The Development of Steady State Rotor Wakes

机译：稳态转子苏醒的发展

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The regions over which steady and unsteady rotorrnwake patterns exist have been examined numericallyrnfor one and two-bladed rotors. A lifting-line theory isrnused to model each rotor blade and a time-steppingrnvortex method is used to calculate the tip-vortex mo-rntion. Tip-vortex geometries for a rotor in hover andrnvertical climb have been computed. The velocitiesrnwithin the wake have been obtained and the resultsrnindicate a periodic nature of the wake in both timernand space. However, the temporal periodicity is lim-rnited to only the frst few turns of the tip-vortex forrnhovering rotors, while for rotors in suu000ecient climb,rnthe entire wake is steady relative to the blades andrnboth spatially and temporally periodic. Rotor thrustrncalculations have been performed and the eu000bect ofrnthe lower wake on rotor thrust determined. The com-rnputed thrust values show some variation due to thernfact that the lower wake remains unsteady. The re-rnsults for the wake geometry are analysed and com-rnpared to previous predictions and experimental re-rnsults.

机译：对于一个和两个叶片的转子，已经在数值上检查了存在稳定转子和非稳定转子的图形。运用举升线理论对每个转子叶片进行建模，并采用时间步进涡旋方法来计算尖端涡旋运动。已经计算了悬停和垂直爬升的转子的尖端涡旋几何形状。已经获得了尾流内的速度，结果表明尾流在时间和空间上都是周期性的。然而，时间周期只限于尖端涡旋盘旋转子的最初几圈，而对于足够爬升的转子，整个尾流相对于叶片是稳定的，并且在空间和时间上都是周期性的。已经进行了转子推力的计算，并且确定了较低的尾流对转子推力的影响。由于较低的尾流保持不稳定的事实，计算的推力值显示出一定的变化。分析了尾流几何形状的结果，并与先前的预测和实验结果进行了比较。

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来源
《American Helicopter Society aeromechanics specialists meeting (Aeromechanics 2000)》|2000年|p.1-10|共10页
会议地点 Atlanta GA(US);Atlanta GA(US)
作者
Santosh Kini; A.T. Conlisk;
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作者单位

Graduate Student, The Ohio State Universitykini.3@osu.eduColumbus, Ohio 43210;

Professor, The Ohio State Universityconlisk.1@osu.eduColumbus, Ohio 43210;

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会议组织
原文格式 PDF
正文语种 eng
中图分类基础理论及试验;
关键词
A: aspect ratio; CT: coeu000ecient of thrust,T/(u0019u001an2R4); N: number of blades; R: blade radius, m; T: rotor thrust, N;

机译：A：长宽比； CT：推力系数T /（u0019u001an2R4）； N：叶片数； R：叶片半径，m； T：转子推力，N;

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The Development of Steady State Rotor Wakes

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