Abstract
This paper deals with the acoustic resonance in tube bundles which occurred in actual boiler plants. In-situ measurements revealed that besides the lift-force directional modes, drag-force directional modes which are difficult to suppress, are generated. In order to suppress both types of resonant modes, acoustic absorbers are adopted which are equipped mid-air in the duct. This phenomena is classified as self-exited oscillation and based on the stability criterion, its design method, including the number or placement of absorbers in the duct space for efficient performance, was developed with the use of acoustic FEM. In order to validate this method, scale model test was executed and the same phenomena as those in the actual plant were realized. In the next step acoustic energy absorbers are equipped in the duct and remarkable increase of the critical flow velocity was confirmed. Finally this method was applied to the actual boiler plant and based these results, it was confirmed that the proposed method is the effective countermeasure for the anti-acoustic resonance in heat exchangers.
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