환경소음 저감을 위한 디퓨저가 장착된 분출형 소음기의 음향특성

다국어 초록 (Multilingual Abstract)

This study was undertaken to analyze the noise-reducing performance and back pressure characteristics of a diffuser fitted to a vent silencer used to reduce environmental noise when gas is vented at a power plant under conditions where the critical pressure ratio exceeds the threshold. After constructing an experimental device using an air compressor, the acoustic characteristics of the diffuser were measured and compared with a perforated plate. It was found that when gas was vented and the pressure ratio exceeded the threshold, the noise generated had a high-frequency component of 4~8 kHz and that when it had the same porosity, the noise level was high when the hole diameter was large. In addition, the diffuser had a back pressure of around 1/5 of that of the perforated plate. Therefore, when designing a vent silencer to reduce vent noise, a diffuser silencer with a small hole diameter would be expected to enable more effective noise control. In addition, it was confirmed that the back pressure can be calculated using a simple equation for a perforated plate when the back pressure is relatively large.