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

Experimental Investigation of a Hollow Cone Spray Using Laser Diagnostics

[+] Author and Article Information
Mithun Das

Power Engineering Department,
Jadavpur University,
Kolkata 700098, India
e-mail: mdas190@gmail.com

Souvick Chatterjee

Mechanical Engineering Department,
Jadavpur University,
Kolkata 700032, India
e-mail: souvickchat@gmail.com

Achintya Mukhopadhyay

Mechanical Engineering Department,
Jadavpur University,
Kolkata 700032, India
e-mail: achintya.mukho@gmail.com

Swarnendu Sen

Mechanical Engineering Department,
Jadavpur University,
Kolkata 700032, India
e-mail: sen.swarnendu@gmail.com

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 11, 2014; final manuscript received January 16, 2014; published online February 18, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(7), 071504 (Feb 18, 2014) (5 pages) Paper No: GTP-14-1019; doi: 10.1115/1.4026549 History: Received January 11, 2014; Revised January 16, 2014

Atomization of fuel is a key integral part for efficient combustion in gas turbines. This demands a thorough investigation of the spray characteristics using innovative and useful spray diagnostics techniques. In this work, an experimental study is carried out on a commercial hollow cone nozzle (Lechler) using laser diagnostics techniques. A hollow cone spray is useful in many applications because of its ability to produce fine droplets. But apart from the droplet diameter, the velocity field in the spray is also an important parameter to monitor and has been addressed in this work. Kerosene is used as the test fuel, which is recycled using a plunger pump providing a variation in the injection pressure from 100 to 300 psi. An innovative diagnostic technique used in this study is through illumination of the spray with a continuous laser sheet and capturing the same with a high speed camera. A ray of a laser beam is converted to a planer sheet using a lens combination which is used to illuminate a cross section of the hollow cone spray. This provides a continuous planar light source which allows capturing high speed images at 285 fps. The high speed images thus obtained are processed to understand the nonlinearity associated with disintegration of the spray into fine droplets. The images are shown to follow a fractal representation and the fractal dimension is found to increase with rise in injection pressure. Also, using PDPA, the droplet diameter distribution is calculated at different spatial and radial locations at a wide range of pressure.

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References

Figures

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Fig. 1

Schematic of the nozzle and top view of the swirl grooves

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Fig. 2

Schematic of the experimental setup for high speed imaging

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Fig. 3

Schematic setup with the phase Doppler particle analyzer (PDPA)

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Fig. 4

Snapshot of the PDPA Setup with (inset) hollow cone nozzle

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Fig. 5

(top) A typical high speed spray image with the cone angle (bottom) influence of injection pressure on spray cone angle

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Fig. 6

Variation of the spray patternation with increasing axial distance from the nozzle exit (100 psi) (h denotes axial length from the nozzle exit)

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Fig. 7

N(r) versus r for (a) 100 psi, (b) 200 psi, and (c) 300 psi pressure

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Fig. 8

Variation of fractal dimension with pressure

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Fig. 9

Diameter distribution with change of pressure (top) and diameter distributions at three different pressures (bottom) for 50 mm height from the nozzle tip

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Fig. 10

Diameter distribution with change of height (top) and diameter distributions at three different heights (bottom) for pressure of 200 psi

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Fig. 11

Mean radial velocity variation for different injection pressures

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Fig. 12

Mean radial velocity variation at different axial locations at a pressure of 300 psi

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