回转体表面条纹沟槽减阻水洞实验研究

Water Tunnel Experimental Investigation on Drag Reduction in Gyroidal Objects with Riblets Surface

本文在条纹沟槽表面减阻理论分析的基础上,对条纹沟槽表面回转体进行了大量的水洞实验研究。实验模型表面条纹沟槽采用直接加工方法,头部线型为双参数平方根圆头曲线,尾部线型为双参数尖尾曲线。实验结果分析表明,与相同形状、尺寸的光滑表面回转体相比,条纹沟槽表面回转体在一定速度范围内存在很好的减阻效果,最大减阻量超过6%,且在小攻角范围内减阻量基本稳定,对回转体升力特性也没有影响。对比不同尺寸条纹沟槽的减阻效果发现,降阻量不但随条纹沟槽宽度S变化,而且随来流速度U∞变化,即与无因次沟槽宽度S+(文中近似取S+=S.LRe2Ckx,其中k为总阻力Cx的修正因子)存在着一定的关系。对于V型条纹沟槽具有减阻效果的S+的范围在10到60之间。本文研究证明,条纹沟槽表面减阻技术在水下航行器设计领域有着很好的应用前景,同时文中所取得的研究成果对该技术的应用具有一定的促进作用。

Based on the theoretical investigation on the drag reduction of riblets surface, lots of water tunnel experimental research were carried out on gyroidal objects, which there are riblets on the surfaces. The experimental results show that the drag reduction effect is irrespective with the shapes of gryoidal objects. The ranges of drag reduction velocity in different sizes of riblets surface are different, and the drag reduction effects are different. The range of none dimension grove width in V-riblet surface -S^＋ is about 10 to 60, which there are the best drag reduction effect and the maximal drag reduction quantity exceeds 6 percent. The experimental approaches could be a support for using this drag reduction technique on underwater vehicles in future applications.