음향 카메라를 이용한 가스 파이프라인 볼밸브 유동소음 특성

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 28; no. 1; pp. 106 - 112
• Main Authors: 김철규(Chul-kyu Kim), 이상문(Sang-moon Lee), 장춘만(Choon-man Jang)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2017
• Subjects: 기계공학; Sound pressure level; 음향 카메라; 가스 파이프라인; Flow induced noise; Gas pipeline; 유동소음; Acoustic camera; 음압 레벨; Ball valve; 볼밸브
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/KHNES.2017.28.1.106

The present study describes flow induced noise generated from a ball valve used for a gas pipeline. Noise generation from a ball valve mainly induces by interference between unstable(or fluctuating) leakage flow and pipe wall when the ball valve is working closed or opened. To measure the positions of the noise source and the amplitude of noise with respect to measuring frequencies, a commercial acoustic camera is introduced. Noise characteristics generated by the ball valve have been performed by four valve opening rates: 30, 50, 70 and 100 percents. It is noted that 100 percent opening rate means that the valve is fully opened. Throughout the experimental measurements using the acoustic camera, the location of the noise source and the noise amplitude with respect to the frequencies for the test ball valve are clearly evaluated. It is found that the dominant frequencies come from the fluctuating flow at the downstream of the ball valve for four opening rates are observed between 3,000Hz and 3,200Hz. Maximum noise amplitude comes from the ball valve reaches 75dB at the valve opening rate of 50 percent.