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Numerical flow simulation of flush type intake duct of waterjet

机译：射流冲洗式进水管的数值流模拟

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Waterjet propulsion system is widely used to thrust high speed marine vessels in excess of 30-35 knots by virtue of high propulsive efficiency, good maneuverability, and less vibration. Since, however, approximately 7-9% of the total power is lost in intake duct due to flow separation, nonuniformity, etc., detail understanding of flow phenomena occurring within intake duct is essential to reduce the power loss. The present work solved 3D incompressible RANS equations on multiblocked grid system of the flush type intake duct of waterjet. The numerical results of surface pressure distributions, velocity vectors, and streamlines were compared with experiments and good agreements were obtained for three jet velocity ratios. Strong suction flow through the inlet was shown and the vortex induced by the separation along the corner of the side wall was clearly shown. Flow separation on the lip was also observed. The location of stagnation point on the lip was well predicted, in accordance with PIV measurement.
机译：水射流推进系统以其高推进效率，良好的机动性和较小的振动而被广泛用于以超过30-35节的速度推进高速船舶。然而，由于由于流动分离，不均匀等原因，在进气管道中损失了大约7-9％的总功率，因此，详细了解进气管道中发生的流动现象对于减少功率损失至关重要。本工作解决了水刀冲洗式进气道的多块网格系统上的3D不可压缩RANS方程。将表面压力分布，速度矢量和流线的数值结果与实验进行了比较，并获得了三种喷射速度比的良好一致性。示出了穿过入口的强吸力流，并且清楚地示出了由沿着侧壁的角的分离引起的涡流。还观察到嘴唇上的流动分离。根据PIV测量，可以很好地预测嘴唇上的停滞点的位置。

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