尾翼迎流面积不变时Suboff尾部参数对桨盘面伴流品质的影响

Influence of Suboff stern structure on the wake field quality at propeller disk with fixed stern upwind area

  • 摘要:
    目的 探究水下航行体桨盘面伴流场均匀性随尾翼位置和尾部去流角的变化规律,揭示航行体尾部结构对伴流场的影响机理。
    方法 采用计算流体力学(CFD)方法对水下航行体进行数值模拟分析,并对伴流场不均匀度指标进行高斯过程建模分析,探究设计范围内结构−流场的形性协同响应,分析Suboff尾部结构对伴流场不均匀度的敏感性,探寻伴流均匀的Suboff尾部结构。
    结果 结果显示,在固定尾翼迎流面积保证航行体操作性能和航行效率的情况下,尾翼位置和尾部去流角会对桨盘面不均匀度产生较大影响;当去流角θ = 10°时,尾翼后移会使桨盘面伴流目标函数(WOF)值从0.124 5降至0.091 4;当去流角θ = 20°时,尾翼后移会使桨盘面WOF值从0.104 9先升至0.114 5随后降至0.106 8;当尾翼轴向位置为3.810 0 m时,去流角增大会使桨盘面WOF值从0.124 5降至0.104 9;当尾翼轴向位置h = 4.114 8 m时,去流角的增大会加剧桨盘面的不均匀性,WOF值从0.091 4升至0.106 8;利用高斯过程建模分析和敏感性分析,改善Suboff的尾部结构能有效降低桨盘面伴流场的不均匀度。
    结论 研究表明,对于尾翼迎流面积不变的Suboff模型,大的尾翼轴向位置与小的尾部去流角配置可显著提升桨盘面伴流场的均匀性,能为水下航行体尾部结构设计提供指导依据。

     

    Abstract:
    Objectives This paper investigates the variation in the uniformity of the wake field on the propeller disk of an underwater vehicle according to the tail fin axial position and angle of run of the stern, and reveals the influence mechanism of the stern structure on the wake field.
    Methods Numerical simulation analysis of the underwater vehicle is carried out using the computational fluid dynamics (CFD) method, and Gaussian process modeling analysis is performed for the wake field inhomogeneity index to explore the response relationship between structure-field performance within the design range, analyze the sensitivity of the stern structure to wake field inhomogeneity, and search for a Suboff stern structure with excellent wake field homogeneity.
    Results As the results show, with a fixed tail fin axial upwind area to ensure the operation performance and sailing efficiency of the underwater vehicle, the tail fin axial position and angle of run of the stern have a large impact on the propeller disk inhomogeneity; when the angle of run of the stern is \theta =10^\circ , the backward movement of the tail fin axial reduces the propeller disk inhomogeneity, and the wake objective function (WOF) decreases from 0.124 5 to 0.091 4; when the angle of run of the stern is \theta =20^\circ , the backward movement of the tail fin axial causes the inhomogeneity of the propeller disk to first increase and then decrease, and the WOF increases from 0.1049 to 0.1145, then decreases to 0.1068; when the tail fin axial position is h= 3.810 0 m, the increase of the angle of run of the stern makes the propeller disk inhomogeneity decrease, and the WOF decreases from 0.124 5 to 0.104 9; and when the tail fin axial position is h= 4.114 8 m, the increase of the angle of run of the stern makes the propeller disk inhomogeneity increase, and the WOF increases from 0.091 4 to 0.106 8. This shows that the adjustment of the Suboff stern structure using Gaussian process modeling analysis can effectively reduce the inhomogeneity of the wake field on the propeller disk.
    Conclusions For a Suboff model with a fixed stern upwind area, a configuration with a large tail fin axial position and small angle of run of the stern can significantly enhance the propeller disk wake field uniformity. The findings of this study can provide useful references for the design of the stern structures of underwater vehicles.

     

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