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Research Papers: Fuel Combustion

The Role of Porous Media in Homogenization of High Pressure Diesel Fuel Spray Combustion

[+] Author and Article Information
Navid Shahangian

Laboratory for Turbulence Research in Aerospace
and Combustion (LTRAC),
Mechanical and Aerospace Engineering
Department,
Monash University,
Melbourne, VIC 3800, Australia
e-mail: navid.shahangian@monash.edu

Damon Honnery, Jamil Ghojel

Laboratory for Turbulence Research in Aerospace
and Combustion (LTRAC),
Mechanical and Aerospace Engineering
Department,
Monash University,
Melbourne, VIC 3800, Australia

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 8, 2012; final manuscript received May 15, 2013; published online September 12, 2013. Assoc. Editor: Timothy J. Jacobs.

J. Energy Resour. Technol 136(1), 012202 (Sep 12, 2013) (13 pages) Paper No: JERT-12-1230; doi: 10.1115/1.4024717 History: Received October 08, 2012; Revised May 15, 2013

Interest is growing in the benefits of homogeneous charge compression ignition engines. In this paper, we investigate a novel approach to the development of a homogenous charge-like environment through the use of porous media. The primary purpose of the media is to enhance the spread as well as the evaporation process of the high pressure fuel spray to achieve charge homogenization. In this paper, we show through high speed visualizations of both cold and hot spray events, how porous media interactions can give rise to greater fuel air mixing and what role system pressure and temperature plays in further enhancing this process.

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References

Figures

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Fig. 1

(a) PM engine concepts with open and (b) closed chamber configuration [12]

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Fig. 2

View of the permanent contact PM engine with PM reactor mounted in (a) cylinder head and (b) piston head [13,15]

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Fig. 3

Pore density of the porous ceramic used and pentagonal dodecahedron structure of the cells

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Fig. 4

Characteristic phases of spray interaction with a porous medium

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Fig. 5

Schematic view of the cold flow experimental setup

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Fig. 6

(a) A view of the chamber for combustion test, (b) top view of the chamber showing the mounted porous ceramic

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Fig. 7

(a) Contour plots of light intensity of a multi-jet structure leaving the porous ceramic of 20 PPI pore density; (b) subtracted result of background image from multi-jet structure flowing out of the porous medium; (c) and the results of edge detection method [23]

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Fig. 8

Instantaneous spray axial penetration and mean axial penetration of free spray against time from SOI at Pc = 50 bars.

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Fig. 9

Spray free evolution at Pi = 1000 bars and Pc at (a) 1 bars, (b) 10 bars, and (c) 50 bars depicted at different time frames after SOI (ms)

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Fig. 10

Spray interaction with porous ceramic media at Pi = 1000 bars and Pc at (a) 1 bars, (b) 10 bars, and (c) 50 bars depicted at different time frames after SOI (ms)

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Fig. 11

Variation of intensity in the vicinity of the spray flow in (a) phase B and (b) phase D at chamber pressure of Pc = 10 bars

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Fig. 12

Axial spray tip penetration and velocity of the free spray at chamber pressure conditions of Pc = 1, 10, and 50 bars

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Fig. 13

(a) Axial spray tip penetration, (b) axial spray tip velocity before and after interaction with porous media, respectively, in phase A and D at different chamber pressure conditions of Pc = 1, 10, 50 bars

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Fig. 14

Time sequences (ms) of free spray combustion after SOI in the CVC at PSOI = 25 bars and TSOI ≈ 1300 K. False colors used: Black and white colors represent low and high temperature, respectively.

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Fig. 15

Time sequences (ms) of spray combustion after SOI in the presence of the porous media at PSOI = 25 bars and TSOI 1070 K

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Fig. 16

Time sequences (ms) of spray combustion after SOI in the presence of the porous media at PSOI = 25 bars and TSOI ≈ 1300 K

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Fig. 17

(a) Pressure and (b) temperature traces of free spray and porous media experimental runs at two different temperature conditions. Time is referenced to SOI

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Fig. 18

(a) Cumulative gross heat release and gross heat release rate, (b) net heat release of free spray and porous media experimental runs at two different temperature conditions. Time is referenced to SOI

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Fig. 19

(a) Spray exiting surface of the PM, arrow length is 40 mm; (b) and (c) SEM observations of soot residue deposited on spray exiting surface of the PM in phase D at three magnification levels of × 60, 1000, and 100,000. (c) shows the enlarged image of indicated area in (b) of the ceramic strut.

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