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RANS Simulation Validation of a Small Sensor Turret for UAVs

机译：无人机小型传感器塔架的RANS仿真验证

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摘要

Recent Unmanned Aerial Vehicle (UAV) design procedures rely on full aircraft steady-state Reynolds-Averaged-Navier-Stokes (RANS) analyses in early design stages. Small sensor turrets are included in such simulations, even though their aerodynamic properties show highly unsteady behavior. Very little is known about the effects of this approach on the simulation outcomes of small turrets. Therefore, the flow around a model turret at a Reynolds number of 47,400 is simulated with a steady-state RANS approach and compared to experimental data. Lift, drag, and surface pressure show good agreement with the experiment. The RANS model predicts the separation location too far downstream and shows a larger recirculation region aft of the body. Both characteristic arch and horseshoe vortex structures are visualized and qualitatively match the ones found by the experiment. The Reynolds number dependence of the drag coefficient follows the trend of a sphere within a distinct range. The outcomes indicate that a steady-state RANS model of a small sensor turret is able to give results that are useful for UAV engineering purposes but might not be suited for detailed insight into flow properties. (c) 2019 American Society of Civil Engineers.
机译：最近的无人飞行器（UAV）设计程序在早期设计阶段就依赖于完整的飞机稳态雷诺-平均-Navier-斯托克斯（RANS）分析。小型传感器转塔也包含在这种模拟中，即使它们的空气动力学特性显示出非常不稳定的行为。关于这种方法对小炮塔仿真结果的影响知之甚少。因此，使用稳态RANS方法模拟了雷诺数为47,400的模型炮塔周围的流动，并将其与实验数据进行了比较。升力，阻力和表面压力与实验显示出良好的一致性。 RANS模型预测分离位置在下游太远，并在机体后部显示较大的再循环区域。特有的弓形和马蹄形涡旋结构均可视化，并在质量上与实验发现的相匹配。阻力系数的雷诺数依赖性遵循球体在不同范围内的趋势。结果表明，小型传感器炮塔的稳态RANS模型能够提供对无人机工程有用的结果，但可能不适合详细了解流动特性。 （c）2019美国土木工程师学会。

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  • 来源
    《Journal of aerospace engineering》 |2019年第5期|04019060.1-04019060.12|共12页
  • 作者

    Goetten Falk; Havermann Marc; Braun Carsten; Gomez Francisco; Bil Cees;

  • 作者单位

    RMIT Univ, Dept Aerosp Engn & Aviat, Plenty Rd, Bundoora, Vic 3083, Australia|Fachhsch Aachen Univ Appl Sci, Dept Aerosp Engn, Hohenstaufenallee 6, D-52064 Aachen, Germany;

    Fachhosch Aachen Univ Appl Sci, Dept Aerosp Engn, Fluid Dynam, Hohenstaufenallee 6, D-52064 Aachen, Germany;

    Fachhosch Aachen Univ Appl Sci, Dept Aerosp Engn, Aircraft Design, Hohenstaufenallee 6, D-52064 Aachen, Germany;

    RMIT Univ, Dept Aerosp Engn & Aviat, Computat Aerodynam, Plenty Rd, Bundoora, Vic 3083, Australia;

    RMIT Univ, Dept Aerosp Engn & Aviat, Aircraft Design, Plenty Rd, Bundoora, Vic 3083, Australia;

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