The invention discloses a noise reduction guide pipe suitable for a pump-jet propeller and the pump-jet propeller, and belongs to the field of pump-jet propellers. The tail edge of the guide pipe is made of gradient porous medium materials, and the gradient porous medium materials are composed of a plurality of pore units. Each pore unit is of a hollow three-dimensional structure, a cavity is formed in each pore unit, and a plurality of through holes are formed in the peripheral surface of each pore unit, so that the adjacent pore units are communicated with each other to form a porous medium material of which the inner wall surface and the outer wall surface of the tail edge are communicated and are communicated with a flow field environment; the tail edge is divided into a plurality of porosity sections in the axial direction of the guide pipe, and the porosity of each section is changed in a gradient mode in the chordwise direction. Through the gradient porous medium material, the instability of a shear layer under a high Reynolds number is reduced, a wake flow area is expanded, rolling or vortex falling of the shear layer is delayed, and fluctuation of lift resistance of the surface of a structure is reduced, so that flow noise is reduced, and the invisibility of an underwater vehicle is improved.
本发明一种适用于泵喷推进器的降噪导管及泵喷推进器,属于泵喷推进器领域;所述导管的尾缘为梯度多孔介质材料,所述梯度多孔介质材料由若干孔隙单元构成;所述孔隙单元为镂空的立体结构,其内为空腔,外周面上开有多个通孔,使得相邻孔隙单元之间相互连通,构成尾缘内外壁面相通并与所处流场环境连通的多孔介质材料;所述尾缘沿导管的轴向分为多个孔隙率段,各段的孔隙率沿弦向呈梯度变化。本发明通过梯度多孔介质材料降低了较高雷诺数下剪切层的不稳定性,扩展了尾流区域并延迟了剪切层的卷起或涡流脱落,降低了结构物表面升阻力的波动,从而降低流动噪声,提升水下航行器的隐身性。
Noise reduction guide pipe suitable for pump-jet propeller and pump-jet propeller
一种适用于泵喷推进器的降噪导管及泵喷推进器
2024-08-16
Patent
Electronic Resource
Chinese