The Effect of Acetylene on Iso-octane Combustion in an HCCI Engine with NVO

Puranam, Srivatsava; Steeper, Richard R.

doi:10.4271/2012-01-1574

Cited by 25 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 and 8b. It should be noted that acetylene is one of the most effective products in terms of auto-ignition properties improvement, which is produced by exhaust-fuel reactions during the NVO period [12,13]. The plausible explanation of the reduction in production of species at higher engine loads could be the thermal effect of fuel vaporisation during NVO.…”

Section: Detailed Speciation Of Hydrocarbons In Cylinder-out Exhaustmentioning

confidence: 95%

“…The introduction of fuel in the early stage of the NVO period (during exhaust compression) enables fuel pyrolysis, which results in the production of autoignition promoting species, like ethane, ethylene, acetylene, formaldehyde, and methanol [9e12]. The appearance of these species in the combustible mixture advances the start of combustion by a couple of degrees when compared to mixture formation outside of the cylinder under the same thermal conditions [13,14]. It enables the extension of the engine operating range.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter

Hunicz

Medina

2016

Energy

View full text Add to dashboard Cite

Section: Detailed Speciation Of Hydrocarbons In Cylinder-out Exhaustmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter

Hunicz

Medina

2016

Energy

View full text Add to dashboard Cite

“…Acetaldehyde, propene and methane were neutral, while 1,3-butadiene exhibited auto-ignition retarding properties. In order to isolate a chemical effect of the combustible mixture, Puranam and Steeper 42 performed a controlled experiment where acetylene was added to main fuel (isooctane). These investigations confirmed that C 2 H 2 concentration of approximately 700 ppm in a fresh mixture advanced auto-ignition by several crank angle degrees (CADs) under the same thermal conditions.…”

Section: Introductionmentioning

confidence: 99%

An experimental study into the chemical effects of direct gasoline injection into retained residuals in a homogeneous charge compression ignition engine

Hunicz

2016

International Journal of Engine Research

View full text Add to dashboard Cite

Fuel injection into retained residuals and the resulting exhaust-fuel reactions appear to be an effective method for enhancing mixture reactivity in residual effected homogeneous charge compression ignition engines. Varying the extent of reactions preceding the main combustion event enables the control of auto-ignition timing and heat release. Although fuel injection during the negative valve overlap period is widely utilised, there is still insufficient amount of data on its chemical effects. This study experimentally explores the species formation as a result of negative valve overlap exhaustfuel reactions. To collect experimental data, a single-cylinder engine with negative valve overlap and direct gasoline injection was utilised. Valving strategy of the engine was strategically set to achieve a high rate of backflows at the end of the intake process. Negative valve overlap gas, diluted by intake air, was sampled from the intake runner and passed to a Fourier transform infrared analytical system. A dedicated procedure was applied to compute degrees of fuel conversion into species from the diluted samples. The experiments were designed to acquire comprehensive data on the effects of different fuel injection timings on species formation during negative valve overlap. The results showed that exhaust-fuel reactions could produce high quantities of methane and light unsaturated hydrocarbons. At early negative valve overlap fuel injection, up to 25% of fuel was converted into species, whereas chemical changes were negligible for late fuel injection. Additionally, the effects of excess air and amounts of fuel injected during negative valve overlap were investigated.

show abstract

“…Direct fuel injection in the early stage of the NVO period (during exhaust compression) enables fuel reforming, which results in the production of auto-ignition promoting species, like ethane, ethylene, acetylene, formaldehyde and methanol [3,5,6]. As a result, early NVO injection advances the start of combustion by a couple of degrees when compared to mixture preparation outside of the cylinder under the same thermal conditions [7,8]. However, the majority of researchers recognize thermal NVO processes as dominant in combustion development [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Fuel Injection Strategies on Cycle-by-Cycle Variability in a Gasoline Homogeneous Charge Compression Ignition Engine: Sample Entropy Analysis

Hunicz

Medina

Litak

et al. 2015

Entropy

View full text Add to dashboard Cite

Abstract:In this study we summarize and analyze experimental observations of cyclic variability in homogeneous charge compression ignition (HCCI) combustion in a single-cylinder gasoline engine. The engine was configured with negative valve overlap (NVO) to trap residual gases from prior cycles and thus enable auto-ignition in successive cycles. Correlations were developed between different fuel injection strategies and cycle average combustion and work output profiles. Hypothesized physical mechanisms based on these correlations were then compared with trends in cycle-by-cycle predictability as revealed by sample entropy. The results of these comparisons help to clarify how fuel injection strategy can interact with prior cycle effects to affect combustion stability and so contribute to design control methods for HCCI engines.

show abstract

The Effect of Acetylene on Iso-octane Combustion in an HCCI Engine with NVO

Cited by 25 publications

References 26 publications

Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter

Experimental study on detailed emissions speciation of an HCCI engine equipped with a three-way catalytic converter

An experimental study into the chemical effects of direct gasoline injection into retained residuals in a homogeneous charge compression ignition engine

Effects of Direct Fuel Injection Strategies on Cycle-by-Cycle Variability in a Gasoline Homogeneous Charge Compression Ignition Engine: Sample Entropy Analysis

Contact Info

Product

Resources

About