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Predictions of Rotor and Rotor/Airframe Configurational Effects on Brownout Dust Clouds

机译：转子和转子/飞机构型对节电尘埃云的预测

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摘要

Brownout dust cloud simulations were conducted for rotorcraft undergoing representative landing maneuvers, primarily to better understand the effects of different rotor placement and rotor/airframe configurations. A time-dependent free-vortex wake for the rotors and surface singularity method for the airframe were employed to represent the carrier phase of the flow. A coupling strategy for the free-vortex method was developed to include the effects of rotors operating at different rotational speeds, such as a tail rotor. For the dispersed phase of the flow, particle tracking was used to model the dust cloud based on solutions to a decoupled form of Basset-Boussinesq-Oseen equations appropriate to dilute gas/particle suspensions of low Reynolds number Stokes flow. The predicted flow fields near the ground and resulting dust clouds during the landing maneuvers were analyzed to better understand the nature and severity of their development and to examine differences produced by various rotor and airframe configurations. The formation of dust clouds was found to be partially sensitive to the transitional phase of the landing maneuver, when there were more significant aerodynamic interactions between the rotor wake and the fuselage.
机译：进行了具有代表性的着陆演习的旋翼飞机降落尘埃云模拟，主要是为了更好地了解不同旋翼布置和旋翼/机身配置的影响。旋翼的时变自由涡流和机身的表面奇异性方法被用来表示流的载体相。开发了一种用于自由涡流方法的耦合策略，以包括以不同转速运行的转子（例如尾桨）的影响。对于流的分散相，基于适合于稀释低雷诺数斯托克斯流的气体/颗粒悬浮液的去耦形式的Basset-Boussinesq-Oseen方程的解，使用粒子跟踪对粉尘云进行建模。分析了着陆演习期间靠近地面的预测流场以及由此产生的尘云，以更好地了解其发展的性质和严重程度，并检查各种旋翼和机身配置所产生的差异。当旋翼尾流和机身之间存在更重要的空气动力学相互作用时，发现尘埃云的形成对着陆机动的过渡阶段部分敏感。

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  • 来源
    《Journal of Aircraft》 |2016年第2期|545-560|共16页
  • 作者

    Govindarajan B. M.; Leishman J. G.;

  • 作者单位

    Univ Maryland, Dept Aerosp Engn, College Pk, MD 20742 USA;

    Embry Riddle Aeronaut Univ, Dept Aerosp Engn, Aerosp Engn, Daytona Beach, FL 32114 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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