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《Transactions of the Chinese Society for Agricultural Machinery》 2015-01
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Time-frequency Characteristics of Acoustic Signal in Gas Flowing Process of Effervescent Spray Nozzle

Sun Chunhua;Ning Zhi;Lü Ming;Yan Kai;Fu Juan;College of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University;  
Adaptive optimal kernel( AOK) and Hilbert-Huang transform( HHT) marginal spectrum methods were introduced to process acoustic signals from effervescent atomizer. The time-frequency results reflected the information of bubble pressure,bubble size and gas-liquid mass ratio fluctuation which had significant impacts on spray. The experimental results showed that the outflow moment of bubble could be accurately captured by AOK time-frequency spectrum,and the pulsation of amplitude could reflect the gas-liquid mass ratio fluctuation. The Hilbert marginal spectrum power was concentrated in a short frequency range. The power-frequency distribution was affected by gas-liquid pressure and gasliquid mixture form. The Hilbert marginal spectrum power was symmetric with the center frequency which was positively correlated with bubble pressure,but little correlated with bubble size. Time-frequency analysis of acoustic signals from effervescent atomizer provides a new tactics for further study of the mechanism for effervescent atomization.
【Fund】: 国家自然科学基金资助项目(51276011);; 北京市自然科学基金资助项目(3132016);; 国家高技术研究发展计划(863计划)资助项目(2013AA065303);; 中央高校基本科研业务费专项资金资助项目(2013YJS068);; 内燃机燃烧学国家重点实验室开放基金资助项目(k2013-3)
【CateGory Index】: O35
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