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Research Papers

Investigation of the Effect of Cavitation in Nozzles With Different Length to Diameter Ratios on Atomization of a Liquid Jet

[+] Author and Article Information
Belkacem Abderrezzak

National Key Laboratory of Science and
Technology on Aero-Engines,
Collaborative Innovation Center of Advanced
Aero-Engines,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: b_abderrezzak@buaa.edu.cn

Yong Huang

National Key Laboratory of Science and
Technology on Aero-Engines,
Collaborative Innovation Center
of Advanced Aero-Engines,
School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: yhuang@buaa.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received June 12, 2016; final manuscript received March 8, 2017; published online April 21, 2017. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 9(3), 031014 (Apr 21, 2017) (11 pages) Paper No: TSEA-16-1169; doi: 10.1115/1.4036438 History: Received June 12, 2016; Revised March 08, 2017

This study was conducted to investigate the effect of cavitation on liquid jet atomization characteristics in nozzles of different length to diameter (L/D) ratios. For this purpose, a spray test facility with an ambient pressure chamber was constructed, and sprays were recorded using a high-speed camera for a wide range of conditions, which provided complete characterization of the orifice flow fields and the emerging jet. Collapse length measurements are provided and indicate the complex nature of the nozzle flow. Extensive discharge coefficient measurements for each nozzle are also presented. Finally, the influence of the length to diameter ratio on cavitation and subsequently on the spray structure is also addressed.

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References

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Figures

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Fig. 1

Experimental apparatus

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Fig. 2

Nozzle flow characteristics (L/D = 2)

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Fig. 3

Nozzle flow characteristics (L/D = 4)

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Fig. 4

Nozzle flow characteristics (L/D = 6)

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Fig. 5

Nozzle flow characteristics (L/D = 8)

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Fig. 6

Relationship between flow rate and injection pressure

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Fig. 7

Variation of cavitation number with Reynolds number and Weber number: (a) Reynolds number and (b) Weber number

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Fig. 8

Comparison of cavitation critical numbers for different length to diameter ratios

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Fig. 9

Cavitation hysteresis within nozzles of different length to diameter ratios

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Fig. 10

Influence of the square root of the cavitation number on the discharge coefficient

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Fig. 11

Cavitation collapse length for nozzles with different length to diameter ratios: (a) cavitation collapse length variation with K and (b) a schematic definition of the cavitation collapse length

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Fig. 12

Representative images of spray structure of (L/D = 2) nozzle

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Fig. 13

Representative images of spray structure of (L/D = 4) nozzle

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Fig. 14

Representative images of spray structure of (L/D = 6) nozzle

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Fig. 15

Representative images of spray structure of (L/D = 8) nozzle

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Fig. 16

Near nozzle spray angle variation with cavitation: (a) spray angle variation with the cavitation number and (b) spray angle variation with the cavitation collapse length

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Fig. 17

Nozzle flow and spray formation sequences for developing cavitation (K = 1.19). Time between images 1.6 ms.

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Fig. 18

Nozzle flow and spray formation sequences for supercavitation (K = 1.19). Time between images 1.6 ms.

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