Abstract
The authors showed a method of calculating the hydrodynamic characteristics of the Axisymetrical Nozzle Propeller (hereinafter to abreviated to A. N. P.) in an Axisymetrical Flow (A. F.) and made calculations about the open characteristics and the velocity field in a Uniform Flow (U. F.). From some comparison with experimental results, they showed that the method is considerably effective for grasping open characteristics of the Nozzle Propeller (N. P.).Until now, the number of actual ships installed with N. P. increased and so the comparison with N. P. ships and C. P. (Conventional Propeller) ships has been made on both model and actual ships. From these results it has been made clearer that the difference of characteristics of open and behind condition in case of N. P. is larger than that in case of C. P.. The factors may be as follows; At first, in case of C. P., thrust is distsibuted over the propeller disc and so the performance is mainly decided by the mean flow velocity. On the other hand, in case of N. P., thrust is divided into two parts due to the impeller and the ring and the performance of nozzle is strongly affected by the local wake distribution in the vicinity of the nozzle. As the second reason, suction effect of N. P. being stronger than that of C.P., N.P. characteristics, especially Nozzle Thrust is affected by the deformation of nominal wake. From the abovementioned points of view, it is very important to investigate about N. P. characteristics in each step of Uniform, Axisymetrical and Non-Axisymetrical Flow, taking some consideration about the deformation of nominal wake.In this second report, they showed a method of calculation of a Non-Axisymetical Nozzle Propeller (N. A. N. P.) in a Non-Axisymetical Flow (N. A. F.) and made som study about flow field and pressure around N.P. in U.F., A.F. and N.A.F., using the calculating method based on both the 1st and the 2 nd reports and experimental method.
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