高速射流冲击噪声机理的研究

Study on noise mechanism caused by high-speed impinging jet is one of.key issue in aeroacoustics. It has a widely applied foreground. The structure of flow field and noise of impinging jet have been researched by experiments and simulations. It found that there was a correlation between impinging tone and oscillation of flow field. It also demonstrated that the feedback acoustics wave propagated upstream to the nozzle.exit region from the outside of supersonic jet. It further showed the noise mechanism.of high-speed impinging jet. It can supply theoretic foundation for reducing noise.

高速射流冲击噪声机理的研究是气动噪声研究的热点问题，具有广泛的应用前景。课题计划从实验和数值模拟两方面着手，研究高速射流冲击平板所形成的复杂流场和声场，探寻流场和声场的相关性，特别是相干结构对冲击噪声的贡献，以揭示高速射流冲击噪声的机理，寻求噪声与射流马赫数，冲击距离以及冲击角度的关系，为冲击射流降噪研究提供理论基础。