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Research Papers: Fuel Combustion

Fundamental Study of Spray and Partially Premixed Combustion of Methane/Air Mixture

[+] Author and Article Information
Omid Askari

Department of Mechanical Engineering,
Sharif University of Technology,
Tehran, 11155-8639, Iran
e-mail: o_asgari@mech.sharif.edu

Hameed Metghalchi

Department of Mechanical and
Industrial Engineering,
Northeastern University,
Boston, MA 02115
e-mail: metghalchi@coe.neu.edu

Siamak Kazemzadeh Hannani

Department of Mechanical Engineering,
Sharif University of Technology,
Tehran, 11155-8639, Iran
e-mail: hannani@sharif.edu

Ali Moghaddas

Department of Mechanical and
Industrial Engineering,
Northeastern University,
Boston, MA 02115
e-mail: moghaddas.a@neu.edu

Reza Ebrahimi

Department of Aerospace Engineering,
KNTU University of Technology,
Tehran, 19991-43344, Iran
e-mail: rebrahimi@kntu.ac.ir

Hadis Hemmati

Department of Mechanical Engineering,
IAUCTB University,
Tehran, 14168-94351, Iran
e-mail: hadismech@gmail.com

Contributed by the Internal Combustion Engine Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received April 30, 2012; final manuscript received October 6, 2012; published online December 19, 2012. Assoc. Editor: Kevin M. Lyons.

J. Energy Resour. Technol 135(2), 021001 (Dec 19, 2012) (9 pages) Paper No: JERT-12-1093; doi: 10.1115/1.4007911 History: Received April 30, 2012; Revised October 06, 2012

This study presents fundamentals of spray and partially premixed combustion characteristics of directly injected methane in a constant volume combustion chamber (CVCC). The constant volume vessel is a cylinder with inside diameter of 135 mm and inside height of 135 mm. Two end of the vessel are equipped with optical windows. A high speed complementary metal oxide semiconductor (CMOS) camera capable of capturing pictures up to 40,000 frames per second is used to observe flow conditions inside the chamber. The injected fuel jet generates turbulence in the vessel and forms a turbulent heterogeneous fuel–air mixture in the vessel, similar to that in a compressed natural gas (CNG) direct-injection (DI) engine. The fuel–air mixture is ignited by centrally located electrodes at a given spark delay timing of 1, 40, 75, and 110 ms. In addition to the four delay times, a 5 min waiting period was used in order to make sure of having laminar homogeneous combustion. Spray development and characterization including spray tip penetration (STP), spray cone angle (SCA), and overall equivalence ratio were investigated under 30–90 bar fuel pressures and 1–5 bar chamber pressure. Flame propagation images and combustion characteristics were determined via pressure-derived parameters and analyzed at a fuel pressure of 90 bar and a chamber pressure of 1 bar at different stratification ratios (S.R.) (from 0% to 100%) at overall equivalence ratios of 0.6, 0.8, and 1.0. Shorter combustion duration and higher combustion pressure were observed in direct injection-type combustion at all fuel air equivalence ratios compared to those of homogeneous combustion.

Copyright © 2013 by ASME
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References

Figures

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Fig. 2

Experimental arrangement

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Fig. 1

Cross-sectional view of constant volume combustion chamber

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Fig. 3

Comparison of the overall equivalence ratio for various fuel pressures at chamber pressure 1 bar as a function of injection duration

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Fig. 4

Comparison of the overall equivalence ratio for various chamber pressures at fuel pressure of 90 bars as a function of injection duration

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Fig. 5

Definitions of STP and SCA

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Fig. 6

A sequence of Schlieren images of methane spray process

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Fig. 15

Main combustion duration versus stratification ratio at different spark delay timings, (a) Ф = 0.6 and (b) Ф = 1.0

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Fig. 11

(a) Pressure and (b) rate of pressure rise at different spark delay timing and overall equivalence ratio 0.8

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Fig. 12

Peak pressure versus stratification ratio at different spark delay timings, (a) Ф = 0.6 and (b) Ф = 1.0

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Fig. 13

Maximum rate of pressure rise versus stratification ratio at different spark delay timings, (a) Ф = 0.6 and (b) Ф = 1.0

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Fig. 14

Initial combustion duration versus stratification ratio at different spark delay timings, (a) Ф = 0.6 and (b) Ф = 1.0

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Fig. 7

(a) Spray tip penetration and (b) spray cone angle under different injection pressures and chamber pressure 1 bar as a function of time

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Fig. 8

(a) Spray tip penetration and (b) spray cone angle under different chamber pressures and injection pressure 90 bars as a function of time

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Fig. 9

Snapshots of methane/air combustion for stratification ratio of 100% and overall equivalence ratio of 0.8 as a function of spark delay timing (Tsd)

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Fig. 10

Snapshots of methane/air combustion for spark delay timing of 1 ms and overall equivalence ratio of 0.8 as a function of S.R.

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