Titlebook: Elements of hydrodynamicp propulsion; J. A. Sparenberg Book 1984 Martinus Nijhoff Publishers, The Hague 1984 Profil.actuator.display.distr

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Unsteady propulsion,e one seems to be: a propeller is unsteady when no inertial reference frame exists with respect to which the induced flow is time independent. This however is not appropriate because then nearly all conceivable propulsion systems are unsteady with the only exception probably of the sails of a yacht

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Optimization theory,ribed force action. We assume the fluid to be inviscid and incompressible. First we have to define what will be called the best way of working of a device. We restrict ourselves to the minimization of a simple cost function, namely the kinetic energy losses per unit of time.

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Book 1984enerally based on lift producing profiles. We assume the fluid, which is admitted in conventional hydrody­ namics, to be incompressible. Further we assume the occurring Reynolds numbers to be sufficiently high such that the inertia forces dominate by far the viscous forces, therefore we take the flu

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