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Fluctuation Characteristics of Spray Velocity Field of Coaxial Convergent Nozzle by Particle-Image-Velocimetry Measurements

[+] Author and Article Information
Cong Du1

 Hebei University of Technology, Tianjin, Chinaducong@hebut.edu.cn

Jian-Zhong Liu, Zhen-Yu Huang, Jun-Hu Zhou, Ke-Fa Cen

State Key Laboratory of Clean Energy Utilization,  Zhejiang University, Hangzhou, Zhejiang, China

Lian-Sheng Liu

 Hebei University of Technology, Tianjin, China

1

Corresponding author.

J. Fluids Eng 134(6), 064501 (Jun 11, 2012) (8 pages) doi:10.1115/1.4006172 History: Received March 18, 2011; Revised December 07, 2011; Published June 11, 2012; Online June 11, 2012

Coaxial elements and annular liquid jets are normally utilized in industrial applications to generate sprays. A particle image velocimetry investigation on the transient characteristics of the spray velocity field of a coaxial convergent nozzle is carried out in this paper. Based on the measurement results, spectrum analysis is performed to detect the process of atomization in the spray. Experimental results show that at large gas jet velocities, the process of generation of droplets is controlled mainly by the dynamics of liquid ligaments, and the power spectrum reveals that the velocity fluctuations are superimposed on the transient flow field by the effect of the shear layer instability. With the increase of gas velocity, the fluctuations of the spray velocity develop progressively to higher frequencies.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Liquid breakup model (a) Liao’s model; (b) Marmottant’s model

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Figure 2

PIV experimental system

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Figure 3

Ligament tip diameter at different gas jet velocities

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Figure 4

Effect of central gas stream velocity and liquid flow rate on the spray velocity field and the corresponding shadowgraph

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Figure 5

3D streamwise velocity map at liquid flow rate of 8.2 g/s and different cenral gas jet velocities. (a) u2  = 64 m/s, (b)u2  = 176m/s.

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Figure 6

Impact of central gas jet velocity on the streamwise velocity along the spray centerline

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Figure 7

3D streamwise velocity map at liquid rate of 8.2 g/s and different outer annular gas jet velocities. (a) u2  = 60m/s (b) u2  = 124m/s.

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Figure 8

Impact of outer annular gas jet velocity on the streamwise velocity along the centerline

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Figure 9

Impact of outer annular gas jet velocity on the cross-stream velocity within the main-stream

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Figure 10

Impact of gas jet velocity on the peak frequency

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