Heat Release Analysis of Oxygen-Enriched Diesel Combustion

Assanis, Dennis N.; Karvounis, Evangelos; Sekar, R.; Marr, W.W.

doi:10.1115/1.2906772

Cited by 8 publications

(2 citation statements)

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Section: Modeling Of the Heat Release And The Relevance Of The Ignitimentioning

confidence: 99%

“…Both the Watson et al correlation and the Miyamoto et al correlation allow reasonably good fitting of the heat release for a conventional diesel engine, but both models fail to address adequately the tail of combustion. 35 In the present work, an improved triple-Wiebe function is developed and used to characterize both dieselonly operation and dual-fuel operation. The approach is similar to that proposed by Watson 18estimates the heat release contribution from premixed combustion.…”

Section: Intake Temperature (K)mentioning

confidence: 99%

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A phenomenological combustion analysis of a dual-fuel natural-gas diesel engine

Anderson

Hoffman

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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Energy security concerns and an abundant supply of natural gas in the USA provide the impetus for engine designers to consider alternative gaseous fuels in the existing engines. The dual-fuel natural-gas diesel engine concept is attractive because of the minimal design changes, the ability to preserve a high compression ratio of the baseline diesel, and the lack of range anxiety. However, the increased complexity of a dual-fuel engine poses challenges, including the knock limit at a high load, the combustion instability at a low load, and the transient response of an engine with directly injected diesel fuel and port fuel injection of compressed natural gas upstream of the intake manifold. Predictive simulations of the complete engine system are an invaluable tool for investigations of these conditions and development of dual-fuel control strategies. This paper presents the development of a phenomenological combustion model of a heavy-duty dual-fuel engine, aided by insights from experimental data. Heat release analysis is carried out first, using the cylinder pressure data acquired with both diesel-only and dual-fuel (diesel and natural gas) combustion over a wide operating range. A diesel injection timing correlation based on the injector solenoid valve pulse widths is developed, enabling the diesel fuel start of injection to be detected without extra sensors on the fuel injection cam. The experimental heat release trends are obtained with a hybrid triple-Wiebe function for both diesel-only operation and dual-fuel operation. The ignition delay period of dual-fuel operation is examined and estimated with a predictive correlation using the concept of a pseudo-diesel equivalence ratio. A four-stage combustion mechanism is discussed, and it is shown that a triple-Wiebe function has the ability to represent all stages of dual-fuel combustion. This creates a critical building block for modeling a heavy-duty dual-fuel turbocharged engine system.

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Section: Modeling Of the Heat Release And The Relevance Of The Ignitimentioning

confidence: 99%

Section: Intake Temperature (K)mentioning

confidence: 99%

A phenomenological combustion analysis of a dual-fuel natural-gas diesel engine

Anderson

Hoffman

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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Cylinder balancing of direct injection engines

Nieuwstadt

Kolmanovsky

1999

Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251)

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Study of Using Oxygen-Enriched Combustion Air for Locomotive Diesel Engines

Assanis

Poola

Sekar

et al. 2000

Journal of Engineering for Gas Turbines and Power

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A thermodynamic simulation is used to study the effects of oxygen-enriched intake air on the performance and nitrogen oxide (NO) emissions of a locomotive diesel engine. The parasitic power of the air separation membrane required to supply the oxygen-enriched air is also estimated. For a given constraint on peak cylinder pressure, the gross and net power output of an engine operating under different levels of oxygen enrichment are compared with those obtained when a high-boost turbocharged engine is used. A 4% increase in peak cylinder pressure can result in an increase in net engine power of approximately 13% when intake air with an oxygen content of 28% by volume is used and fuel injection timing is retarded by 4 degrees. When the engine is turbocharged to a higher inlet boost, the same increase in peak cylinder pressure can result an improvement in power of only 4%. If part of the significantly higher exhaust enthalpies available as a result of oxygen enrichment are recovered, the power requirements of the air separator membrane can be met, resulting in substantial net power improvements. Oxygen enrichment with its attendant higher combustion temperatures, reduces emissions of particulates and visible smoke but increases NO emissions (by up to three times at 26% oxygen content). Therefore, exhaust gas after-treatment and heat recovery would be required if the full potential of oxygen enrichment for improving the performance of locomotive diesel engines is to be realized.

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Heat Release Analysis of Oxygen-Enriched Diesel Combustion

Cited by 8 publications

References 0 publications

A phenomenological combustion analysis of a dual-fuel natural-gas diesel engine

A phenomenological combustion analysis of a dual-fuel natural-gas diesel engine

Cylinder balancing of direct injection engines

Study of Using Oxygen-Enriched Combustion Air for Locomotive Diesel Engines

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