A CFD Study of Fuel Evaporation and Related Thermo-fluid Dynamics in the Inlet Manifold, Port and Cylinder of the CFR Octane Engine

Thiart, Anja; Floweday, Gareth; Meyer, Chris J.

doi:10.4271/2012-01-1715

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…The engine's tumble plates were removed from the intake ports to maximize volumetric efficiency, reduce pumping work, and achieve a low tumble ratio for the tests studied in this work. A detailed description of the engine set-up can be found in [20][21][22] while a summary of pertinent instrumentation devices is provided in Table A4 in the Appendix. This engine will be referred to as the LD-SI (Light-Duty Spark Ignition) engine.…”

Section: Experimental Setupsmentioning

confidence: 99%

Determination of a most representative cycle from cylinder pressure ensembles via statistical method using distribution skewness

Gonzalez

Hall

Kolodziej

2021

International Journal of Engine Research

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In internal combustion engine research, cylinder pressure measurements provide valuable information about the underlying thermodynamic and combustion processes, and are typically collected in ensembles of several 100 traces. Although in some particular fields of combustion research all traces are analyzed, in most cases only one trace is studied because analyzing all the traces is impractical due to the large number of collected samples. Instead, an ensemble-averaged pressure trace is commonly calculated and used for analysis. However, this pressure trace is highly smoothed and dynamic information is lost during the averaging process. With the average trace, pressure rise rates are lower and pressure oscillations such as the ones resulting from combustion knock are lost. In this work, a statistical method was developed to determine the “most representative cycle,” which is the cycle from the ensemble that has the pressure trace most representative of the engine operating condition. Eleven characteristic parameters are computed from each pressure trace and probabilistic distributions are obtained for each of the parameters using all the traces in the ensemble. Finally, the most representative cycle is selected by means of a cost function minimization. The benefits of this method are illustrated using experimental data from four very different engine platforms, under four different combustion modes and over a range of operating conditions.

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Section: Experimental Setupsmentioning

confidence: 99%

Determination of a most representative cycle from cylinder pressure ensembles via statistical method using distribution skewness

Gonzalez

Hall

Kolodziej

2021

International Journal of Engine Research

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“…Despite CFR engines being carbureted, 3-D CFD simulations assuming homogeneous gaseous fuel/air mixture have mostly been performed in literature. Although Thiart et al 37 have shown the existence of thermal and charge stratifications in the CFR engine, the 3-D CFD model was used for simulating only a single cycle in that study. 37 Therefore, the literature lacks information on real in-cylinder conditions within CFR engines.…”

Section: Introductionmentioning

confidence: 99%

“…Although Thiart et al 37 have shown the existence of thermal and charge stratifications in the CFR engine, the 3-D CFD model was used for simulating only a single cycle in that study. 37 Therefore, the literature lacks information on real in-cylinder conditions within CFR engines.…”

Section: Introductionmentioning

confidence: 99%

Fuel-air mixing in motored CFR engine at research octane number (RON) relevant condition

Bhattacharya,

Keskinen,

Larmi

et al. 2023

International Journal of Engine Research

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This paper presents a three-dimensional (3-D) computational fluid dynamics (CFD) study of a motored cooperative fuel research (CFR) engine at research octane number (RON) relevant condition. The boundary conditions for 3-D simulations were generated with a one-dimensional GT-Power model. For the first time in literature, a carburetor was added to a virtual CFR engine model with 3-D CFD. Therefore, the proposed setup can simulate the fuel and thermal stratifications inside the engine cylinder with realistic detail. The transient simulations in this work were performed within the Reynolds-averaged Navier-Stokes (RANS) framework with a Realizable k-ε turbulence model. Major conclusions from the present work are: (1) The in-cylinder flow of the CFR engine is swirl-dominated due to the existence of the intake valve shroud. (2) There is a significant amount of liquid droplets entering the cylinder during the intake stroke. The maximum instantaneous amount of liquid for 50% PRF 87 (containing 87% iso-octane and 13% n-heptane (v/v)) and 50% ethanol mixture is indicated to be around 26% of total injected fuel mass. (3) The heat of vaporization (HoV) of the fuel is responsible for creating both temperature and charge stratification inside the cylinder.

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Pressure and temperature effects on fuels with varying octane sensitivity at high load in SI engines

Szybist

Splitter

2017

Combustion and Flame

127

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A CFD Study of Fuel Evaporation and Related Thermo-fluid Dynamics in the Inlet Manifold, Port and Cylinder of the CFR Octane Engine

Cited by 8 publications

References 32 publications

Determination of a most representative cycle from cylinder pressure ensembles via statistical method using distribution skewness

Determination of a most representative cycle from cylinder pressure ensembles via statistical method using distribution skewness

Fuel-air mixing in motored CFR engine at research octane number (RON) relevant condition

Pressure and temperature effects on fuels with varying octane sensitivity at high load in SI engines

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