Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Vourliotakis, George; Kolaitis, Dionysios I.; Founti, M.

doi:10.1155/2014/237049

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…The maximum c ¯ at the earliest depicted CA (15° CA before top dead centre (bTDC)) is 0.2%; even lower c ¯ are observed at earlier CAs (at mean temperatures still greater than 1000 K) and are not shown here. There is no observable low-temperature heat release (LTHR), 41 which would have been evident as finite reaction progress at temperatures between approximately 650 and 800 K. The temperature of the hottest 1% of the charge ( T 1 % ) and mean temperature ( T m ) from the corresponding non-reacting CFD simulations at the same CA are plotted in the figure. T 1 % coincides with the portion of the charge having the greatest reaction progress during the inspected CAs leading up to ignition ( θ IGN = −12.5° CA).…”

Section: Evaluation Of the Hcci Ignition Processmentioning

confidence: 99%

A thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part I — Adiabatic core ignition model

Shingne

Middleton

Assanis

et al. 2016

International Journal of Engine Research

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This two-part article presents a model for boosted and moderately stratified homogeneous charge compression ignition combustion for use in thermodynamic engine cycle simulations. The model consists of two components: one an ignition model for the prediction of auto-ignition onset and the other an empirical combustion rate model. This article focuses on the development and validation of the homogeneous charge compression ignition model for use under a broad range of operating conditions. Using computational fluid dynamics simulations of the negative valve overlap valve events typical of homogeneous charge compression ignition operation, it is shown that there is no noticeable reaction progress from low-temperature heat release, and that ignition is within the high-temperature regime (T . 1000 K), starting within the highest temperature cells of the computational fluid dynamics domain. Additional parametric sweeps from the computational fluid dynamics simulations, including sweeps of speed, load, intake manifold pressures and temperature, dilution level and valve and direct injection timings, showed that the assumption of a homogeneous charge (equivalence ratio and residuals) is appropriate for ignition modelling under the conditions studied, considering the strong sensitivity of ignition timing to temperature and its weak compositional dependence. Use of the adiabatic core temperature predicted from the adiabatic core model resulted in temperatures within 61% of the peak temperatures of the computational fluid dynamics domain near the time of ignition. Thus, the adiabatic core temperature can be used within an auto-ignition integral as a simple and effective method for estimating the onset of homogeneous charge compression ignition autoignition. The ignition model is then validated with an experimental 92.6 anti-knock index gasoline-fuelled homogeneous charge compression ignition dataset consisting of 290 data points covering a wide range of operating conditions. The tuned ignition model predictions of u 50 have a root mean square error of 1.7°crank angle and R 2 = 0.63 compared to the experiments.

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Section: Evaluation Of the Hcci Ignition Processmentioning

confidence: 99%

A thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part I — Adiabatic core ignition model

Shingne

Middleton

Assanis

et al. 2016

International Journal of Engine Research

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“…Experimental studies are more and more accompanied by numerical studies to better understand the physical phenomena involved in the combustion process in diesel engines when fuelled by biodiesel [3][4][5]. Numerical studies in diesel combustion are often performed using surrogates for which combustion kinetic mechanisms are well established and are comparable to those of investigated fuels [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling

Abbe

Raïdandi

Nzengwa

2016

Journal of Combustion

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To meet more stringent norms and standards concerning engine performances and emissions, engine manufacturers need to develop new technologies enhancing the nonpolluting properties of the fuels. In that sense, the testing and development of alternative fuels such as biodiesel are of great importance. Fuel testing is nowadays a matter of experimental and numerical work. Researches on diesel engine’s fuel involve the use of surrogates, for which the combustion mechanisms are well known and relatively similar to the investigated fuel. Biodiesel, due to its complex molecular configuration, is still the subject of numerous investigations in that area. This study presents the comparison of four biodiesel surrogates, methyl-butanoate, ethyl-butyrate, methyl-decanoate, and methyl-9-decenoate, in a 0D phenomenological combustion model. They were investigated for in-cylinder pressure, thermal efficiency, andNOxemissions. Experiments were performed on a six-cylinder turbocharged DI diesel engine fuelled by methyl ester (MEB) and ethyl ester (EEB) biodiesel from wasted frying oil. Results showed that, among the four surrogates, methyl butanoate presented better results for all the studied parameters. In-cylinder pressure and thermal efficiency were predicted with good accuracy by the four surrogates.NOxemissions were well predicted for methyl butanoate but for the other three gave approximation errors over 50%.

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“…C 7 H 14 OOH decomposition reactions and the OH radical consuming reactions (by HCHO, HO 2 , etc.) cause slight reduction in temperature 46. Comparatively, slightly more species (in LTHR) concentration has been observed for the DDC2 case than that for the CDFC case.…”

mentioning

confidence: 99%

Numerical Analysis of the Effects of Direct Dual Fuel Injection on the Compression Ignition Engine

Muniappan

Sreedhara

Duvvuri³

2020

ACS Omega

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In this work, the influence of direct dual fuel injection on a compression ignition engine fueled with gasoline and diesel has been investigated. To do this, closed cycle combustion simulations have been performed. Gasoline has been supplied through port injection and early direct and late direct injection to achieve fuel stratification and emission reduction. Simulations have been done for various start of injection (SOI) timings of diesel fuel. A detailed discussion on a low temperature heat release (LTHR) mechanism has been done. Results revealed that the maximum gross indicated thermal efficiency (GITE) of 39% is obtained for port injection of gasoline mode. Direct dual fuel combustion (type 2) (DDC2) mode shows approximately 2% and 38% less GITE and oxides of nitrogen (NOx), respectively, and 40% more soot as compared to the port injection gasoline mode. DDC2 mode shows lower oxides of carbon and hydrocarbon emissions as compared to other dual fuel modes. More than 99% of combustion efficiency and less maximum pressure rise rate have been noticed in the DDC2 case. Strong LTHR and high temperature premixed combustion region have been found in advanced SOI timing cases (in DDC2). In-cylinder contours for the DDC2 case show that diesel and gasoline fuels combusted successively cause less in-cylinder temperature than that for the conventional dual fuel combustion case.

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Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Cited by 3 publications

References 49 publications

A thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part I — Adiabatic core ignition model

A thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part I — Adiabatic core ignition model

Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling

Numerical Analysis of the Effects of Direct Dual Fuel Injection on the Compression Ignition Engine

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