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Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode (2022)
Journal Article
Shafiq, O., & Tingas, E. (2023). Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode. International Journal of Engine Research, 24(5), 2279-2294. https://doi.org/10.1177/14680874221117686

The potential use of hydrogen peroxide as an ignition promoter to enable the use of ammonia in compression ignition engines is explored in the current study. A simplified numerical HCCI engine model within the Chemkin Pro suite is employed. The numer... Read More about Computational investigation of ammonia-hydrogen peroxide blends in HCCI engine mode.

Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends (2022)
Journal Article
Fernie, O., Megaritis, T., Ganippa, L. C., & Tingas, E. (2022). Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends. Fuel, 326, Article 125100. https://doi.org/10.1016/j.fuel.2022.125100

The addition of hydrogen peroxide and steam to a hydrogen-fuelled HCCI engine was investigated at various fuel lean conditions ( = 0.2–0.6) and compression ratios (15–20) using a 0-dimensional numerical model. The use of hydrogen peroxide as an ignit... Read More about Numerical analysis of zero-carbon HCCI engine fuelled with steam diluted H2/H2O2 blends.

Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends (2022)
Journal Article
Dimitrova, I. D., Megaritis, T., Ganippa, L. C., & Tingas, E. (2022). Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends. International Journal of Hydrogen Energy, 47(17), 10083-10096. https://doi.org/10.1016/j.ijhyden

In the current work, Chemkin Pro's HCCI numerical model is used in order to explore the feasibility of using hydrogen in a dual fuel concept where hydrogen peroxide acts as ignition promoter. The analysis focuses on the engine performance characteris... Read More about Computational analysis of an HCCI engine fuelled with hydrogen/hydrogen peroxide blends.

Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames (2021)
Journal Article
Song, W., Hernández Pérez, F. E., Tingas, E., & Im, H. G. (2021). Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames. Combustion and Flame, 232, Article 111523. https://doi.org/10.1016/j.combustflame.202

A statistical analysis is conducted for turbulent hydrogen-air premixed flames at a range of Karlovitz numbers up to 1,126 by direct numerical simulations (DNS) with detailed chemistry. The local and global burning velocities are evaluated and the de... Read More about Statistics of local and global flame speed and structure for highly turbulent H2/air premixed flames.

Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport (2021)
Journal Article
King, R., & Tingas, E. (2021). Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport. Journal of Energy Engineering, 147(4), 04021025. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000775

As a result of anthropocentric climate change, there is an urgent need to decarbonize the supply of energy. Organic biomass, referred to as feedstock, can be converted into biofuels that have the potential to decarbonize transport. However, biofuels... Read More about Potential for Carbon-Neutral Advanced Biofuels in UK Road Transport.

Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames (2021)
Journal Article
Tingas, E. (2021). Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames. Fuel, 302, Article 121081. https://doi.org/10.1016/j.fuel.2021.121081

In the current work, the effect of H2O2 addition on the flame structure, laminar flame speed and NOx emissions is investigated in the context of 1D laminar premixed H2/air flames at Tu = 300 and 600 K, p = 1 and 30 atm, = 0.5. Mathematical tools fro... Read More about Computational analysis of the effect of hydrogen peroxide addition on premixed laminar hydrogen/air flames.

The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions (2021)
Journal Article
Tingas, E. (2021). The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions. Fuel, 296, Article 120594. https://doi.org/10.1016/j.fuel.2021.120594

In the current work, the use of hydrogen peroxide as an additive to hydrogen/air mixtures is proposed and explored computationally, in conditions relevant to compression ignition engines. The hydrogen/hydrogen peroxide blends are supplemented with st... Read More about The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions.

Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications (2020)
Journal Article
Sharmin, N., & Tingas, E. (2020). Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications. Journal of Energy Engineering, 146(6), Article 04020064. https://doi.org/10.1061/%28asce%29ey

The autoignition dynamics of a three-component surrogate jet fuel (66.2% n-dodecane, 15.8% n-proplylbenzene, 18.0% 1,3,5-trimethylcyclohexane) suitable for usage as Jet A-1 and RP-3 aviation fuels are analyzed, using the detailed mechanism of Liu et... Read More about Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications.

Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales (2020)
Journal Article
Yalamanchi, K. K., Tingas, E., Im, H. G., & Sarathy, S. M. (2020). Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales. International Journal of Chemical Kinetics, 52(9), 599-610. https://doi.org/10.1002/kin.

Detailed gas‐phase chemical kinetic models are widely used in combustion research, and many new mechanisms for different fuels and reacting conditions are developed each year. Recent works have highlighted the need for error checking when preparing s... Read More about Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales.

Computational singular perturbation analysis of brain lactate metabolism (2019)
Journal Article
Patsatzis, D. G., Tingas, E., Goussis, D. A., & Sarathy, S. M. (2019). Computational singular perturbation analysis of brain lactate metabolism. PLOS ONE, 14(12), Article e0226094. https://doi.org/10.1371/journal.pone.0226094

Lactate in the brain is considered an important fuel and signalling molecule for neuronal activity, especially during neuronal activation. Whether lactate is shuttled from astrocytes to neurons or from neurons to astrocytes leads to the contradictory... Read More about Computational singular perturbation analysis of brain lactate metabolism.

Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures (2019)
Journal Article
Khalil, A. T., Manias, D. M., Tingas, E., Kyritsis, D. C., & Goussis, D. A. (2019). Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures. Energies, 12(23), Article 4422. https://doi.org/10.3390/en12234422

The dynamics of a homogeneous adiabatic autoignition of an ammonia/air mixture at constant volume was studied, using the algorithmic tools of Computational Singular Perturbation. Since ammonia combustion is characterized by both unrealistically long... Read More about Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures.

Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels (2019)
Journal Article
Singh, E., Tingas, E., Goussis, D., Im, H. G., & Sarathy, S. M. (2019). Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels. Energy and Fuels, 33(10), 10185-10196. https://doi.org/10.1021/acs.energyfuels.9b01423

Synergistic octane blending behavior of ethanol with gasoline and its surrogates has been observed by many researchers. The nonlinear octane boosting tendency is observed at mid and high molar blends of ethanol in primary reference fuels. The present... Read More about Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels.

Topological and chemical characteristics of turbulent flames at MILD conditions (2019)
Journal Article
Manias, D. M., Tingas, E., Minamoto, Y., & Im, H. G. (2019). Topological and chemical characteristics of turbulent flames at MILD conditions. Combustion and Flame, 208, 86-98. https://doi.org/10.1016/j.combustflame.2019.06.031

Dominant physical processes that characterize the combustion of a lean methane/air mixture, diluted with exhaust gas recirculation (EGR), under turbulent MILD premixed conditions are identified using the combined approach of Computational Singular Pe... Read More about Topological and chemical characteristics of turbulent flames at MILD conditions.

Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model (2019)
Journal Article
Li, Y., Alfazazi, A., Mohan, B., Alexandros Tingas, E., Badra, J., Im, H. G., & Mani Sarathy, S. (2019). Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model. Fuel, 247, 164-178. https://doi.org/10.1016/j

The prospect of blending gasoline fuel with ethanol is being investigated as a potential way to improve the knock residence of the base gasoline. However, one of the drawbacks is a lack of proper understanding of the reason for the non-linear respons... Read More about Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model.

H2/Air Autoignition Dynamics around the Third Explosion Limit (2018)
Journal Article
Tingas, E., Kyritsis, D. C., & Goussis, D. A. (2019). H2/Air Autoignition Dynamics around the Third Explosion Limit. Journal of Energy Engineering, 145(1), Article 04018074. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000588

This paper examines the influence of wall reactions on the generation of the explosive time scale that characterizes ignition delay around the third explosion limit of a stoichiometric H2/air homogeneous mixture. The only wall reactions exhibiting a... Read More about H2/Air Autoignition Dynamics around the Third Explosion Limit.

Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index (2018)
Journal Article
Manias, D. M., Tingas, E., Hernández Pérez, F. E., Malpica Galassi, R., Paolo Ciottoli, P., Valorani, M., & Im, H. G. (2019). Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate

Turbulent premixed flames at high Karlovitz numbers exhibit highly complex structures in different reactive scalar fields to the extent that the definition of the flame front in an unambiguous manner is not straightforward. This poses a significant c... Read More about Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index.

Three-stage heat release in n-heptane auto-ignition (2018)
Journal Article
Sarathy, S. M., Tingas, E., Nasir, E. F., Detogni, A., Wang, Z., Farooq, A., & Im, H. (2019). Three-stage heat release in n-heptane auto-ignition. Proceedings of the Combustion Institute, 37(1), 485-492. https://doi.org/10.1016/j.proci.2018.07.075

Multi-stage heat release is an important feature of hydrocarbon auto-ignition that influences engine operation. This work presents findings of previously unreported three-stage heat release in the auto-ignition of n-heptane/air mixtures at lean equiv... Read More about Three-stage heat release in n-heptane auto-ignition.

Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames (2018)
Journal Article
Tingas, E., Diamantis, D. J., & Goussis, D. A. (2018). Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames. Combustion Theory and Modelling, 22(6), 1049-1083. https://doi.org/10.1080/13647830

A model reduction methodology, based on the quasi steady-state approximation (QSSA), is employed for the construction of reduced mechanisms in the case of an n-heptane/air premixed flame. Several issues related to the construction of these reduced me... Read More about Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames.

A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer (2018)
Journal Article
Song, W., Tingas, E., & Im, H. G. (2018). A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer. Combustion and Flame, 195, 84-98. https://doi.org/10.1016/j.combustflame.2018.03.037

To provide fundamental insights into the ignition enhancement of methanol (MeOH) by the addition of the more reactive dimethyl ether (DME), computational parametric studies were conducted in a one-dimensional counterflow fuel versus air mixing layer... Read More about A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer.