声激励增升效应研究

Investigation on Effects on Enhancing Lift by Acoustic Excitation

二元后台阶低速风洞实验表明,用内部声激励控制脱落旋涡能够获得有利的增升效应。实验还得出激励频率、旋涡自然脱落主频及旋涡脱落主频之间的关系;并给出了模型表面压力随声压级及频率变化的规律。本文将对二元翼型及三角翼等内部声激励的应用研究提供有价值的实验结果。

A low-speed wind tunnel test shows that beneficial effects on enhancing lift can be obtained by using internal acoustic excitation to control the shedding vortices.The relations among the excited frequency, the main vortex naturnally shedding frequency and the main vortex shedding frequency are given. Regularities of pressure on surface with sound pressure level and frequency are also given. This paper provides valuable experimental results for the applied study of internal acoustic excitation of a two-dimensional airfoil or a delta wing.