeller problems is described in detail. It is then shown that the fluctuating thrust of one blade and propeller vibratory shaft forces calculated by the present method agree well with experiments. A sample calculation is shown for pressure contours on a blade surface with varying angular position in a nonuniform flow.
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