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Experimental study of drag reduction characteristics related to the multifactor coupling of a bionic jet surface

  • Yun-qing Gu
  • Song-wei Yu
  • Jie-gang Mou
  • Tian-xing Fan
  • Shui-hua Zheng
  • Gang Zhao
Article
  • 4 Downloads

Abstract

To study the drag reduction of a jet surface, an experiment is conducted with a gyrorotor model. The aim of this study is to analyze the influence of the jet aperture, the jet angle and the rotational velocity coupled with the jet velocity on the friction torque acting on a jet surface model by using a jet surface drag reduction testing experimental platform. The drag reduction characteristics of the jet surface are also studied. The results show that the maximum drag reduction rate is attained when the jet diameter is 5 mm and the jet velocity is 1.2 m/s. The influence of the jet velocity on the drag reduction rate decreases as the diameter decreases. However, the maximum drag reduction rate can be attained when the angle of the jet is 30° and the velocity of the jet is 1.0 m/s. When the jet diameter is small, the influence of the jet velocity on the drag reduction rate is small, whereas the maximum drag reduction rate is attained when the jet angle is 30° and the jet velocity is 1.0 m/s. When the jet angle is 15°, the drag reduction rate fluctuation is distinct. The maximum drag reduction rate is attained when the rotational velocity is 2100 r/min and the jet velocity is 1.0 m/s. The results show that the best scheme is A2B2D3. A maximum drag reduction rate of 8.57% can be attained. The effective control of the jet effect on the separation of the boundary layer demonstrates the drag reduction principle of a bionic jet surface.

Key words

Drag reduction bionic jet surface friction torque coupling experiment 

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Notes

Acknowledgements

This work was supported by the Public Welfare Technology Application Projects of Zhejiang Province (Grant No. 2017C31025). The authors would like to thank Zhuang-zhi Sun, Evan Wang for their great help on this work.

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Copyright information

© China Ship Scientific Research Center 2019

Authors and Affiliations

  • Yun-qing Gu
    • 1
  • Song-wei Yu
    • 1
  • Jie-gang Mou
    • 1
  • Tian-xing Fan
    • 1
  • Shui-hua Zheng
    • 1
  • Gang Zhao
    • 2
  1. 1.College of Mechanical EngineeringZhejiang University of TechnologyHangzhouChina
  2. 2.College of Mechanical and Electrical EngineeringHarbin Engineering UniversityHarbinChina

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