Purpose

Spinning slender bodies are affected by lateral Magnus forces and moments when exposed to cross-flow. The effects occurring for spinning bodies of revolution in combination with stabilising or control surfaces such as canards are not yet fully explained. Therefore the present work aims to investigate the phenomena arising from the interactions of a roll-decoupled guidance unit with a spinning rear body are investigated.

Design/methodology/approach

A generic tangential-ogive-cylinder projectile equipped with deflectable canards on a roll-decoupled nose is investigated by means of 3D Reynolds-averaged Navier–Stokes simulations at Mach number 2 for angles of attack up to 22 degrees. Different canard deflection angles up to 9 degrees are considered. Global aerodynamic coefficients as well as local flow fields are analysed to explain the interactions occurring between the roll-decoupled guidance unit and the spinning rear body.

Findings

The deflected canards lead to flow interactions resulting in lateral forces and moments even without a spinning motion of the rear part. Depending on the canard deflection angles, these forces act in or against the direction of the classical Magnus effect. For angles of attack smaller than 10 degrees it is possible for the current body geometry to directly superpose the lateral effects resulting from the fins for the non-spinning model with those occurring for the non-finned but spinning model to obtain the total forces and moments acting on a spinning model with canted canards. However, the lateral effects generated on the guidance unit itself are insignificant compared to the canard-induced effects on the rear body.

Originality/value

A detailed analysis of the interaction effects arising from a decoupled guidance unit containing canards with a non-spinning/spinning rear body is performed and the underlying phenomena are revealed.

中文翻译：

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旋转的旋转体上辊分离的鸭嘴的马格努斯效应

目的

旋转的细长物体受到横向马格努斯力和横向流动时的力矩的影响。尚未充分说明纺纱旋转体结合稳定或控制面（例如鸭绒）所产生的影响。因此，本发明的目的是研究由滚动解耦的导向单元与旋转的后车身的相互作用引起的现象。

设计/方法/方法

通过在3马赫数下的3D雷诺平均Navier-Stokes模拟研究了攻角高达22度的通用切向圆柱体射弹，该射弹在侧倾解耦的机头上装有可偏转的卡纳德。考虑到高达9度的不同卡纳德偏转角。分析了整体空气动力学系数以及局部流场，以解释在解滚导引单元和旋转后身之间发生的相互作用。

发现

弯曲的鸭绒导致流动相互作用，即使没有后部的旋转运动，也导致侧向力和力矩。这些作用力取决于卡纳德偏转角，作用于经典马格努斯效应的方向或与之相反。对于小于10度的迎角，当前的身体几何形状可以直接将非旋转模型的鳍片与非鳍但旋转模型的鳍片产生的侧向效应叠加，以获得总力和力矩用倾斜的鸭嘴在旋转模型上动作。然而，与卡纳德感引起的对后车身的影响相比，在导向装置本身上产生的侧向作用微不足道。

创意/价值

进行了详细的分析，分析了一个分离的制导单元所产生的相互作用，该制导单元包含带有非旋转/旋转后身的鸭嘴，并揭示了潜在的现象。