Transition from HCCI to PPC: the Sensitivity of Combustion Phasing to the Intake Temperature and the Injection Timing with and without EGR

Li, Changle; Yin, Lianhao; Shamun, Sam; Tunér, Martin; Johansson, Bengt; Solsjö, Rickard; Bai, Xue‐Song

doi:10.4271/2016-01-0767

Cited by 63 publications

(21 citation statements)

References 15 publications

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“…In addition, low combustion temperature can also cause incomplete conversion of fuel to CO 2 , thereby reducing efficiency and increasing CO and HC emissions. To solve these shortcomings, a large number of combustion control strategies have been proposed and examined both experimentally and numerically that can be organized into four main categories including variable compression ratio, 16,17 variable intake conditions, [18][19][20] regulated Exhaust Gas Recirculation (EGR), [21][22][23][24] and adjustable fuel blends. [25][26][27] As mentioned earlier, the application of oxy-fuel combustion with CCS technology has been mainly used on gas turbines and power plants and only a few studies have attempted to apply this strategy on IC engines.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

Mobasheri

Aïtouche

Peng

et al. 2021

International Journal of Engine Research

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The European Union (EU) has recently adopted new directives to reduce the level of pollutant emissions from non-road mobile machinery engines. The main scope of project RIVER for which this study is relating is to develop possible solutions to achieve nitrogen-free combustion and zero-carbon emissions in diesel engines. RIVER aims to apply oxy-fuel combustion with Carbon Capture and Storage (CCS) technology to eliminate NOx emissions and to capture and store carbon emissions. As part of this project, a computational fluid dynamic (CFD) analysis has been performed to investigate the effects of oxy-fuel combustion on combustion characteristics and engine operating conditions in a diesel engine under Homogenous Charge Compression Ignition (HCCI) mode. A reduced chemical n-heptane-n-butanol-PAH mechanism which consists of 76 species and 349 reactions has been applied for oxy-fuel HCCI combustion modeling. Different diluent strategies based on the volume fraction of oxygen and a diluent gas has been considered over a wide range of air-fuel equivalence ratios. Variation in the diluent ratio has been achieved by adding different percentages of carbon dioxide for a range from 77 to 83 vol.% in the intake charge. Results show that indicated thermal efficiency (ITE) has reduced from 32.7% to 20.9% as the CO2 concentration has increased from 77% to 83% at low engine loads while it doesn’t bring any remarkable change at high engine loads. It has also found that this technology has brought CO and PM emissions to a very ultra-low level (near zero) while NOx emissions have been completely eliminated.

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Section: Introductionmentioning

confidence: 99%

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

Mobasheri

Aïtouche

Peng

et al. 2021

International Journal of Engine Research

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“…Herein, the "walls" refers to the surfaces of the piston top, cylinder wall and piston top-land. Many studies considered the spray-wall interaction to be closely related to the high emissions of UHC and CO in PPC mode at low load [20,21]. Peterson et al [22] explored the fuel distribution in PPC mode at a low engine load of 3 bar gross indicated mean effective pressure (IMEP) using quantitative fuel-tracer planar laser-induced fluorescence (PLIF) imaging in an optical engine.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

et al. 2019

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We investigated the detailed spray-wall interaction in partially premixed combustion (PPC) in an optical engine with a wide-angle injector at low engine load. The fuel-trapping effect of the piston topland crevice was visualized by fuel-tracer planar laser-induced fluorescence (PLIF) for the first time. In agreement with the fuel distribution shown by PLIF, the combustion region first moves into the squish region and then tends to move back to the piston bowl when advancing the injection timings. Results indicate that a considerable portion of the fuel is trapped in the piston top-land crevice for the cases with injection timings at -30° (SOI-30 case) and -40° (SOI-40 case) CA aTDC. The SOI-40 case with earlier injection timing presents a backflow process of the trapped fuel from the piston top land crevice to the squish region. However, there is not enough time for the fuel vapor to flow back before the start of combustion for the SOI-30 case, resulting in a relatively lower fuel-air equivalence ratio in the squish region and thus higher CO emission than the SOI-40 case. This study provides insights into the fuel distribution characteristics in piston crevice and the potential effects on the engine emissions under PPC condition.

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“…Injection timing and strategy are the main factors to control the mixture stratification and consequently ignition timing and emissions in PPCI engine. Mixture stratification is highly dependent on the SOI due to different mixing time [7,8]. Li et al [7] showed that ignition timing of PPCI engine is highly sensitive to SOI whether EGR is used or not.…”

Section: Pfl-0690 Introductionmentioning

confidence: 99%

“…Mixture stratification is highly dependent on the SOI due to different mixing time [7,8]. Li et al [7] showed that ignition timing of PPCI engine is highly sensitive to SOI whether EGR is used or not. Multiple injection strategies can also improve the mixture preparation [9,10].…”

Section: Pfl-0690 Introductionmentioning

confidence: 99%

Numerical Investigation of PPCI Combustion at Low and High Charge Stratification Levels

Maghbouli¹,

Lucchini²,

D’Errico³

et al. 2017

SAE Technical Paper Series

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The authors need to carefully proofread their manuscript for grammatical errors. The articles "a" , "an" and "the" are either missing or unnecessarily inserted throughout the paper. A few examples include: Abstract, 1st sentence:insert "the" before 'low temperature combustion' (also, a note on capitalization-even though the abbreviation is capitalized, the full words are not) Abstract, 3rd sentence:insert "the" between 'lowers' and 'rate of heat release' Introduction, 1st sentence:delete 'been' and insert "a" after 'triggered' (see earlier note on capitalization as it also applies to 'internal combustion') Be sure to double check for spelling errors as well.(Caption for Fig. 8 on p. 7:"startification" should be spelled "stratification", and p. 9 last paragraph "fist" should be spelled "first" and "form" should be spelled "from") Some sentences are confusing and need to be clarified. A few examples include: P. 2 paragraph after Table 1: "Izadi et al. [8] found that ignition sensitivity for the experiments as in Fig. 1."This could be edited many ways, but it seems like the authors meant to insert a clause describing some notable result from [8] before the phrase "as in Fig. 1." P. 9 Second to last sentence in the "SOI-40" paragraph:"This is due to availability of larger amount of fuel in SOI-80 while second stage ignition." Thanks for the detailed observation of Reviewer 1. We have amended the manuscript text accordingly. Overall, this CFD paper helps to explain the experimental results observed in SAE Technical Paper 2016-01-0761. Note that I had to search for this paper number because the references section does not list the paper number for [8]. The authors need to be cautious about making broader, unproven claims that air-fuel mixture stratification can effectively control PPCI combustion phasing "under different engine operating conditions" (last sentence of abstract) when they only investigated a single, low-load operating condition. Abstract was changed. Please check. The authors acknowledge, in the last sentence of the second paragraph of the Introduction, that "There have note the correction from "has" to "have" been a number of experimental and numerical studies on the effect of mixture stratification on note the deletion of unnecessary article "the" PPCI combustion characteristics", so given that they are aware of other relevant papers it would be pertinent and informative to briefly review/compare/contrast (cite!) these works in the Introduction and discussion of their own results. There was a misunderstanding in the first draft. After this sentence both experimental and numerical literature review were provided. Please check.

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Transition from HCCI to PPC: the Sensitivity of Combustion Phasing to the Intake Temperature and the Injection Timing with and without EGR

Cited by 63 publications

References 15 publications

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

Experimental Study on the Effects of Spray–Wall Interaction on Partially Premixed Combustion and Engine Emissions

Numerical Investigation of PPCI Combustion at Low and High Charge Stratification Levels

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