涡流发生器对喷水推进进水管内流场影响数值研究

Numerical Study on the Influences of Vortex Generator on the Flow Field in aWaterjet Intake Duct

在某型喷水推进器进水管入水口前的船底平面上安装涡流发生器,控制进水管内流动分离,提升喷射泵的来流品质。采用雷诺时均模型和SST k-ω湍流模型数值模拟进水管内流场,从流动效率、分离程度和压力畸变三个方面对比了不同进速比下涡流发生器对进水管内流场的影响。结果表明:在全工况范围内,涡流发生器能够提升进水管的效率;在低进速比工况下,能有效抑制进水管斜坡侧的流动分离,减小总压畸变,提高出流的均匀性。

This paper investigates the effects of vortex generator (VG) on the flow separationcontrolin a submerged intake duct for a waterjet propulsion system to improve the flow uniformityentering the jet pump. VG is installed on the ship hull bottom in front of the intake entrance. Flow’sRANS equations are solved with the SST k-ω turbulence model to simulate the flow field inside theintake duct. The influences of vortex generator on the flow field characteristics of the intake ductare analyzed with respect to hydraulic efficiency, flow separation and pressure distortion. Resultsshow that the VG installation improves the intake efficiency over all operation conditions. The flowseparation on the ramp side is effectively restrained. The total pressure distortion is reduced toimprove the uniformity of the outlet flow.