소음 저감용 배플 개수 변화에 따른 배기 스택 시스템 내부 유동 특성에 관한 고정밀도 LBM 해석

초록

This study investigates the internal flow characteristics of an industrial exhaust stack as a preliminary step toward mitigating noise emissions from power generation and manu- facturing facilities in urban environments. While previous research on silencer design has explored various flow-modifying devices, including baffles, vanes, and honeycomb structures, this work focuses on the aerodynamic effects of baffle number within the stack. Two configurations with different baffle counts, denoted B9 and B17, were examined to evaluate their influence on internal flow development, outlet flow propagation, and external dispersion behavior. In this study, very large eddy simulations (VLES) based on the lattice Boltzmann method (LBM) were conducted to resolve unsteady flow structures. In the B9 case, the reduced baffle density allowed for continuous flow development with minimal resistance, resulting in enhanced vertical momentum and strong upward propagation at the outlet. In contrast, the B17 configuration exhibited significant flow deceleration, restricted flow channels, and prominent recirculation zones between adjacent baffles. As a result, exhaust jet flow beyond 7 meters from the outlet was only observed in the B9 configuration. These findings demonstrate that the number of internal baffles critically influences the momentum transfer and far-field dispersion characteristics of exhaust stack flows, offering valuable insights for the aerodynamic optimization of noise control devices.

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