This paper is aimed at presenting an up-to-date investigation of the hydrodynamics of the jet (wake) of a stationary, unconfined ship's propeller. The velocity field of a ship's propeller jet is of particular interest for the researchers investigating the jet induced damage on a seabed as documented in previous studies. This paper discusses the time-averaged velocity field at the efflux, which is the immediate exit of the downstream propeller jet. The propeller jet is a rotating flow, which has axial, tangential and radial components of velocity. The axial component of velocity is the main contributor to the total velocity magnitude. Researchers are more interested in the axial velocity field within the ship's propeller jet, due to the large contribution made by the axial velocity to the jet. The axial velocities at the efflux plane were obtained using joint experimental and numerical approaches. The results confirmed the two-peaked ridges axial velocity profile and disagreed with the 0.707Dp contraction suggested by Blaauw & van de Kaa (1978), Verhey (1983) and Robakiewicz (1987) at efflux of a ship's propeller jet.
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机译：本文旨在提供对固定无限制船舶螺旋桨射流（尾流）流体动力学的最新研究。研究人员对喷气螺旋桨的速度场进行了特别的研究，如先前研究中所记录的那样，该研究人员研究了喷气螺旋桨对海底造成的损害。本文讨论了外排时的平均速度场，它是下游螺旋桨射流的直接出口。螺旋桨射流是旋转流，具有轴向，切向和径向速度分量。速度的轴向分量是总速度大小的主要贡献者。研究人员对船舶螺旋桨射流内的轴向速度场更感兴趣，因为轴向速度对射流有很大的贡献。使用联合实验和数值方法获得外排平面上的轴向速度。结果证实了两峰脊的轴向速度分布，并且与Blaauw＆van de Kaa（1978），Verhey（1983）和Robakiewicz（1987）在船用螺旋桨喷射时提出的0.707Dp收缩不同。
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