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Volume 19 Issue 4
 
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Article Navigation >  Journal of Unmanned Undersea Systems  > 2011  >  19(4): 241-245
YI Hui, ZHANG Yu-wen, YUAN Xu-long, WANG Ya-dong. Cavity Shape and Drag Characteristics of Underwater High-speed Projectile[J]. Journal of Unmanned Undersea Systems, 2011, 19(4): 241-245. doi: 10.11993/j.issn.1673-1948.2011.04.001
Citation: YI Hui, ZHANG Yu-wen, YUAN Xu-long, WANG Ya-dong. Cavity Shape and Drag Characteristics of Underwater High-speed Projectile[J]. Journal of Unmanned Undersea Systems, 2011, 19(4): 241-245. doi: 10.11993/j.issn.1673-1948.2011.04.001
shu

Cavity Shape and Drag Characteristics of Underwater High-speed Projectile

doi: 10.11993/j.issn.1673-1948.2011.04.001

  • College of Marine Engineering, Northwestern Polytechnical University, Xi′an 710072, China

  • Received Date: 2010-12-16
  • Rev Recd Date: 2011-02-09
  • Publish Date: 2011-08-31
    Abstract
  • Experimental study of projectile has many restrictions under underwater high-speed motion with cavity. To obtain the variation rules of cavity shape and drag characteristics of an underwater high-speed projectile, we investigated cavity shape and drag characteristics of the projectile by using computational fluid dynamics (CFD) and a formula based on the independent expansion principle of cavity sections. Conclusions are drawn that the numerical simulation agrees well with the computation of the formula; the relative length, relative diameter and slenderness ratio of cavity increase with the reduction of cavitation number; for small cavitation number, the shape of cavity front changes little, and the stable pressure difference coefficient becomes the main part of drag coefficient. We suggest the steps of shape design of the underwater high-speed projectile as follows: 1) tentative modeling by formula computing; 2) modifying model by numerical simulation; 3) establishing model by experimental method.

     

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