Fundamental studies of rotor wakes in low speed forward flight using wide-field shadowgraphy
Fundamental studies of rotor wakes in low speed forward flight using wide-field shadowgraphy
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使用宽视场阴影成像技术对低速前飞旋翼尾流进行基础研究
DOI：
10.2514/6.1991-3232
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发表时间：
1991
影响因子：
1.5
通讯作者：
A. Bagai
中科院分区：
文献类型：
--
作者：
J. Leishman;A. Bagai
利用广视场阴影法对直升机旋翼低速前飞尾迹几何形状进行了可视化实验。这些实验是在孤立的旋翼和代表直升机机身的机身上进行的。特别注意记录了孤立的旋翼尾迹几何形状、旋翼平面附近的叶片涡干扰现象、由于物体的存在而对尾迹造成的扭曲，以及叶尖涡与体表面的交互作用。定量测量了尾迹随尾迹年龄的变化规律，并估算了叶尖涡核半径。结果提供了旋翼尾迹结构的许多细节，对于验证前飞中的旋翼尾迹和旋翼/机体相互作用模型是有用的。宽视场阴影法的使用为可视化旋翼尾迹涡提供了重要的工具，有助于理解前飞旋翼尾迹的复杂三维特性。
Experiments were conducted using the wide-field shadowgraph method to visualize the wake geometry from a helicopter rotor in low speed forward flight. The experiments were performed with an isolated rotor and with a body representing a helicopter fuselage. Particular attention was paid to documenting the isolated rotor wake geometry, blade vortex interaction phenomena near the rotor plane, the distortion made to the wake due to the presence of the body, and detailing the interaction of the tip vortices with the body surface. Quantitative measurements were made of the wake trajectories as functions of wake age, as well as estimates of the tip vortex core radius. The results have provided many details of the rotor wake structure that are useful for validating rotor wake and rotor/body interactional models in forward flight. The use of the wide-field shadowgraph method offers an important tool for visualizing rotor wake vortices, and helping to understand the complex three-dimensional nature of rotor wakes in forward flight.