热线风速仪对共流射流翼型流动控制的实验研究。

Experimental investigation of co-flow jet's airfoil flow control by hot wire anemometer.

作者信息

Bahrami A, Hoseinzadeh S, Heyns P S, Mirhosseini S M

机构信息

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

Centre for Asset Integrity Management, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0081, South Africa.

出版信息

Rev Sci Instrum. 2019 Dec 1;90(12):125107. doi: 10.1063/1.5113592.

DOI:10.1063/1.5113592

PMID:31893769

Abstract

An experimental flow control technique is given in this paper to study the jet effect on the coflow jet's airfoil with injection and suction and compared with the jet-off condition. The airfoil is CFJ0025-065-196, and the Reynolds number based on the airfoil's chord length is 10. To measure the turbulence components of flow, a hot wire anemometry apparatus in a wind tunnel has been used. In this paper, the effect of the average velocity and boundary layer thickness on the coflow jet's airfoil is analyzed. The test is done for two different coflow velocities and for different angles of attack. It is also shown that, by increasing the velocity difference between the jet and the main flow, separation is delayed, and this delay can be preserved by raising coflow velocity at higher angles of attack. So, this flow control method has a good efficiency, and it is possible to reach higher numbers of lift and lower numbers of drag coefficients.

摘要

本文给出一种实验性的流动控制技术，用于研究喷射和抽吸作用下射流对共流射流翼型的影响，并与无射流情况进行比较。翼型为CFJ0025 - 065 - 196，基于翼型弦长的雷诺数为10。为测量流动的湍流分量，在风洞中使用了热线风速仪装置。本文分析了平均速度和边界层厚度对共流射流翼型的影响。针对两种不同的共流速度和不同攻角进行了测试。结果还表明，通过增加射流与主流之间的速度差，分离被延迟，并且在较高攻角下通过提高共流速度可以保持这种延迟。因此，这种流动控制方法具有良好的效率，并且有可能获得更高的升力系数和更低的阻力系数。