A5086139474- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Catalytic Processes in Materials Science
- Heat transfer and supercritical fluids
- Thermochemical Biomass Conversion Processes
- Atmospheric chemistry and aerosols
- Biodiesel Production and Applications
- Catalysis and Oxidation Reactions
- Combustion and Detonation Processes
- Fire dynamics and safety research
- Rocket and propulsion systems research
- Vehicle emissions and performance
- Industrial Gas Emission Control
- Scientific Computing and Data Management
- Advanced Data Processing Techniques
- Radiative Heat Transfer Studies
- Fault Detection and Control Systems
- Semantic Web and Ontologies
- Catalysts for Methane Reforming
- Numerical methods for differential equations
- Power System Optimization and Stability
- Research Data Management Practices
- Environmental and Industrial Safety
- Big Data and Business Intelligence
- Lignin and Wood Chemistry
Politecnico di Milano
2015-2024
Mylan (Switzerland)
2020
Curculio Institute
2019
University of Milan
2015-2016
Stanford University
2016
ABSTRACT The kinetic modeling of the pyrolysis and combustion liquid transportation fuels is a very complex task for two different reasons: challenging characterization mixture several hydrocarbon isomers complexity oxidation mechanisms large oxygenated molecules. While surrogate mixtures reference components allow to tackle first difficulty, behavior mostly overcome by reducing total number involved species adopting lumping approach. After investigation (gasoline, kerosene, diesel fuels),...
A wide-range experimental and theoretical investigation of ammonia gas-phase oxidation is performed, a predictive, detailed kinetic model developed.
The oxidation of neat methane (CH4) and CH4 doped with NO2 or NO in argon has been investigated a jet-stirred reactor at 107 kPa, temperatures between 650 1200 K, fixed residence time 1.5 s, for different equivalence ratios (Φ), ranging from fuel-lean to fuel-rich conditions. Four diagnostics have used: gas chromatography (GC), chemiluminescence NOx analyzer, continuous wave cavity ring-down spectroscopy (cw-CRDS) Fourier transform infrared (FTIR). In the case methane, onset temperature was...
Understanding the chemistry behind oxidation of ammonia/hydrogen mixtures is crucial for ensuring flexible use such in several applications, related to propulsion systems and power generation. In this work, blends was investigated through an experimental kinetic-modeling study, where low- intermediate-temperature conditions were considered. An campaign performed a flow reactor, at stoichiometric near-atmospheric pressure (126.7 kPa). The mole fraction fuels, oxidizer final products measured....
When it comes to handling large hydrocarbon molecules and describing the pyrolysis combustion behavior of complex mixtures, potential limitations detailed chemistry require a careful investigation. Indeed, as they involve number species reactions, kinetic mechanisms often make model predictions computationally expensive, thus strongly restricting their potential. Therefore, automatic generation with several thousands molecular elementary very useful in many circumstances prerequisite derive...
The low- and high-temperature oxidation mechanisms of n-heptane have been extensively studied in recent past literature because its importance as a primary reference fuel. Recent advanced analytical methods allowed for the identification several intermediate oxygenated species at very low-temperature conditions jet-stirred reactors. On these bases, new classes successive reactions involving hydroperoxide species, already discussed propane n-butane oxidation, were included mechanism...
In this work, we propose a novel data-driven approach for detailed kinetic mechanisms optimization. The is founded on curve matching-based objective function and includes methodology the optimisation of pressure-dependent reactions via logarithmic interpolation (PLOG format). order to highlight advantages new formulation function, comparison with L1 L2 norm performed. selection impactful carried out by introducing Cumulative Impact Function (CIF), while an Evolutionary Algorithm (EA) adopted...
The influence of the addition ammonia on oxidation methane was investigated both experimentally and numerically. Experiments were carried out at atmospheric pressure, using a fused silica jet-stirred reactor, recrystallized alumina tubular reactor designed purpose to reach temperatures as high ∼2000 K. A temperature range 600–1200 K in residence time 1.5 s, while experiments flow between 1200 2000 K, for fixed about 25 ms reactive zone. methane/ammonia mixture, diluted helium, used reactors...
Abstract The numerical investigation of quenching distances in laminar flows is mainly concerned with two setups: head-on (HOQ) and side-wall (SWQ). While most the work has been conducted for HOQ good agreement between simulation experiment, far less analysis done SWQ. Most SWQ simulations used simplified diffusion models or reduced chemistry achieved reasonable experiments. However, it found that setup differ from experimental results if detailed chemical reaction mechanisms are employed....
Fully-resolved simulations of the heating, ignition, volatile flame combustion and char conversion single coal particles in convective gas environments are conducted compared to experimental data (Molina Shaddix, 2007). This work extends a previous computational study (Tufano et al., 2016) by adding significant level model fidelity generality, particular with regard particle interior description heterogeneous kinetics. The considers elemental analysis given interpolates its properties linear...
Fast-pyrolysis bio-oils (FPBOs) obtained from lignocellulosic biomass are gaining attention as sustainable fuels for various applications, including the transport sector and power production. A significant fraction of is constituted by nitrogen-containing compounds (N fuels) that should be considered when developing surrogate models FPBOs. Moreover, content N in FPBOs expected to strongly contribute production nitrogen oxides (NOx) directly fuel-bound (fuel NOx), addition thermal NOx...
Nowadays, detailed kinetics is necessary for a proper estimation of both flame structure and pollutant formation in compression ignition engines.However, large mechanisms the need to include turbulence/chemistry interaction introduce significant computational overheads.For this reason, tabulated employed as possible solution reduce CPU time even if table discretization generally limited by memory occupation.In work authors applied homogeneous reactors (HR) combination with different...
Benzaldehyde is an aromatic aldehyde commonly considered in bio-oil surrogate formulation, and important intermediate the oxidation of other reference fuels such as toluene. However, its has never been previously investigated experimentally no product formation profiles were reported very limited pyrolysis studies available literature. In this study, gas-phase benzaldehyde was a jet-stirred reactor. 48 species detected using gas chromatography, mainly CO, CO2 phenol. The CO phenol indicates...
The study utilizes two spherical bombs to explore the Laminar Flame Speed (LFS) and Markstein length of oxygen-enriched ammonia flames combined with different oxidizers (N2 21% 30% O2 He O2). experiments cover a range initial conditions, exploring temperatures from 309 K 423 an equivalence ratio spanning 0.8 1.3, all at pressure 1 bar. At same time, three established literature mechanisms (Stagni, Shrestha, Zhang) are used simulate data perform kinetic analysis. A detailed analysis focuses...
The kinetic mechanisms describing the combustion of longer-chain fuels often have limited applicability due to high number species involved in their pyrolysis and oxidation paths. In this work, is addressed for what concerns oxymethylene ethers (OMEn), which recently emerged as synthetic fuel candidates diesel applications. Starting from an established mechanism representing dimethoxymethane DMM or OME1, chemistry heavier OMEs up OME5 was developed by relying on reaction classes, where...