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TECHNICAL PAPERS: Internal Combustion Engines

Computational Modeling of Natural Gas Injection in a Large Bore Engine

[+] Author and Article Information
Gi-Heon Kim, Allan Kirkpatrick, Charles Mitchell

Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523

J. Eng. Gas Turbines Power 126(3), 656-664 (Aug 11, 2004) (9 pages) doi:10.1115/1.1762906 History: Received October 01, 2002; Revised December 01, 2003; Online August 11, 2004
Copyright © 2004 by ASME
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References

Figures

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Axisymmetric cylinder mesh for Type A poppet valve
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Methane mole fraction and velocity magnitude for Type A poppet valve, (a–c) 4 bar injection, (d–f) 35 bar injection. (a) 1 ms after SOI, (b) 4 ms, (c) 7 ms, (d) 1 ms after SOI, (e) 2 ms, (f) 3 ms.
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Flow structures downstream of the Type A valve with 4 bar fuel injection. (a) 2 ms after SOI, (b) 7 ms after SOI.
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Development of flow structures downstream of the Type A valve with 35 bar fuel injection; (a) 0.6 ms after SOI, (b) 1.2 ms, (c) 1.8 ms, (d) 2.4 ms, (e) 3.0 ms
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Steady-state flow past Type A poppet valve, (a–d) 4 bar injection, (e–h) 35 bar injection. (a) Computational mesh, (b) Mach number contours, (c) static pressure contours, (d) cylinder pressure contour, (e) computational mesh, (f) Mach number contours, (g) static pressure contours, (h) cylinder pressure contour.
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Mesh for simulation of off-engine PLIF tests
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Comparison of PLIF results and CFD with 4 bar injection
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Comparison of PLIF results and CFD with 35 bar injection
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Contours of static pressure and Mach number with corresponding axial profiles with 4 bar injection, steady flow computation
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Contours of static pressure and Mach number with corresponding axial profiles for 35 bar injection, steady flow computation
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Axial velocity (a–b) and momentum (c–d) profiles in radial direction at seven equally spaced downstream locations (a) 4 bar injection, (b) 35 bar injection, (c) 4 bar injection, (d) 35 bar injection
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Mass and energy flow rates along axial locations. Mass flow rate—(•) 4 bar injection, (○) 35 bar injection; kinetic energy flow rate—(▪) 4 bar injection, (□) 35 bar injection; enthalpy flow rate—(▴) 4 bar injection, (▵) 35 bar injection.
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Axisymmetric mesh for moving piston simulations
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Mixing fraction profiles with 4 bar injection. (a) Flammable mixture fraction, (b) flammable fuel fraction.
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Mixing fraction profiles with 35 bar injection. (a) Flammable mixture fraction, (b) flammable fuel fraction.
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Flammable mixture fractions at TDC as a function of injected fuel mass
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Contours of methane mole fraction at TDC. (a) 4 bar injection, (b) 35 bar injection.
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Contours of turbulent kinetic energy (m2 /s2 ) at TDC. (a) 4 bar injection, (b) 35 bar injection.

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