2つの並列管群ダクトを有するガス加熱器の異音に関する研究 : 第1報,現象の把握(流体工学,流体機械)

概要

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This paper describes a High SPL sound generated from banks of gas heater tubes in two ducts with an internal flow which are located parallel to each other and used in a boiler. In this experiment, two banks have either of two kinds of tubes with diameter of 6mm or 3mm. The sound pressure and the flow velocity are measured in order to clarify the generation mechanism of the High SPL sound. First, the relation between the velocity and the sound pressure level (SPL) is examined. Second, the acoustic modes of the ducts are calculated by FEM. Finally, the effect of various perforated baffle plates on the SPL is studied. As a result, it was found that the beat phenomenon occurs in the gas heater with two banks because of the existence of two different acoustic modes which frequencies are very close to each other and the perforated baffle plates have a damping effect and the damping ability increases with the perforated ratio being smaller.
一般社団法人日本機械学会の論文
2004-01-25