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Influence of Bending Locations and Angles on the Aerodynamic Performance of a Bent Body Projectile

机译:弯曲位置和弯曲角度对弯曲身体弹丸气动性能的影响

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Multiple numerical techniques are used to investigate the effect of the location of the body bend location (varied from nose base to center-of-gravity) and the nose and body bending angles (each varied from 0° to 7.5°) on the aerodynamic performance of a bent body projectile in the supersonic regime. Each of the numerical techniques was validated for the baseline Air Force Finner (AFF) geometry. Simulations of 31 different bent body configurations using the Reynolds-Averaged Navier-Stokes (RANS) code were completed at Mach 2 and Mach 3. Some of the bent body configurations were found to obtain a trimmed condition (approximately 30% at Mach 2 and 6% at Mach 3), but most were unstable. A subset of the configurations, to include both unstable and stable configurations, was investigated in greater detail, including with an Euler code. The Euler code provided reasonable results when compared to the RANS solutions with superior efficiency. A comparison of 4 bent body configurations to the AFF with deflected canards showed that greater control authority could likely be obtained for the bent body configuration, if static stability is not considered a prerequisite.
机译:使用多种数值技术来研究身体弯曲位置(从鼻子底部到重心的变化)以及鼻子和身体弯曲角度(分别从0°到7.5°)的影响对空气动力学性能的影响在超音速状态下弯曲的身体弹丸。每种数值技术均已针对基准空军Finner(AFF)几何形状进行了验证。使用雷诺平均Navier-Stokes(RANS)代码在31和2马赫数下完成了31种不同弯曲体构型的仿真。发现某些弯曲体构型获得了修整状态(在2和6马赫数下约为30%) %达到3马赫),但大多数不稳定。对配置的子集(包括不稳定配置和稳定配置)进行了更详细的研究,包括使用Euler代码。与具有卓越效率的RANS解决方案相比,Euler代码提供了合理的结果。将4个弯曲体构型与带有弯曲鸭嘴的AFF进行比较表明,如果不将静态稳定性视为前提条件,则可以为弯曲体构型获得更大的控制权限。

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    《 》|2018年|10081-10105|共25页
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