413 / 2018-12-26 09:51:58

Influence of Split Blade Geometric Parameters on the hydrodynamic Performance of Water-jet Propulsion System

high-speed propulsion system; inlet runner; splitter blade; CFD; leading edge

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The intake duct is an important part of the high-speed water-jet propulsion system, and its design is directly related to the cruising ability and maneuverability of the vessels and underwater vehicles. In this paper, a water-jet intake duct with six circumferentially distributed splitter blades is designed and its internal flow is numerically investigated by solving Reynolds-Average Navier-Stokes with RNG k-Epsilon turbulence model. Different geometrical parameters, including the ellipse ratio, the thickness, the distance between leading edge and inlet length and the forward-swept angle of the leading edge of blades are studied. The influence of the aboved geometrical parameters on the flow characteristics of the intake duct are discussed at the inlet velocity ratio IVR = 0.77, and five indicators, being flow separation degree, vorticity, outlet flow nonuniformity, massflow and total pressure loss coefficient, are qualitatively and quantitatively provided to assess the hydrodynamic performance of the designed intake duct. The result shows that the integrated hydrodynamic performance of the water-jet intake duct is excellent when the elliptic ratio of the leading edge of the blade is 0.2, the thickness of the leading edge is 50mm, the distance between leading edge and inlet length is 48.2mm and the forward-swept angle of the leading edge is 10°. The design can effectively suppress the vortex generation and flow separation near the leading edge. After optimization, the outlet flow nonuniformity at the duct outlet is reduced by 18.3％, the flow coefficient is increased by 0.42％, and the total pressure loss coefficient is reduced by 0.57%. The current work provides a theoretical guidance for the hydrodynamic performance improvement of the water-jet propulsion system.