The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet

Can Ruan, Fei Xing, Yue Huang, Xinyi Yu, Jiacheng Zhang and Yufeng Yao
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Can Ruan: School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Fei Xing: School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Yue Huang: School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Xinyi Yu: School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Jiacheng Zhang: School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Yufeng Yao: Department of Engineering Design and Mathematics, University of the West of England, Bristol BS16 1QY, UK

Energies, 2017, vol. 10, issue 1, 1-15

Abstract: This paper presents an experimental and theoretical study on the effects of an acoustic field induced by Hartmann Resonance Tube (HRT) on droplet deformation behavior. The characteristics of the acoustic field generated by HRT are investigated. Results show that the acoustic frequency decreases with the increase of the resonator length, the sound pressure level (SPL) increases with the increase of nozzle pressure ratio (NPR), and it is also noted that increasing resonator length can cause SPL to decrease, which has rarely been reported in published literature. Further theoretical analysis reveals that the resonance frequency of a droplet has several modes, and when the acoustic frequency equals the droplet’s frequency, heightened droplet responses are observed with the maximum amplitude of the shape oscillation. The experimental results for different resonator cavity lengths, nozzle pressure ratios and droplet diameters confirm the non-linear nature of this problem, and this conclusion is in good agreement with theoretical analysis. Measurements by high speed camera have shown that the introduction of an acoustic field can greatly enhance droplet oscillation, which means with the use of an ultrasonic atomizer based on HRT, the quality of atomization and combustion can be highly improved.

Keywords: Hartmann resonance tube; ultrasonic atomizer; atomization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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