摘要
在高声强下测量了微圆孔处声激发射流的速度和微圆孔的非线性声阻抗。随声压级的增加声激发射流的速度增大，实验中射流速度在 ０－１９ｍ／ｓ范围内变化，这表明出现一种强烈声整流现象；与此同时微圆孔声阻明显增大，而声抗减小，声抗最小值约是其线性值的０．７倍。此外实验结果还验证了一种微园孔声学非线性效应离散涡模型的合理性。
Both the velocity of the sound-excited jet flow at a small circular orifice and the nonlinear impedance of the orifice are measured at high sound intensity. As the sound pressure level is increased, the velocity of the sound-excited jet flow increases. In the present experiment the flow velocities in the orifice cover approximately the range of 0 to 19 m/s, thereby showing that a type of strong acoustic streaming occurs. Consequently the orifice resistance markedly increases with the increase of the SPL while the orifice reactance decreases to 0.7 of its linear value at its lowest point. Besides, the present experiment has verified one previous discrete vortex model of the acoustic nonlinearity of a circular orifice.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2001年第2期171-174,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目!(No.59925616)
航空基础科学基金资助项目!(No.00C51040)
关键词
声阻抗测量
声波
非线性性
声整流
实验
acoustic impedance measurement
acoustic nonlinearity
acoustic streaming
