Effects of Variations in Market Gasoline Properties on HCCI Load Limits

Angelos, John P.; Andreae, Morgan; Green, William; Cheng, Wai K.; Kenney, Thomas E.; Yan, Xu

doi:10.4271/2007-01-1859

Cited by 10 publications

(8 citation statements)

References 19 publications

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“…Large variations in chemical composition have been reported, particularly for the volumetric content of aromatics and olefins. 1 Variations in chemical composition obviously affect chemical kinetics of real fuels. Hence, deep understanding of the interplay between fuel properties and HCCI combustion is a necessary prerequisite for developing robust control strategies and reliable HCCI engines.…”

Section: Overviewmentioning

confidence: 99%

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Effects of refinery stream gasoline property variation on the auto-ignition quality of a fuel and homogeneous charge compression ignition combustion

Lacey

Kameshwaran

Sathasivam

et al. 2016

International Journal of Engine Research

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The combination of in-cylinder thermal environment and fuel ignition properties plays a critical role in the homogeneous charge compression ignition engine combustion process. The properties of fuels available in the automotive market vary considerably and display different auto-ignition behaviors for the same intake charge conditions. Thus, in order for homogeneous charge compression ignition (HCCI) technology to become practically viable, it is necessary to characterize the impact of differences in fuel properties as a source of ignition/combustion variability. To quantify the differences, 15 gasolines composed of blends made from refinery streams were investigated in a single-cylinder homogeneous charge compression ignition engine. The properties of the refinery stream blends were varied according to research octane number, sensitivity (S = research octane number 2 motor octane number) and volumetric contents of aromatics and olefins. Nine fuels contained 10% ethanol by volume, and six more were blended with 20% ethanol. Pure ethanol (E100) and an un-oxygenated baseline fuel (RD3-87) were included too. For each fuel, a sweep of intake temperature at a consistent load and engine speed was conducted, and the combustion phasing given by the crank angle of 50% mass fraction burned was tracked to assess the sensitivity of auto-ignition to fuel chemical kinetics. The experimental results provided a wealth of information for predicting the HCCI combustion phasing from the given properties of a fuel. In this study, the original octane index correlation proposed by Kalghatgi based solely on fuel research octane number and motor octane number was found to be insufficient for characterizing homogeneous charge compression ignition combustion of refinery stream fuels. A new correlation was developed for estimation of auto-ignition properties of practical fuels in the typical HCCI engine. Fuel composition, captured by terms indicating the fraction of aromatics, olefins, saturates and ethanol, was added to generate the following formula: OI JKZ = RONÀ K 0 Á S + k Á (Aromatics 2 )(Olefins + Saturates) + eÁ (Aromatics Á Ethanol). The results indicate a significantly improved estimation of combustion phasing for gasoline fuels of varying chemical composition under low-temperature combustion conditions. Quantitative findings of this investigation and the new octane index correlation can be used for designing robust HCCI control strategies, capable of handling the wide spectrum of fuel chemical compositions found in pump gasoline.

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Section: Overviewmentioning

confidence: 99%

“…The extent of the aromatic and olefinic fraction variation in pump gasoline across the United States in 2007 can be found in Angelos et al 1 It is based on a study that analyzed thousands of gasoline samples throughout the United States. Aromatic content by volume ranged from 4% to 54% and olefinic fraction varied from 0% to 30%.…”

Section: Sensitivity Of Fuelsmentioning

confidence: 99%

Effects of refinery stream gasoline property variation on the auto-ignition quality of a fuel and homogeneous charge compression ignition combustion

Lacey

Kameshwaran

Sathasivam

et al. 2016

International Journal of Engine Research

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“…However, most of these studies have focused on [19] single-component fuels and fuel surrogates, which do not constitute a representative sample of the gasoline available at the pump. 2 and 3, which are based on a survey conducted by British Petroleum [19]. The extent of the compositional variation in pump gasoline available in the United States is displayed in Figs.…”

Section: Introductionmentioning

confidence: 99%

“…4 Histogram of RON variation for the U.S. market gasoiine; reprinted from Angeios et al [19] resulting variations were correlated with engine efficiency and conclusions were drawn pertaining to key mechanisms responsible for observed efficiency effects. The overall goal is to establish the effect of refinery stream fuel property variation on HCCI combustion.…”

Section: Introductionmentioning

confidence: 99%

Impact of Refinery Stream Gasoline Property Variation on Load Sensitivity of the HCCI Combustion

Lacey

Filipi

Sathasivam

et al. 2013

Journal of Engineering for Gas Turbines and Power

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The homogeneous charge compression ignition (HCCI) combustion process is highly reliant upon a favorable in-eylinder thermal environment in an engine, for a given fuel. Commercial fuels can differ considerably in composition and autoignition chemistry; hence, strategies intended to bring HCCI to market must account for this fuel variability. To this end, a test matrix consisting of eight gasoline fuels comprised of blends made solely from refineiy streams were run in an e.xperimental, single cylinder HCCI engine. All fuels contained 10% ethanol by volume and were representative of a cross section of fuels one would expect to find at gasoline pumps across the United States. The properties of the fuels were varied according to research octane number (RON), sensitivity (S = RON-MON), and volumetric content of aromatics and olefins. For each fuel, a sweep of load (mass of fuel injected per cycle) was conducted and the intake air temperature was adjusted in order to keep the crank angle of the 50% mass fraction burned point (CA50} constant. By analyzing the amount of temperature compensation required to maintain constant comhustion phasing, it was possihle to determine the sensitivity of HCCI to changes in load for various fuels. In addition, the deviation of fuel properties hrought ahout variations in important engine peiformance metrics like specific fuel consumption. Though the injected energy content per cycle was matched at the haseline point across the test fuel matrix, thermodynamic differences resulted in a spread of specific fuel consumption for the fuels tested.

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“…For additional information see Angelos et al (2007), Chesa Rocafort et al (2005), Yelvington et al (2003Yelvington et al ( , 2004 …”

Section: Report_02al67611_finaldoc -52 7/10/2007mentioning

confidence: 99%

A University Consortium on Homogeneous Charge Compression Ignition Engine Research

Assanis¹,

Bowman²,

Chen³

et al. 2007

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Effects of Variations in Market Gasoline Properties on HCCI Load Limits

Cited by 10 publications

References 19 publications

Effects of refinery stream gasoline property variation on the auto-ignition quality of a fuel and homogeneous charge compression ignition combustion

Effects of refinery stream gasoline property variation on the auto-ignition quality of a fuel and homogeneous charge compression ignition combustion

Impact of Refinery Stream Gasoline Property Variation on Load Sensitivity of the HCCI Combustion

A University Consortium on Homogeneous Charge Compression Ignition Engine Research

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