On one method of estimating acoustical noises generated by a liquid flow in an elastic tube with stenosis

摘要

We considered a method of experimental estimation of acoustical noises generated by a liquid flow in an elastic tube with stenosis. The design of a measurement chamber was proposed and theoretically grounded. The design allows one to cut the distortions of measured statistical characteristics of noise significantly. These distortions can arise due to parasitic oscillations of the chamber and resonances of the liquid in the chamber. The article shows a fundamental way to estimate oscillations of the walls of an elastic tube using experimental data on acoustical noises. The device that allows one to implement the proposed method, was assembled and tested. It was shown, in particular, that with the other conditions being equal, the level of acoustical noise generated by turbulized flow in the presence of stenosis is significantly higher than the noise of a boundary layer in a tube in the absence of stenosis.