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|Title: ||Study of the Wave Effects on Propeller Performance by Computations|
|Authors: ||C.Y. Hsin;C.T. Lin;C.P. Lee;C.C. Lin;Jiahn-Horng Chen|
|Issue Date: ||2018-06-29T02:24:26Z
|Abstract: ||Abstract:In this paper, the effects of ship motion on propeller performance are studied. The influences are divided into two different factors. The first one is the influence due to ship positions in seaway and the induced velocity due to wave itself, and the second one is the interaction between the ship hull and the propeller. The influence of the ship motion on the propeller performance is then the sum of these two factors, and they are assumed to be independent to each other in this research. In this paper, the first factor is considered as mainly the potential flow factor, and the second one is considered as mainly the viscous flow factor. For the effects of ship positions and the influence of wave itself, a potential flow propeller unsteady flow boundary element method is used with a ship motion prediction program for computations. For computing the interactions between the ship hull and propellers, the viscous flow RANS method is adopted. Instead of using the real propeller geometry in RANS computations, the body forces are used to represent the propeller effects, and it is called the body force method. In this paper, the ship motion computational method, the propeller boundary element method, and the viscous flow RANS method are integrated to evaluate the propeller performance in waves. The applications of the present method including speed loss, propeller effects on the ship wake, and wave effects on propeller performances are shown in the paper, and computational examples are demonstrated. For wave effects on propeller performances, we found that the effect of ship motion on propeller performance is obvious, and the unsteady flow computation example in the paper shows that the unsteady flow effect due to the ship wake is more important than that due to the ship motion.|
|Appears in Collections:||[系統工程暨造船學系] 期刊論文|
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