Biwa Tetsushi, Tashiro Yusuke, Nomura Hiroshi, Ueda Yuki, Yazaki Taichi
Department of Mechanical Systems and Design, Tohoku University, Sendai, Japan.
Rev Sci Instrum. 2007 Aug;78(8):086110. doi: 10.1063/1.2768929.
The use of two pressure sensors [Fusco et al., J. Acoust. Soc. Am. 91, 2229 (1992)] makes it possible to determine the acoustic intensity of a gas column in a duct, but the application of this method was limited to wide ducts. In this letter, the formulation of the method is modified to include narrow ducts where the duct radius is as small as the viscous boundary layer thickness of the gas. The validity of this method is shown by comparison with the direct measurements of the pressure and velocity.
使用两个压力传感器[福斯科等人,《美国声学学会杂志》91, 2229 (1992)]可以确定管道中气体柱的声强,但该方法的应用仅限于宽管道。在这封信中,对该方法的公式进行了修改,以包括管道半径小至气体粘性边界层厚度的窄管道。通过与压力和速度的直接测量结果进行比较,证明了该方法的有效性。