Drag Reduction Effect of Gradually-Varying Riblet Structures on Conical Rotating Disks
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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。
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关键词:
- 永磁一体化离心泵叶轮 /
- 减阻 /
- 锥形旋转圆盘 /
- 渐变肋条
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. -
图 4 不同间隙比下光滑圆盘扭矩系数
Figure 4. Torque coefficients of smooth disks under different gap ratios
图 10 不同圆盘局部速度云图与流线图
Figure 10. Local velocity contours and streamline patterns of different disks
图 12 渐变肋条结构优化设计方案
Figure 12. Optimization design schemes of gradually-varying riblet structures
图 13 额定转速下不同圆盘扭矩系数对比
Figure 13. Comparison of torque coefficients of different disks at rated speed
表 1 网格无关性验证
Table 1. Mesh independence verification
网格方案 网格数 阻力扭矩/(N·m) 1 3.03×106 0.6689 2 3.70×106 0.6763 3 4.99×106 0.6779 
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表 2 光滑平面圆盘数值计算与实验结果对比
Table 2. comparison between numerical calculation and experimental results of smooth flat disk
转速
/(r/min)数值仿真
阻力扭矩系数实验
阻力扭矩系数相对
误差/%800 0.016 60 0.017 39 4.54 1 000 0.016 19 0.016 60 2.46 1 200 0.015 38 0.015 58 1.33 1 400 0.015 16 0.015 54 2.44
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表 3 不同转速工况下圆盘扭矩系数对比
Table 3. Comparison of disk torque coefficients under different rotational speeds
转速/(r/min) 光滑平面圆盘
扭矩系数等尺寸肋条锥形
圆盘扭矩系数渐变肋条锥形
圆盘扭矩系数500 0.000 736 0.000 664 0.000 651 800 0.001 67 0.001 53 0.001 50 1 400 0.004 52 0.004 20 0.004 09
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