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Analysis of wake vortices of a medium range twin-propeller military cargo aircraft using statistically designed experiments.

机译：使用统计设计的实验分析中程双螺旋桨军用货运飞机的尾流涡流。

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摘要

An experimental study was initiated to analyze the trajectories of the streamwise vortices behind the wing tip and flap of a medium range and propeller driven twin-engine military cargo aircraft. The model used for the experimental study was a generic, high wing and half model of a propeller driven aircraft and mounted within Old Dominion University's Low Speed Wind Tunnel where the wind tunnel flow speed was set to constant value of 9 m/sec. The main purpose of the study was to reach regression models for the motion and vorticity strength of both vortices under varying factors such as angle of attack, flap angle, propeller pitch angle and downstream distance. Velocity measurements of the flow fields were accomplished using both Particle Image Velocimetry (PIV) and Hotwire Anemometry (HWA) to yield average velocities, turbulence levels, vorticity strengths and Reynolds shear stresses in the wake of the model. The results of measurements showed that the vertical motions, horizontal motions, and vorticity strengths of both vortices as well as the shortest distance between both vortices depend on the aforementioned factors and the interactions of some factors. It can be concluded that propeller pitch angle mainly affects the behaviors of the vortices as much as angle of attack to the extent that their second order terms take place in some of the regression models.
机译：开始了一项实验研究，以分析中程和螺旋桨驱动的双引擎军用货运飞机的机翼尖端和襟翼后面的流向涡流的轨迹。用于实验研究的模型是螺旋桨驱动飞机的通用高机翼半模型，安装在Old Dominion大学的低速风洞中，风洞流速设定为恒定值9 m / sec。这项研究的主要目的是在两种不同因素（例如攻角，襟翼角，螺旋桨俯仰角和下游距离）的影响下，建立两个涡旋运动和涡旋强度的回归模型。流场的速度测量使用粒子图像测速（PIV）和热线风速（HWA）来完成，以产生模型后的平均速度，湍流水平，涡度强度和雷诺剪切应力。测量结果表明，两个旋涡的垂直运动，水平运动和旋涡强度以及两个旋涡之间的最短距离取决于上述因素和某些因素的相互作用。可以得出结论，在某些回归模型中，螺旋桨的俯仰角主要影响涡旋的行为，而对攻角的影响最大。

著录项

  • 作者

    Sahin, Burhan.;

  • 作者单位

    Old Dominion University.;

  • 授予单位 Old Dominion University.;
  • 学科 Engineering Aerospace.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 222 p.
  • 总页数 222
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;
  • 关键词

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