离散粗糙元诱发边界层转捩的实验研究

发布时间：2018-01-25 04:19

  本文关键词： 红外 边界层转捩 离散粗糙元 转子叶片　出处：《空气动力学学报》2016年01期 　论文类型：期刊论文

【摘要】：针对直升机转子叶片模型表面离散粗糙元诱发边界层转捩问题开展了实验研究,分析不同雷诺数下粗糙元尺寸参数对转捩位置的影响。实验在中航工业气动院直升机转子叶片模拟装置进行,在模型转子叶片表面布置不同尺寸的离散柱状粗糙元,利用红外热像技术探测边界层转捩,并提出一种基于湍流/层流区域面积比的转捩位置判定准则,目的是实现边界层转捩位置自动识别,进而分析粗糙元尺寸参数对转捩位置的影响。实验转速为300至600r/m,对应叶尖切向速度为25~40m/s。实现了对旋转叶片边界层转捩位置的定量测量,通过实验验证,转捩位置判定算法正确可靠,初步得到了不同高度DRE诱发转捩位置与雷诺数之间的关系,随着粗糙元高度的增加,转捩位置逐渐靠前。
[Abstract]:An experimental study on boundary layer transition induced by discrete rough element on rotor blade surface of helicopter is carried out. The influence of the size parameters of rough elements on the transition position is analyzed under different Reynolds numbers. The experiment is carried out in the rotor blade simulation device of the helicopter in the Air China Industrial Pneumatic Institute. Discrete cylindrical rough elements with different sizes are arranged on the blade surface of the model rotor. The infrared thermal imaging technique is used to detect the boundary layer transition, and a transition location criterion based on the area ratio of turbulent / laminar flow region is proposed. The purpose of this paper is to realize automatic boundary layer transition location identification and to analyze the effect of the size parameters of rough element on transition position. The experimental rotational speed is 300 ~ 600r / m. The corresponding tip tangential velocity is 25 ~ 40 m / s. The quantitative measurement of the transition position of the boundary layer of the rotating blade is realized. The experimental results show that the algorithm for determining the transition position is correct and reliable. The relationship between transition location and Reynolds number induced by DRE at different heights was preliminarily obtained. With the increase of the height of rough elements, the transition position gradually moved forward.
【作者单位】： 中国航空工业空气动力研究院高速高雷诺数航空科技重点实验室;
【分类号】：V211.52
【正文快照】： 0引言边界层转捩问题一直以来都是理论和工程应用研究的热点话题。通常使用缩比模型对直升机螺旋桨进行气动力实验研究,由于存在尺度效应,实验模型边界层转捩位置与全尺寸情况下不同。导致实验测量的一些气动力系数存在误差,例如悬停效率、力矩系数等[1]。因此需要采用固定转，

本文编号：1461963