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Energies 2017, 10(1), 48;

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

School of Aerospace Engineering, Xiamen University, Xiamen 361005, Fujian, China
Department of Engineering Design and Mathematics, University of the West of England, Bristol BS16 1QY, UK
Author to whom correspondence should be addressed.
Academic Editors: Antonio Ficarella and Maria Grazia De Giorgi
Received: 21 October 2016 / Revised: 25 December 2016 / Accepted: 29 December 2016 / Published: 4 January 2017
(This article belongs to the Special Issue Combustion and Propulsion)
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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. View Full-Text
Keywords: Hartmann resonance tube; ultrasonic atomizer; atomization Hartmann resonance tube; ultrasonic atomizer; atomization

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Ruan, C.; Xing, F.; Huang, Y.; Yu, X.; Zhang, J.; Yao, Y. The Influence of Acoustic Field Induced by HRT on Oscillation Behavior of a Single Droplet. Energies 2017, 10, 48.

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