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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Method of Identifying Injector Coking From the Spray Field of Mechanical and CRDi Injectors Using Intensity of Scattered Light

[+] Author and Article Information
Ronith Stanly

Functional Fluids Laboratory,
3M India Limited,
No. 48-51, Electronics City,
Bangalore 560100, India
e-mail: ronithstanly@yahoo.com

Gopakumar Parameswaran

Functional Fluids Laboratory,
3M India Limited,
No. 48-51, Electronics City,
Bangalore 560100, India
e-mail: gopa@mmm.com

Bibin Sagaram

Functional Fluids Laboratory,
3M India Limited,
No. 48-51, Electronics City,
Bangalore 560100, India
e-mail: bibin.sagaram@gmail.com

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 22, 2017; final manuscript received July 7, 2017; published online October 10, 2017. Assoc. Editor: Nadir Yilmaz.

J. Eng. Gas Turbines Power 140(2), 021503 (Oct 10, 2017) (7 pages) Paper No: GTP-17-1109; doi: 10.1115/1.4037869 History: Received March 22, 2017; Revised July 07, 2017

The influence of injector coking deposits on the spray field of single-hole mechanical port fuel injectors and multihole common rail direct injection (CRDi) injectors was studied using light scattering technique coupled with image processing and analysis. Instead of employing the traditional accelerated coking process to study injector spray field deterioration, in-service injectors were selected and cleaned using a commercial fuel system cleaning procedure. Variation in atomization characteristics of coked and cleaned injectors were observed based on the spatial distribution of fine, medium, and coarse droplets in the near-field region of the injector spray zone and analyzed as a function of the intensity of scattered light. The improvement in the atomization perceived by this method was compared with traditional techniques like spray cone angle measurement, speed characterization of spray jets, and weight reduction of injector nozzles and needles. It was observed that after the fuel system cleaning procedure, a reduction in the number of coarse droplets in the near-field region and an increase in the number of medium and finely sized droplets was observed, suggesting better atomization of fuel in the near field spray zone.

Copyright © 2018 by ASME
Topics: Ejectors , Sprays , Drops
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References

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Figures

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Fig. 1

View of the dark-room setup for single-hole mechanical injectors with the camera shown at the two interchangeable locations

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Fig. 2

View of the dark-room setup for CRDi injectors

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Fig. 3

The raw image being cut into three distinct regions and named in the increasing order of their distances from the injector

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Fig. 4

Amount of least atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 5

Amount of medium atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 6

Amount of best atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 7

Grayscale image with clogged injector; before background was subtracted

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Fig. 8

Grayscale image with the cleaned injector; before background was subtracted

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Fig. 9

The raw image cut into three distinct regions, namely 1, 2, and 3 (left to right) with increasing radial distances from the injector

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Fig. 10

Amount of least atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 11

Amount of medium atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 12

Amount of best atomized droplets expressed as a percentage of the total amount of droplets in the spray

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Fig. 13

Spray cone angles of the coked and cleaned injectors

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Fig. 14

Speed of jets of the coked and cleaned injectors

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Fig. 15

Raw images of injector 1 in the coked (left) and cleaned (right) conditions. The variation in the standard deviation of jets can be clearly understood if the top left spray jet is examined.

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Fig. 16

Variation of standard deviation of spray jet lengths in the coked and cleaned conditions

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Fig. 17

Variation of weight of injector needles in the coked and cleaned conditions

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Fig. 18

Variation of weight of injector nozzles in the coked and cleaned conditions

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