【摘要】 针对永磁一体化离心泵叶轮锥形前盖板流阻增大、功耗升高的问题，在封闭流场条件和优化动静间隙的基础上,结合等尺寸肋条减阻原理提出了一种渐变肋条减阻结构。研究分析了渐变肋条减阻结构的减阻效应,并与光滑平面圆盘、光滑锥形圆盘和等尺寸肋条锥形圆盘进行了对比分析。结果表明:渐变肋条通过沿径向调整其几何尺寸,能更有效地重构近壁区流动结构,改变流线形态与速度分布,从而优化壁面剪切力场,实现对流动分离与湍流耗散的有效调控;对于锥形旋转圆盘,通过在锥面布置渐变形肋条可使其阻力扭矩低于光滑平面圆盘和等尺寸肋条圆盘,额定转速下其扭矩系数相较光滑平面圆盘下降9.9%,相较等尺寸肋条锥形圆盘扭矩系数下降2.31%。文中研究可为离心泵叶轮的低阻力设计与性能提升提供理论参考。更多还原

【Abstract】 Based on the enclosed flow field conditions and optimized dynamic-static clearances, a gradually-varying riblet drag reduction structure was proposed by combining the drag reduction principle of uniform-sized riblets to address the problem of increased flow resistance and higher power consumption of the conical front shroud region of the impeller in permanent magnet integrated centrifugal pumps. The drag reduction effect of the gradually-varying riblet structure was investigated and compared with that of a smooth flat disk, a smooth conical disk, and a conical disk with uniform-sized riblets.The results indicate that by adjusting its geometric dimensions along the radial direction, the gradually-varying riblets can more effectively reorganize the near-wall flow structure and alter streamline patterns and velocity distributions, thereby optimizing the wall shear stress field and achieving effective control over flow separation and turbulent dissipation. For the conical rotating disk, arranging gradually-varying riblets on the conical surface can reduce the drag torque below that of both the smooth flat disk and the disk with uniform-sized riblets. Specifically, at the rated rotational speed, the torque coefficient decreases by 9.9% compared to the smooth flat disk and by 2.31% compared to the conical disk with uniform-sized riblets.This study can provide a theoretical reference for the low-resistance design and performance improvement of centrifugal pump impellers.更多还原