Research Papers

Effect of Geometric Parameters on Mean Drop Sizes From Dual-Orifice Pressure Nozzles

[+] Author and Article Information
Xiao Wei

Department of Combustion Research,
AECC Hunan Aviation Powerplant
Research Institute,
Zhuzhou 421000, China
e-mail: csubeggar@163.com

Guo Zhengyan

Department of Combustion Research,
AECC Hunan Aviation Powerplant
Research Institute,
Zhuzhou 421000, China
e-mail: capi2017@163.com

Chen Pimin

Department of Combustion Research,
AECC Hunan Aviation Powerplant
Research Institute,
Zhuzhou 421000, China
e-mail: chenpimin03@163.com

Manuscript received February 11, 2018; final manuscript received July 17, 2018; published online October 31, 2018. Assoc. Editor: Eric Petersen.

J. Eng. Gas Turbines Power 141(2), 021034 (Oct 31, 2018) (6 pages) Paper No: GTP-18-1061; doi: 10.1115/1.4041079 History: Received February 11, 2018; Revised July 17, 2018

Experimental studies have been conducted to investigate the effect of nozzle geometries on the atomization. Extensive measurements of mean drop size are conducted on the 15 dual-orifice pressure nozzles. These nozzles provide a range of discharge coefficient from 0.06 to 0.13. These experimental results are used to substantiate a semi-empirical correlation derived for determining the Sauter mean diameter (SMD) of sprays generated by dual-orifice pressure nozzles. The correlation is obtained by modeling the liquid internal and outer flow that govern the atomization process in dual-orifice pressure nozzles. A very satisfactory agreement is demonstrated between the predictions based on the correlations and the actual measured values of the SMD.

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Fig. 1

Schematics of the dual-orifice pressure nozzle

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Fig. 2

Breakup of coaxial spray sheet

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Fig. 3

Schematics of test facilities

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Fig. 4

Relationship between pressure differential and uncertainties in SMD measurement

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Fig. 5

Relationship between SMD, injection pressure differential and tangential ports area of pilot nozzles

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Fig. 6

Relationship between SMD, injection pressure differential and tangential ports area of main nozzles

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Fig. 7

Relationship between SMD and converging half-angle of the pilot nozzle

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Fig. 8

Relationship between of SMD and converging half-angle of the main nozzle

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Fig. 9

Relationship between SMD and l1/d1 of pilot nozzles

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Fig. 10

Relationship between SMD and l2/d2 of main nozzles

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Fig. 11

Relationship between SMD and mass flow ratio (discharge coefficient CD = 0.115)

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Fig. 12

Dual-orifice pressure nozzle internal flow and breakup schematic diagram

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Fig. 13

Comparisons of predicted SMD and measured SMD for dual-orifice pressure nozzles



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