Enhanced heat release analysis for advanced multi-mode combustion engine experiments

Ortiz-Soto, Elliott; Lavoie, George A.; Martz, Jason; Wooldridge, Margaret S.; Assanis, Dennis N.

doi:10.1016/j.apenergy.2014.09.038

Cited by 37 publications

(22 citation statements)

References 53 publications

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“…4). The maximum curvature was calculated using the first and second derivatives of the heat release rate and has been used in previous studies [25,30,43] to define the transition point between flame propagation and auto-ignition in SACI combustion. It is assumed that the transition is instantaneous, and SACI combustion modeling [12] and SACI optical engine experiments [3,4] have indicated that this is a reasonable approximation.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the analysis as well as validation results can be referenced in Ortiz-Soto et al [30]. For each cycle, a modified Woschni heat transfer correlation [31] with variable mixture properties was used to calculate the gross rate of heat release and cumulative gross heat release.…”

Section: Data Acquisition and Combustion Analysismentioning

confidence: 99%

“…1. The KIVA simulations were configured to match the experimental operating conditions of interest and were initialized at 640°b TDC of combustion, during the expansion stroke of the previous engine cycle, using estimates of the thermodynamic state and composition from heat release analysis [30]. Boundary conditions in the intake and exhaust manifolds were imposed from the high speed manifold pressure measurements of the experiments.…”

Section: Modeling Frameworkmentioning

confidence: 99%

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On the sensitivity of low temperature combustion to spark assist near flame limit conditions

Olesky

Middleton

Lavoie

et al. 2015

Fuel

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h i g h l i g h t sThe effect of spark assist on air and EGR dilute HCCI combustion was examined. Spark had greater combustion advance effect on more air dilute (vs. EGR dilute) mixtures. Combustion advance was caused by an increased fraction of flame-based heat release. Flame quenching likely affected mixtures that showed a non-response to spark assist. a b s t r a c t Spark assisted compression ignition (SACI) is a practical mode for controlling the heat release rate of low temperature combustion (LTC). While flames are key phenomena in the SACI combustion process, they may not always be effective or viable under the mildly stratified and highly dilute low burned gas temperature conditions of LTC. To better understand the limits of flammability or flame effectiveness, this work explores combustion within a single cylinder direct injection engine near the high load limit of the HCCI combustion regime, where spark induced flame propagation has been seen to affect combustion phasing and heat release rate. Flame limiting conditions were identified using progressively more advanced spark timing, up to 120°before top dead center, for differing levels of air and EGR dilution while holding the chemical energy content of the charge constant. Under air dilute conditions, the measured combustion phasing advanced from 8°to 0°after top dead center with spark advance, while almost no effect was seen under EGR dilute conditions. Estimates of the experimental global and local state conditions were made at the time of spark using heat release analysis and a KIVA-3V engine model, respectively, and the flammability for each case was evaluated using the Karlovitz criterion. The results show that fuel rich stratification near the spark plug was likely responsible for the observed variations in the SACI flame behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Data Acquisition and Combustion Analysismentioning

confidence: 99%

Section: Modeling Frameworkmentioning

confidence: 99%

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On the sensitivity of low temperature combustion to spark assist near flame limit conditions

Olesky

Middleton

Lavoie

et al. 2015

Fuel

Self Cite

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“…The RGF can only be inferred through simulations or an estimation [2]. The difficulties in ascertaining the exact values of the initial conditions of the fuel-air mixture can lead to inaccuracy in model prediction and also analyses and interpretation of experimental data [3][4][5]. For instance, the authors of [6] report a very controlled experimental study on the effects of intake air humidity on the performance and emissions of a turbo-charged 4cylinder diesel engine at various engine speeds and loads.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Emissions to Uncertainties in Residual Gas Fraction Measurements in Automotive Engines: A Numerical Study

Aithal

2018

Journal of Combustion

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Initial conditions of the working fluid (air-fuel mixture) within an engine cylinder, namely, mixture composition and temperature, greatly affect the combustion characteristics and emissions of an engine. In particular, the percentage of residual gas fraction (RGF) in the engine cylinder can significantly alter the temperature and composition of the working fluid as compared with the air-fuel mixture inducted into the engine, thus affecting engine-out emissions. Accurate measurement of the RGF is cumbersome and expensive, thus making it hard to accurately characterize the initial mixture composition and temperature in any given engine cycle. This uncertainty can lead to challenges in accurately interpreting experimental emissions data and in implementing real-time control strategies. Quantifying the effects of the RGF can have important implications for the diagnostics and control of internal combustion engines. This paper reports on the use of a well-validated, two-zone quasi-dimensional model to compute the engine-out NO and CO emission in a gasoline engine. The effect of varying the RGF on the emissions under lean, near-stoichiometric, and rich engine conditions was investigated. Numerical results show that small uncertainties (~2–4%) in the measured/computed values of the RGF can significantly affect the engine-out NO/CO emissions.

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“…Extensive research on advanced ignition engines that operate lean or highly diluted through low temperature combustion (LTC) is currently of interest as this provides a means to reduce NOx emissions while maintaining fuel efficiency [1][2][3][4][5]. However, the combustion of lean and highly dilute mixtures is challenging to implement since as the mixture becomes increasing lean, the burning speed becomes much slower and combustion starts to become unstable [6].…”

Section: Introductionmentioning

confidence: 99%

A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization

2017

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Turbulent Jet Ignition is an advanced pre-chamber ignition enhancement technique for spark ignition engines that uses a discharging jet of hot combusting gases to initiate main chamber combustion. The jet acts as a distributed ignition source, leading to fast burn rates and increased combustion stability. Experiments were performed in an optically accessible rapid compression machine using liquid iso-octane to study the effects of auxiliary fuel injection and ignition distribution due to nozzle geometry. A custom low-flow fuel injector was used to overcome previous limitations of using liquid fuel in the pre-chamber. Jet induced autoignition behavior was also studied in depth by considering high-speed images, pressure traces, and pressure derivative data.

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Enhanced heat release analysis for advanced multi-mode combustion engine experiments

Cited by 37 publications

References 53 publications

On the sensitivity of low temperature combustion to spark assist near flame limit conditions

On the sensitivity of low temperature combustion to spark assist near flame limit conditions

Sensitivity of Emissions to Uncertainties in Residual Gas Fraction Measurements in Automotive Engines: A Numerical Study

A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization

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