Probing Species Formed by Pilot Injection During Re-Compression in a Controlled Auto-Ignition Engine by H<sub>2</sub>CO LIF and Chemiluminescence Imaging

Huelser, Thomas; Schulz, Christof; Brands, Thorsten; Grünefeld, Gerd; Koß, Hans-Jürgen; Morcinkowski, Bastian; Pischinger, Stefan; Adomeit, Philipp

doi:10.4271/2014-01-1275

Cited by 7 publications

(3 citation statements)

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“…From among the species analysed in this study, acetylene, ethylene and formaldehyde are commonly recognised as auto-ignition promoters. 35,36 However, a recent work by Huelser et al 39 did not confirm the effect of formaldehyde. In order to predict species effect on the main combustion event, it is convenient to use a mole fraction metric at IVC event.…”

Section: Resultsmentioning

confidence: 95%

“…This was conducted by in-cylinder gas sampling [34][35][36][37][38] or quantification of species concentrations via laser-induced fluorescence. 39 Hunicz 40 proposed a non-intrusive and technically simple method based on the sampling of the backflows gas after NVO. The state-of-the-art achievements of experimental investigations into chemical effects of NVO fuel injection are summarised below.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Resultsmentioning

confidence: 95%

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

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“…This indicates that fuel reforming indeed produced products promoting combustion. Some studies also experimentally quantified species production during the NVO period [34,35]. Studies by Yu et al [36] and Puranam and Steeper [37] provide information about the influence of certain species towards autoignition.…”

Section: Introduction Reactivity Controlled Compression Ignition (Rcci)mentioning

confidence: 99%

Natural gas-diesel reactivity controlled compression ignition with negative valve overlap and in-cylinder fuel reforming

2019

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Investigation of the thermal effects of fuel injection into retained residuals in HCCI engine

Hunicz

Mikulski²

2018

Applied Energy

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Probing Species Formed by Pilot Injection During Re-Compression in a Controlled Auto-Ignition Engine by H₂CO LIF and Chemiluminescence Imaging

Cited by 7 publications

References 42 publications

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

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

Natural gas-diesel reactivity controlled compression ignition with negative valve overlap and in-cylinder fuel reforming

Investigation of the thermal effects of fuel injection into retained residuals in HCCI engine

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Probing Species Formed by Pilot Injection During Re-Compression in a Controlled Auto-Ignition Engine by H2CO LIF and Chemiluminescence Imaging

Cited by 7 publications

References 42 publications

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

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

Natural gas-diesel reactivity controlled compression ignition with negative valve overlap and in-cylinder fuel reforming

Investigation of the thermal effects of fuel injection into retained residuals in HCCI engine

Contact Info

Product

Resources

About

Probing Species Formed by Pilot Injection During Re-Compression in a Controlled Auto-Ignition Engine by H₂CO LIF and Chemiluminescence Imaging