A5010724289- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Vehicle emissions and performance
- Hydraulic and Pneumatic Systems
- Biodiesel Production and Applications
- Real-time simulation and control systems
- Engineering Applied Research
- Combustion and Detonation Processes
- Aerodynamics and Fluid Dynamics Research
- Catalytic Processes in Materials Science
- Aerosol Filtration and Electrostatic Precipitation
- Electric and Hybrid Vehicle Technologies
- Wind and Air Flow Studies
- Heat transfer and supercritical fluids
- Technical Engine Diagnostics and Monitoring
- Rocket and propulsion systems research
- Cyclone Separators and Fluid Dynamics
- Engine and Fuel Emissions
- Turbomachinery Performance and Optimization
- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- Vehicle Dynamics and Control Systems
- Industrial Technology and Control Systems
- Plasma and Flow Control in Aerodynamics
- Vehicle Noise and Vibration Control
University of Malta
2023-2024
Polytechnic University of Turin
2003-2012
St. John's University
2012
University of Catania
2008
Abstract Communicating the scientific consensus that human-caused climate change is real increases beliefs, worry and support for public action in United States. In this preregistered experiment, we tested two messages, a classic message on reality of an updated additionally emphasizing agreement crisis. Across online convenience samples from 27 countries ( n = 10,527), substantially reduces misperceptions d 0.47, 95% CI (0.41, 0.52)) slightly beliefs (from 0.06, (0.01, 0.11) to 0.10, (0.04,...
Fundamental aspects of Common Rail (CR) fuel-injection-system dynamics were investigated, paying specific attention to the wave propagation induced pressure oscillations and their relationships with system control parameters multiple-injection performance. A detailed experimental analysis pressure-wave phenomena in a last-generation CR Multijet equipment solenoid type was carried out on high performance new test-bench Moehwald-Bosch MEP2000-CA4000 under real engine simulated conditions. The...
Fundamental aspects of Common Rail (C.R.) fuel-injection system dynamics were investigated, paying specific attention to the wave propagation induced pressure oscillations and their relationships with control parameters multiple-injection performance. A detailed experimental analysis phenomena in a last-generation C.R Multijet equipment solenoid type was carried out on high performance new test bench Moehwald-Bosch MEP2000-CA4000 under real engine simulated conditions. The results include...
A rather complete mathematical model for a common-rail injection-system dynamics numerical simulation was developed to support experimentation, layout, and control design, as well performance optimization. The thermofluid of the hydraulic-system components, including rail, connecting pipes, injectors modeled in conjunction with solenoid-circuit electromagnetics mechanics mobile elements. One-dimensional flow equations conservation form were used simulate wave propagation phenomena throughout...
In “multijet” common rail (CR) diesel injection systems, when two consecutive current pulses approach each other, a merging of the injections into single one can occur. Such an “injection fusion” causes undesired excessive amount injected fuel, worsening both fuel consumption and particulate emissions. order to avoid this phenomenon, lower limits dwell-time values are introduced in control unit maps by conservatively overestimated threshold, which reduces flexibility multiple-injection...
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...
An experimental-theoretical study has been carried out on high-pressure volumetric radial-piston pumps for diesel fuel injection systems. The dependence of the pump inducted flow rate speed and load was investigated characteristic curve cooling-lubrication circuit derived. head-capacity curves were determined different types at revolution speeds compared with injector requirements in order to evaluate pressure-control strategy efficiency. insight into ageing effects performance also...
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...
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)...
The combustion propagation and burned-gas expansion processes in a bi-fuel CNG SI engine were characterized by applying newly developed diagnostic tool, order to better understand how these are related the fuel composition, operating variables as well exhaust emissions. tool is based on an original multizone heat-release model that coupled with CAD of containing surface for computation burning speed mean velocity. Furthermore, thermal prompt NO sub-models, embedded code, employed study...
In addition to the frequently used statistical ensemble-average, non-Reynolds filtering operators have long been proposed for nonstationary turbulent quantities. Several techniques reduction of velocity data acquired in cylinder internal combustion reciprocating engines developed by various researchers order separate “mean flow” from “fluctuating motion,” cycle cycle, and analyze small-scale engine turbulence methods. Therefore a thorough examination these detailed comparison between them...
A general conservative numerical model for the simulation of transmission-line unsteady fluid dynamics has been developed and applied to high-pressure injection systems. comprehensive thermodynamic approach modeling acoustic cavitation, i.e., cavitation induced by wave propagation, was proposed on basis a homogeneous two-phase barotropic flow pure liquid, its vapor, gas, both dissolved undissolved. physically consistent sound speed equation set in closed analytical form wide application. For...
An innovative hydraulic layout for Common Rail (C.R.) fuel injection systems was proposed and realized. The rail replaced by a high-pressure pipe junction in order to obtain faster dynamic system response during engine transients, smaller pressure induced stresses sensibly reduced production costs. Compared commercial accumulator, whose internal volume ranges from 20 40 cm3, such provided capacitance of about 2 cm3 had the main function connecting pump delivery electroinjector feeding pipes....
A refined two-zone heat release model for combustion diagnostics in spark-ignition (SI) engines was developed and assessed. The novelty of the includes following improvements. more general complex-variable formulation Newton's convection law applied modeling instantaneous surface-averaged flux so as to take unsteadiness gas-wall temperature difference into account. CAD procedure introduced estimate heat-transfer wall areas burned- unburned-zone assigned geometric features flame front. energy...