Sensitivity Analysis Study on Ethanol Partially Premixed Combustion

Kaiadi, Mehrzad; Johansson, Bengt; Lundgren, Marcus; Gaynor, John A.

doi:10.4271/2013-01-0269

Cited by 28 publications

(18 citation statements)

References 10 publications

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“…Further research in heavy-duty and light-duty 4-stroke diesel engines operating with PPC concept using gasoline-like fuels and ethanol performed respectively by Wisconsin-Madison University, 16 Lund University [17][18][19][20][21][22] and more recently by Delphi Corporation, [23][24][25] confirmed the possibility to implement the PPC concept with very high efficiency, very low NO X emissions and low soot levels in a wide load operating range. However, the octane number is closely linked to the load range since the fuel ignition properties should be optimized to the given operating condition.…”

Section: Introductionmentioning

confidence: 95%

Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine

Benajes

Lima

Tribotté

2014

International Journal of Engine Research

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SAGE PublicationsBenajes Calvo, JV.; Novella Rosa, R.; De Lima Moradell, DA.; Tribotté, P. (2015). Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine. AbstractTwo main research paths are being followed to develop compression ignition (CI) engines, the extreme optimization of the conventional diesel combustion (CDC) concept and the development of alternative combustion concepts. The optimization of the CDC concept focuses on exploring the potential of the flexibility provided by the new engine subsystems to control the combustion development in an attempt to improve pollutant emissions and efficiency levels. In the frame of the development of alternative combustion concepts, the Partially Premixed Combustion (PPC) using high volatility and low reactivity fuels, such as gasoline-like fuels with different octane numbers, has been extensively evaluated in 4-stroke engines, confirming its benefits in terms of emissions and efficiency at medium to high loads, but also its critical problems at low loads including difficulties to assure stable ignition and engine efficiency deterioration. The already confirmed high flexibility of the innovative 2-stroke poppet valves high speed direct injection (HSDI) CI engine under development in terms of air management settings to control the cylinder conditions and affect final combustion environment encouraged the authors to perform a detailed optimization of the CDC concept in an attempt to find the real limits of this engine configuration. Additionally, its compatibility with the PPC concept using a high octane fuel (Research Octane Number 95) with a triple injection strategy for reducing pollutant emissions at medium-to-low load conditions has been evaluated considering also the impact on engine efficiency.Results at low speed and medium load confirm how the engine configuration provides potential for attaining stateof-the-art emission levels operating with the CDC concept, and how emissions and efficiency can be optimized by adjusting the air management settings without facing any additional trade-off aside from that usual between NO X and soot. The feasibility of combining this engine configuration with the PPC concept using gasoline as fuel for controlling pollutant emissions has been also corroborated and, with a fine tuned triple injection strategy, engine efficiency even improves compared to that obtained operating with a well optimized CDC concept.

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Section: Introductionmentioning

confidence: 95%

Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine

Benajes

Lima

Tribotté

2014

International Journal of Engine Research

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“…Since this early work, many research groups from Lund University [27][28][29][30][31][32], University of Cambridge [33], Argonne National Laboratory [34][35][36], University of Wisconsin Madison [37] and Delphi Corporation [38][39][40] have performed additional experimental and numerical investigations operating with PPC using different fuels in the octane range of gasoline and ethanol. Different injection strategies have been explored, with various EGR rates, boost pressures, intake temperatures and swirl ratios at different engine loads and speeds.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Multiple Injection Strategies for Gasoline PPC Operation in a Newly Designed 2-Stroke HSDI Compression Ignition Engine

Benajes

Lima

Tribotté

2015

SAE Int. J. Engines

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Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven its potential to achieve simultaneous reduction in soot and NOX emissions, combined with high indicated efficiencies; while still retaining proper control over combustion phasing with the injection event, contrary to fully premixed strategies. However, gasoline fuels with high octane number as the commonly available for the public provide a challenge to ensure reliable ignition especially in the low load range, while fuel blends with lower octane numbers present problems for extending the ignition delay in the high load range and avoid the onset of knocking-like combustion. Thus, choosing an appropriate fuel and injection strategy is critical to solve these issues, assuring successful PPC operation in the full engine map.In this framework, the objective of the present investigation consists of evaluating the use of multiple injection strategies for achieving stable PPC operation, attaining low NOX and soot emissions together with high efficiencies. This research was carried out in a singlecylinder DOHC 2-stroke HSDI CI engine using 95 Research Octane Number (RON) gasoline fuel. Three different operating conditions in terms of indicated mean effective pressure (IMEP) and speed were investigated: 3.1 bar IMEP and 1250 rpm, 5.5 bar IMEP and 1500 rpm and 10.4 bar IMEP and 1500 rpm. Parametric variations of injection timings, at different rail pressures and different fuel split between injections were experimentally performed to analyze the effect of the injection strategy over the combustion process, exhaust emissions and efficiency levels.Experimental results confirm how using an appropriate injection strategy helps to achieve stable PPC operation in the selected operating conditions; with competitive combustion stability, lower NOX and soot levels, and moderate CO and HC emissions with combustion efficiency over 96%, compared to Conventional Diesel Combustion (CDC).Finally, a detailed analysis of the local cylinder conditions was performed by means of 3D-CFD simulations in order to provide guidelines for further optimization of the gasoline PPC concept, when using multiple injection strategies in the 2-stroke engine under development.

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“…While PPC is affected mainly by the injection, however the intake condition still has impact on the combustion. High temperature advances combustion phasing and low temperature causes too late combustion resulting in misfire (Kaiadi et al, 2013). Temperature estimation and control can be used to stabilise the combustion phasing in PPC mode.…”

Section: Introductionmentioning

confidence: 99%

“…PPC takes advantage of high exhaust gas recirculation (EGR) to extend the ignition delay time so that the start of combustion is retarded after the end of injection. The long ignition delay time results into longer mixing time of air and fuel, which reduces the soot formation and also influences the combustion timing (Kaiadi et al, 2013). Therefore the ignition delay is an important control parameter for PPC.…”

Section: Introductionmentioning

confidence: 99%

Partially premixed combustion multi-cylinder engine cycle-to-cycle-oriented temperature estimation and control

Yin

Ingesson

Tunestål

et al. 2017

IJPT

Self Cite

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Advanced combustion concepts like partially premixed combustion (PPC) are sensitive to inlet gas conditions especially inlet temperature. To estimate the combustion parameters like ignition delay on a cycle-to-cycle basis, both complementary filter and extended Kalman filter were designed to estimate the inlet temperature, and the ignition delay was calculated with properly estimated temperature. A two valve fast thermal management system was used to control the inlet temperature, and a PI controller with the lambda tuning method was used. The estimation and control algorithm were verified on a six-cylinder heavy duty engine.

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Sensitivity Analysis Study on Ethanol Partially Premixed Combustion

Cited by 28 publications

References 10 publications

Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine

Analysis of combustion concepts in a newly designed two-stroke high-speed direct injection compression ignition engine

Investigation on Multiple Injection Strategies for Gasoline PPC Operation in a Newly Designed 2-Stroke HSDI Compression Ignition Engine

Partially premixed combustion multi-cylinder engine cycle-to-cycle-oriented temperature estimation and control

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