Research on the Sound Wave Propagation Law of Right-angle Pipe Bending Based on COMSOL Software
Based on the theory of sound wave propagation,the Helmholtz equation of the sound wave at the pipe bending was established and derived.In order to study the sound wave propagation characteristics of pipe bending with different bending radius,the frequency domain analysis of the right-angle pipe bending with different bending radius was carried out based on the pressure acoustic module in COMSOL Multophysics software.The analysis results show that the bending radius has a significant effect on the acoustic scattering coefficient and transmission loss in the bending.In the bending with a larger bending radius,the acoustic scattering effect is weaker and the transmission loss is smaller.On the contrary,the transmission loss in the smaller bending radius is higher due to the large curvature.In low-frequency bending,the acoustic wavelength is larger than the bending radius of the pipe,and the scattering coefficient and transmission loss are small;in high-frequency bending,due to the acoustic wavelength close to or smaller than the bending radius of the pipe bending,the scattering coefficient and transmission loss are large.
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