摆线桨非定常气动特性研究
收稿日期: 2013-08-26
修回日期: 2014-02-26
网络出版日期: 2014-03-20
Research on the Unsteady Aerodynamic Characteristics of Cycloidal Propeller
Received date: 2013-08-26
Revised date: 2014-02-26
Online published: 2014-03-20
以西北工业大学研制的滚翼飞行器为研究对象，对摆线桨二维简化模型进行了非定常数值模拟。非定常时间推进采用双时间法，计算模型的刚体运动和网格变形采用弹簧近似光滑模型和局部重划模型相结合的动网格技术来处理。重点对四桨叶摆线桨转动过程中的瞬时推力、桨叶气动力及其非定常流场进行了研究，结果表明：摆线桨转动一周中瞬时推力大小随转动方位角变化呈近似正弦规律的周期性波动；随着转速变化，摆线桨转动一周的平均推力方向几乎保持恒定；桨叶瞬时法向力和切向力随方位角变化呈明显的“∞”型迟滞环曲线，且桨叶上行状态的气动力明显大于下行状态气动力；摆线桨桨叶尾迹之间具有很强的非定常干扰，对桨叶气动性能会产生较大影响。
唐继伟 , 胡峪 , 宋笔锋 . 摆线桨非定常气动特性研究[J]. 航空学报, 2014 , 35(7) : 1882 -1892 . DOI: 10.7527/S1000-6893.2013.0004
A prototype of a cycloidal propulsion vehicle which is developed by Northwestern Polytechnical University is chosen as the research model of this paper. To investigate the unsteady aerodynamics of the cycloidal propeller, numerical analysis is conducted on a two-dimensional simplified cycloidal propeller model. The dual-time method is used for unsteady time marching. The dynamic mesh method of the spring-based smoothing method and the local remeshing method are adopted for dealing with the problem caused by the rigid blade motion and mesh deformation. The instantaneous thrust, blade force and unsteady flow fields of the 4-bladed cycloidal propeller are analyzed, and some conclusions are drawn. The instantaneous thrust periodically fluctuates with azimuth as an approximated sinusoidal curve; the average direction of thrust during one revolution keeps almost constant with the variation of the rotation speed of the cycloidal propeller; the curves of blade normal force and blade tangent force coefficients with varying pitch angles are hysteresis loops, and the blade force is obviously larger when the blade moves upward than when it moves downward; the blade aerodynamics is strongly affected by the strong unsteady interactions between wakes of the blades.
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