THE INVESTIGATION OF SOUND ATTENUATION BY TUBULAR HEAT EXCHANGER ARRAYS AND THE CORRESPONDING SOUND-REDUCING SPECTRUM

The acoustic propagation characteristics of boiler heat exchanger tube array are investigated based on the research methods about phononic crystals. Plane wave expansion method was used for numerical calculation to get the elastic band gap diagram of tube array (band structure), while the COMSOL software was used to simulate the sound propagation characteristics.Setting the transverse pitch, longitudinal pitch,pipe diameter size and other parameters of tube array that should be meet the economizer structure,making the band gap picture of elastic wave after the sound getting through tube array by MATLAB calculating and conducting a simulated experiment through the COMSOL software, finally the paper can get the influence of furnace tube to sound transmission. And work through experiments ,in order to offer new idea and method on processing acoustical signal in the power station boiler.