College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, China.
Key Laboratory of dual dielectric Power Technology, Heibei Hanguang Industry Co. Ltd. Handan, China.
PLoS One. 2020 Jan 30;15(1):e0228186. doi: 10.1371/journal.pone.0228186. eCollection 2020.
Computational fluid dynamics (CFD) simulation is used to test two body design methods which use negative pressure gradient to suppress laminar flow separation and drag reduction. The steady-state model of the Transition SST model is used to calculate the pressure distribution, wall shear stress, and drag coefficient under zero angle of attack at different velocities. Four bodies designed by two different methods are considered. Our results show the first method is superior to the body of Hansen in drag reduction and the body designed by the first method is more likely to obtain the characteristics of suppressing or eliminating separation, which can effectively improve laminar flow coverage to achieve drag reduction under higher Reynolds number conditions. The results show that the negative pressure gradient method can suppress separation and drag reduction better than the second method. This successful design method is expected to open a promising prospect for its application in the design of small drag, small noise subsonic hydrodynamic hull and underwater weapons.
计算流体动力学（CFD）模拟用于测试两种利用负压梯度抑制层流分离和减阻的体设计方法。采用 Transition SST 模型的稳态模型计算了在不同速度下零攻角下的压力分布、壁面剪切应力和阻力系数。考虑了由两种不同方法设计的四个体。我们的结果表明，第一种方法在减阻方面优于 Hansen 体，且第一种方法设计的体更有可能获得抑制或消除分离的特性，这可以有效地提高层流覆盖范围，从而在更高雷诺数条件下实现减阻。结果表明，负压梯度法比第二种方法更能抑制分离和减阻。这种成功的设计方法有望为其在小阻力、低噪声亚声速水动力船体和水下武器的设计中的应用开辟广阔的前景。
