Hydrogen-powered mobility is believed to be crucial in the future, as hydrogen constitutes a promising solution make up for non-programmable character of renewable energy sources. In this context, hydrogen-fueled internal combustion engine represents one suitable technical solutions future sustainable mobility. As matter fact, engines suffer from limitations volumetric efficiency due very low density fuel. Consequently, ICEs can reach sufficient torque and power only if supercharging are...

The potential of internal EGR (iEGR) and external (eEGR) in reducing the engine-out NOx emissions a heavy-duty diesel engine has been investigated by means refined 1D fluid-dynamic model developed GT-Power environment. is equipped with Variable Valve Actuation (VVA) Geometry Turbocharger (VGT) systems. activity was carried out frame CORE Collaborative Project European Community, VII FP. integrates an innovative 0D predictive combustion algorithm for simulation HRR (heat release rate) based...

Natural gas is a promising alternative fuel for internal combustion engine application due to its low carbon content and high knock resistance.Performance of natural engines further improved if direct injection, turbocharger boost level, variable valve actuation (VVA) are adopted.Also, relevant efficiency benefits can be obtained through downsizing.However, mixture quality resulting from injection has proven problematic.This work aims at developing mono-fuel small-displacement turbocharged...

The present paper provides a contribution to the CFD modelling of reacting flows in IC engines fueled with natural gas. Despite fact that gas has been widely investigated into last decades, literature still lacks reliable models and correlations be exploited so as efficiently support design internal combustion engines. deals development an accurate model, capable capturing effects engine working conditions mixture compositions on process. model is based Extended Coherent Flame Model coupled...

In multijet common rail (CR) systems, the capability to manage multiple injections with full flexibility in choice of dwell time (DT) between consecutive solenoid current pulses is one most relevant design targets. Pressure oscillations triggered by nozzle closure after each injection event induce disturbances amount fuel injected during subsequent injections. This causes a remarkable dispersion mass when DT varied. The effects hydraulic circuit layout CR systems were investigated objective...

A new multizone premixed-diffusive combustion model has been developed, assessed, and applied to diagnose the burning process emission formation in a conventional premixed charge compression ignition (PCCI) diesel engine. The is based on Dec conceptual scheme, which considers as two-stage quasi-steady process: All fuel particles undergo first rich phase, products complete their oxidation close-to-stoichiometric conditions at jet periphery through diffusion flame. chamber contents have...

The target of net-zero emissions set by the 2015 Paris Agreement has strongly commissioned energy production sector to promote decarbonization, renewable sources exploitation, and systems efficiency. In this framework, utilization hydrogen as a long-term carrier great potential. This paper is concerned with combustion characterization in non-premixed gas turbine burner, originally designed for natural gas, when it fed NG-H2 blends featuring content from 0 50% volume. final aim retrofit 40 MW...

During the last few years, integration of CFD tools in internal combustion (IC) engine design process has continually increased, allowing time and cost savings as need for experimental prototypes diminished. Numerical analyses IC flows are rather complex from both conceptual operational sides. In fact, these involve a variety unsteady phenomena right balance between numerical solution accuracy computational should always be reached. The present paper is focused on modeling natural gas (NG)...

An experimental investigation and a burning-rate analysis have been performed on production 1.4 liter compressed natural gas (CNG) engine fueled with methane-hydrogen blends. The features pent-roof combustion chamber, four valves per cylinder, centrally located spark plug. tests carried out in order to quantify the cycle-to-cycle cylinder-to-cylinder variation. Therefore, has equipped dedicated piezoelectric pressure transducers placed each cylinder by At test point, in-cylinder pressure,...

An experimental investigation was performed on a turbocharged spark-ignition 4-cylinder production engine fuelled with natural gas and two blends of hydrogen (15% 25% in volume H2). The purposely designed to give optimal performance when running CNG. first part the campaign carried out at MBT timing under stoichiometric conditions: load sweeps constant speed were performed. Afterwards, spark advance relative air/fuel ratio acquired load. three fuels compared terms (fuel conversion...

An innovative 0D predictive combustion model for the simulation of HRR (heat release rate) in DI diesel engines was assessed and implemented a 1D fluid-dynamic commercial code Fiat heavy duty engine equipped with Variable Geometry Turbocharger system, frame CORE (CO2 reduction long distance transport) Collaborative Project European Community, VII FP. The approach starts from calculation injection rate profile on basis injected fuel quantities parameters, such as start energizing time, taking...

The present paper is the result of a cooperation between Politecnico di Torino and AVL List Gmbh within recent collaborative research project funded by EC. work was focused on experimental numerical characterization mixture formation, combustion, emissions in direct-injection NG engines, to draw useful indication for design innovative, high-performance engine concepts. As matter fact, IC engines running are believed be competitive transition solution towards sustainable mobility scenario,...

The simulation of heat release, flame propagation speeds, and pollutant formation was carried out in both a turbocharged compressed natural gas (CNG) engine multivalve naturally aspirated bifuel running on either CNG or gasoline. predictive tool used for investigation is based an enhanced fractal geometry concept the front, which able to capture modulation turbulent laminar burning speed ratio throughout overall combustion phase without introducing kernel growth burnout submodels. prediction...