偏转工况下吊舱推进器的水动力和空泡性能

Hydrodynamic and cavitation performance of podded propulsor under steering conditions

    摘要
  • 摘要:
      目的  吊舱推进器与螺旋桨之间干扰强烈，流动现象复杂。在操舵工况下远离设计点条件工作时，桨叶载荷会出现剧烈变化，且空泡性能也将同步恶化。为了分析吊舱推进器在偏转工况下的水动力和空泡性能，
      方法  首先，采用全结构网格，基于雷诺平均(RANS)数值模拟方法对吊舱推进器的水动力性能开展研究；然后，采用Sauer模型预报吊舱推进器偏转工况下的空泡性能；最后，在空泡水筒中开展吊舱推进器的模型实验。
      结果  结果表明：数值计算结果与实验结果的吻合度较高，验证了数值预报方法的准确性；偏转工况下，吊舱桨的推力和扭矩均高于直航工况；吊舱偏转后，随着周向角的变化，不同周向位置的压力将呈脉动变化趋势；桨叶的空泡形态存在差异性，且随吊舱偏转角度的增加而恶化。
      结论  研究成果可以为吊舱推进器设计提供参考。

     

    Abstract:
      Objectives  The interaction between the body of pod propulsor and the propeller is great, leading to complex flow phenomena.As a consequence, under steering condition which is away from design point, loads of blades change sharply and the cavity characteristics deteriorate.In order to analyze the hydrodynamic characteristics of the pod propulsor,
      Methods  the full structural grid based on the Reynolds Averaged Navier-Stokes (RANS) approach is adopted.Besides, the cavity structures are predicted by the Sauer model.Finally, the model experiment of the pod propeller is carried out in the cavity channel.
      Results  The results show that the numerical data are in great agreement with the experiment counterparts which presents the correspondingly high accuracy of this numerical model.Under steering condition, the thrust and torque of pod propulsor are greater than the counterparts under straight condition.After the propulsor deflects, the pressure at different circumferential positions fluctuates with the change of circumferential angle.What's more, cavity contours show different structures and the cavitation intensifies as the deflection angle rises.
      Conclusions  The research results can provide reference for the design of pod propeller.

     

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