Explanipedia

Engine experiments using a CFD-improved dimple stepped-lip piston in a diesel engine. Open

Angela Wu, Seokwon Cho, Darío López Pintor, Stephen Busch, Federico Perini , et al. · 2023

The future of ship engines: Renewable fuels and enabling technologies for decarbonization Open

Scott Curran, Angelo Onorati, Raúl Payri, Avinash Kumar Ágarwal, C. Arcoumanis , et al. · 2023

Shipping is one of the most efficient transportation modes for moving freight globally. International regulations concerning decarbonization and emission reduction goals drive rapid innovations to meet the 2030 and 2050 greenhouse gas redu…

Engine combustion control via fuel reactivity stratification Open

Rolf D. Reitz, Reed Hanson, Derek Splitter, Sage Kokjohn · 2023

A compression ignition engine uses two or more fuel charges having two or more reactivities to control the timing and duration of combustion. In a preferred implementation, a lower-reactivity fuel charge is injected or otherwise introduced…

Internal combustion engine using premixed combustion of stratified charges Open

Craig D Marriott, Rolf D. Reitz · 2023

During a combustion cycle, a first stoichiometrically lean fuel charge is injected well prior to top dead center, preferably during the intake stroke. This first fuel charge is substantially mixed with the combustion chamber air during sub…

Engine Valve Actuation For Combustion Enhancement Open

Rolf D. Reitz, Christopher J. Rutland, Rahul Jhavar · 2023

A combustion chamber valve, such as an intake valve or an exhaust valve, is briefly opened during the compression and/or power strokes of a 4-stroke combustion cycle in an internal combustion engine (in particular, a diesel or CI engine). …

Engine combustion control at low loads via fuel reactivity stratification Open

Rolf D. Reitz, Reed Hanson, Derek Splitter, Sage Kokjohn · 2023

A compression ignition (diesel) engine uses two or more fuel charges during a combustion cycle, with the fuel charges having two or more reactivities (e.g., different cetane numbers), in order to control the timing and duration of combusti…

Diesel engine emissions reduction by multiple injections having increasing pressure Open

Rolf D. Reitz, Matthew P Thiel · 2023

Multiple fuel charges are injected into a diesel engine combustion chamber during a combustion cycle, and each charge after the first has successively greater injection pressure (a higher injection rate) than the prior charge. This injecti…

Low-speed pre-ignition and super-knock in boosted spark-ignition engines: A review Open

Kristian Rönn, André Swarts, Vickey Kalaskar, Terry D. Alger, Rupali Tripathi , et al. · 2022

Effects of a CFD-improved dimple stepped-lip piston on thermal efficiency and emissions in a medium-duty diesel engine Open

Angela Wu, Seokwon Cho, Darío López Pintor, Stephen Busch, Federico Perini , et al. · 2022

Diesel piston-bowl shape is a key design parameter that affects spray-wall interactions and turbulent flow development, and in turn affects the engine’s thermal efficiency and emissions. It is hypothesized that thermal efficiency can be im…

Numerical and Experimental Studies of a Novel Dimpled Stepped-Lip Piston Design on Turbulent Flow Development in a Medium-Duty Diesel Engine Open

Angela Wu, Stephen Busch, Federico Perini, Seokwon Cho, Darío López Pintor , et al. · 2022

Spray-wall interactions in diesel engines have a strong influence on turbulent flow evolution and mixing, which influences the engine’s thermal efficiency and pollutant-emissions behavior. Previous optical experiments and numerical investi…

Non-Equilibrium Law-of-the-Wall Modeling for Improved Heat Transfer Predictions: Model Development and Validation Open

Federico Perini, Angela Wu, Stephen Busch, Rolf D. Reitz · 2022

A one-dimensional, non-equilibrium, compressible law of the wall model is proposed to increase the accuracy of heat transfer predictions from computational fluid dynamics (CFD) simulations of internal combustion engine flows on engineering…

Advanced Finite-Volume Numerics and Source Term Assumptions for Kernel and G-Equation Modelling of Propane/Air Flames Open

Flavio Dal Forno Chuahy, Federico Perini, Derek Splitter, Arpan Sircar, Rolf D. Reitz · 2022

G-Equation models represent propagating flame fronts with an implicit two-dimensional surface representation (level-set). Level-set methods are fast, as transport source terms for the implicit surface can be solved with finite-volume opera…

The role of hydrogen for future internal combustion engines Open

Angelo Onorati, Raúl Payri, BM Vaglieco, AK Agarwal, Choongsik Bae , et al. · 2022

In order to successfully cope with the trend of mitigating climate change as outlined in the recommendations of Paris (COP21) and Glasgow (COP26) Climate Agreements, propulsion technologies must be able to achieve the highest CO2 reduction…

Synthesis gas as a fuel for internal combustion engines in transportation Open

Amin Paykani, Hamed Chehrmonavari, A. Tsolakis, Terry Alger, William F. Northrop , et al. · 2022

Numerical and Experimental Studies of a Novel Dimpled Stepped-Lip Piston Design on Turbulent Flow Development in a Medium-Duty Diesel Engine. Open

Angela Wu, Stephen Busch, Federico Perini, Seokwon Cho, Darío López Pintor , et al. · 2022

was increased dramatically [SAE 2022-01-0400]. In a previous study, a new DSL bowl was designed using non-combusting computational fluid dynamic simulations. This improved DSL bowl is predicted to promote stronger, more rotationally energe…

