Water jet propulsion device, and, the water jet propulsion boat

摘要

PROBLEM TO BE SOLVED: To provide a waterjet propeller and a waterjet propulsion ship capable of improving operation performance, by further uniformizing a water flow.;SOLUTION: The waterjet propulsion ship comprises a suction pipeline 2 having a bending part of changing the extension direction in the middle and introducing water W from a hull external part into an impeller and a first guide vane 5 provided in the suction pipeline 2 on the upstream side of the bending part, and the first guide vane 5 is provided in a rear side area in the rotational direction R of the impeller more than a boundary line L of extending toward the bending center direction side of the bending part of the suction pipeline 2 more than the axis and also toward the bending center direction side from the axis, in a cross section orthogonal to the axis of the suction pipeline 2, and is also provided so as to increase the cross-sectional area orthogonal to the axis in a first flow passage C1 between the first guide vane 5 and a wall surface of the suction pipeline 2 toward the downstream side on the bending center direction side of the bending part.;COPYRIGHT: (C)2015,JPO&INPIT