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首页> 外文会议>28th European Rotorcraft Forum >ROTOR WAKE VORTEX DEFINITION ― INITIAL EVALUATION OF 3-C PIV RESULTS OF THE HART-II STUDY
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ROTOR WAKE VORTEX DEFINITION ― INITIAL EVALUATION OF 3-C PIV RESULTS OF THE HART-II STUDY

机译：转子尾涡定义-HART-II研究的3-C PIV结果的初步评估

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An initial evaluation is made of extensive three-component (3-C) particle image velocimetry (PIV) measurements within the wake across a rotor disk plane. The model is a 40 percent scale BO-105 helicopter main rotor in forward flight simulation. This study is part of the HART II test program conducted in the German-Dutch Wind Tunnel (DNW). Included are wake vortex field measurements over the advancing and retreating sides of the rotor operating at a typical descent landing condition important for impulsive blade-vortex interaction (BVI) noise. Also included are advancing side results for rotor angle variations from climb to steep descent. Using detailed PIV vector maps of the vortex fields, methods of extracting key vortex parameters are examined and a new method was developed and evaluated. An objective processing method, involving a center-of-vorticity criterion and a vorticity "disk" integration, was used to determine vortex core size, strength, core velocity distribution characteristics, and unsteadiness. These parameters are mapped over the rotor disk and offer unique physical insight for these parameters of importance for rotor noise and vibration prediction.
机译：初步评估是在尾流中跨转子盘平面进行的广泛的三分量（3-C）粒子图像测速（PIV）测量。该模型是前向飞行仿真中比例为40％的BO-105直升机主旋翼。这项研究是在德国－荷兰风洞（DNW）中进行的HART II测试计划的一部分。包括在典型下降着陆条件下运行的转子前进和后退侧的尾流涡流场测量，这对于脉冲叶片-涡流相互作用（BVI）噪声很重要。还包括从爬升到陡降的转子角度变化的先进副结果。使用详细的PIV矢量涡旋图，研究了提取关键涡旋参数的方法，并开发和评估了一种新方法。一种客观的处理方法，涉及涡中心标准和涡“盘”积分，用于确定涡核尺寸，强度，铁心速度分布特征和不稳定度。这些参数被映射到转子盘上，并为这些对于转子噪声和振动预测非常重要的参数提供了独特的物理见解。

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