Spark-Assisted HCCI Residential CHP Open

Rolf D. Reitz, Lloyd Kamo, Alex Kamo, Dave Procknow, Doug Shears , et al. · 2022

A transformative small spark ignition (SI) internal combustion (IC) engine fueled with natural gas was developed for combined heat and power (CHP) applications using a combination of cycle simulations, computational fluid dynamics (CFD) mo…

Artificial Neural Network Models for Phase Equilibrium Predictions Under Engine Trans/Supercritical Spray Conditions Open

Zongyu Yue, Hongyan Zhu, Chenchen Wang, Zhen Li, Hu Wang , et al. · 2022

Parallel Load Balancing Strategies for Mesh-Independent Spray Vaporization and Collision Models Open

Federico Perini, Stephen Busch, Rolf D. Reitz, Angela Wu · 2021

Appropriate spray modeling in multidimensional simulations of diesel engines is well known to affect the overall accuracy of the results. More and more accurate models are being developed to deal with drop dynamics, breakup, collisions, an…

Impact of Active Control Turbocharging on the Fuel Economy and Emissions of a Light-Duty Reactivity Controlled Compression Ignition Engine: A Simulation Study Open

Anand Nageswaran Bharath, Rolf D. Reitz, Christopher J. Rutland · 2021

While forced induction strategies such as turbocharging can increase the power output and extend the load limit of engines operating on low temperature combustion strategies such as reactivity controlled compression ignition, the low exhau…

Reactivity controlled compression ignition engine: Pathways towards commercial viability Open

Amin Paykani, Antonio García, Mahdi Shahbakhti, Pourya Rahnama, Rolf D. Reitz · 2020

Investigation of post-injection strategies for diesel engine Catalyst Heating Operation using a vapor-liquid-equilibrium-based spray model Open

Federico Perini, Stephen Busch, Rolf D. Reitz · 2020

A Methodology for Studying the Relationship Between Heat Release Profile and Fuel Stratification in Advanced Compression Ignition Engines Open

Dan DelVescovo, Sage Kokjohn, Rolf D. Reitz · 2020

Low temperature combustion strategies have demonstrated high thermal efficiency with low pollutant emissions (e. g., oxides of nitrogen and particulate matter), resulting from reduced heat transfer losses and lean air-fuel mixtures. One su…

An Investigation of Real-Gas and Multiphase Effects on Multicomponent Diesel Sprays Open

Federico Perini, Stephen Busch, Rolf D. Reitz · 2020

Lagrangian spray modeling represents a critical boundary condition for multidimensional simulations of in-cylinder flow structure, mixture formation and combustion in internal combustion engines. Segregated models for injection, breakup, c…

A phenomenological rate of injection model for predicting fuel injection with application to mixture formation in light-duty diesel engines Open

Federico Perini, Stephen Busch, Rolf D. Reitz · 2020

Fuel injection rate laws are one of the most important pieces of information needed when modeling engine combustion with computational fluid dynamics. In this study, a simple phenomenological model of a common-rail injector was developed a…

A Visual Investigation of CFD-Predicted In-Cylinder Mechanisms that Control First- and Second-Stage Ignition in Diesel Jets. Open

Mark P. Musculus, Randy Hessel, Rolf D. Reitz · 2020

IJER editorial: The future of the internal combustion engine Open

Rolf D. Reitz, Hideyuki Ogawa, Raúl Payri, Todd D. Fansler, Sage Kokjohn , et al. · 2019

Internal combustion (IC) engines operating on fossil fuel oil provide about 25% of the world’s power (about 3000 out of 13,000 million tons oil equivalent per year—see Figure 1), and in doing so, they produce about 10% of the world’s green…

Application of an Equilibrium-Phase Spray Model to Multicomponent Gasoline Direct Injection Open

Zongyu Yue, Rolf D. Reitz · 2019

An Equilibrium Phase (EP) spray model has been recently proposed for modeling high-pressure diesel fuel injection, which is based on jet theory and a phase equilibrium assumption. In this approach, the non-equilibrium processes of drop bre…

Bowl Geometry Effects on Turbulent Flow Structure in a Direct Injection Diesel Engine Open

Stephen Busch, Kan Zha, Federico Perini, Rolf D. Reitz, Eric Kurtz , et al. · 2018

Diesel piston bowl geometry can affect turbulent mixing and therefore it impacts heat-release rates, thermal efficiency, and soot emissions. The focus of this work is on the effects of bowl geometry and injection timing on turbulent flow s…

Piston Bowl Geometry Impacts on Late-Cycle Flow and Mixing in a Small-Bore Diesel Engine. Open

Stephen Busch, Kan Zha, Federico Perini, Rolf D. Reitz · 2018

Steady-state Characterization of Particle Number Emissions from a Heavy-Duty Euro VI Engine Fueled with Compressed Natural Gas Open

Elia Distaso, Riccardo Amirante, Paolo Tamburrano, Rolf D. Reitz · 2018

The objective of the present work is to provide an exhaustive characterization of size distributions and number density of the particles emitted from a modern EURO-VI heavy-duty 4-cylinder engine, fueled with compressed natural gas. To ach…

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