Abstract

The current work focuses on wall temperature (300–1200 K), dimensionless spin rate (0–0.315) and angles of attack (0–10°) on Magnus effects for the 7-caliber Army-Navy Spinner Rocket (ANSR) using Reynolds-averaged Navier-Stokes methods. The Mach number and the Reynolds number, in terms of the free-stream velocity and the ANSR diameter, are 1.8 and 8.37 × 10⁵. Different turbulence models are verified by a fully developed turbulent channel flow to ensure accurate prediction of the near-wall turbulence. The k-epsilon Yang-Shih model provides a favorable result in terms of the logarithmic velocity, turbulent kinetic energy, turbulent shear stress and dissipate rate. The ANSR simulations suggest that the Magnus force is approximately proportional to the dimensionless spin rate. Furthermore, the simulations provide a profound insight into the flow structure and reveal that the separation point moves forward with the increasing dimensionless spin rate. With the increase of angle of attack between 0–10°, the boundary layer thickness distortion increases, however the variation of the separation point is negligible. The current study also suggests that higher surface temperature has a positive effect on reducing the Magnus and drag forces, in the meantime, on increasing the lift force.

摘要

目前的工作重点是壁温 (300–1200 K)、无量纲旋转速率 (0–0.315) 和攻角 (0–10°) 对使用雷诺的 7 口径陆军-海军旋转火箭 (ANSR) 的马格努斯效应-平均 Navier-Stokes 方法。就自由流速度和 ANSR 直径而言，马赫数和雷诺数分别为 1.8 和 8.37 × 10 ⁵. 不同的湍流模型通过充分发展的湍流通道流进行验证，以确保准确预测近壁湍流。k-epsilon Yang-Shih 模型在对数速度、湍流动能、湍流剪应力和耗散率方面提供了有利的结果。ANSR 模拟表明马格努斯力与无量纲自旋速率大致成正比。此外，模拟提供了对流动结构的深刻洞察，并揭示了分离点随着无量纲自旋率的增加而向前移动。随着攻角在0~10°之间的增加，边界层厚度畸变增加，但分离点的变化可以忽略不计。