Abstract
The tube-bank exhaust gas economizer is usually composed of a series of tubes arranged in a rectangular duct. The tube arrays in cross flow sometimes excite the acoustical vibrations of sound fields in the duct of the exhaust gas economizer. It is very important, for practical applications, to understand the conditions of the acoustical resonances in the duct with the tube bundles. The resonances occur when the frequencies of the flow periodicities inside the array coincide with those of the acoustical modes. At resonances, the intense pure tone noises, which may reach 120 dB, are produced. The acoustic modes typically excited are those related to the dimension perpendicular to both the fluid flow direction and the tube axes. Acoustical resonance in the economizer tube arrays has been suppressed by detuning the resonance with baffles that shift the acoustic natural frequency upwards. We have successfully employed a single baffle to suppress resonance.
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