Alessandro Cappelletti

Alessandro Cappelletti
University of Florence | UNIFI · Dipartimento di Ingegneria Industriale

Research Fellow

About

22
Publications
6,191
Reads
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252
Citations
Additional affiliations
February 2017 - February 2018
University of Florence
Position
  • Research Associate
January 2015 - December 2015
University of Florence
Position
  • Research Associate

Publications

Publications (22)
Article
The use of Fast Pyrolysis Bio-Oil (FPBO) as fuel was studied in a small scale non-regenerated micro gas turbine, set up in a dedicated test rig. The system includes a dedicated injection line and a modified combustor to burn efficiently high volume fractions of FPBO-in-ethanol solution. The effect of the larger combustor volume improved the quality...
Article
Modern photovoltaics and thermal technologies are widely available for the building sector at competitive prices. However, innovative approaches must be explored and implemented to find new architectural solutions at the building scale. This paper presents an electro-thermal solar concentrator and proposals for its building integration. The propose...
Article
Full-text available
The combustion of a viscous biofuel, liquefied wood (LW) produced via solvolysis of lignocellulosic biomass in acidified glycols, has been studied in a small gas turbine rig. The test rig includes a modified injection line which is compatible with acidic, viscous biofuels allowing fuel preheating and two pilot injectors, and a re-designed combustio...
Article
Hydrogen can represent an option for a low emission gas turbine if low NOx combustion systems are developed. This paper describes the design and the investigations carried out on a lean premixed burner 100% hydrogen supplied. An existing heavy-duty gas turbine burner was modified with a new axial swirler and a co-flow injection system. The designed...
Article
Full-text available
Fluid dynamic design of combustors is commonly aimed to set up swirling flows through sudden expansions to stabilise the flame. Fuel-air mixing promoted by the swirling motion also contributes to increase the reaction rate and the efficiency of the combustion process, and, consequently, to reduce pollutant emissions. Most of the experimental studie...
Article
This paper presents some practical issues and experience acquired in the design and experimental verification of a small-sized solar concentrator producing both electrical and thermal power. The device is a low-concentration photovoltaic/thermal solar system with a 20 suns (20x) concentrator factor and is suitable for integration on building roofs....
Article
Full-text available
Abstract Solar energy conversion is one promising technology to provide the building required energy. Generally, the main used technologies are the PV and thermal flat panels, but this situation provides separately electricity and thermal energy. Electrical and Thermal power combined production is available for the concentrating solar but, usually,...
Article
Full-text available
The buildings are the causes of about a third of primary energy consumption in Europe and generally, they satisfy their energy needs by the connection to the outside with a complex distribution system. The main sources for this energy production comes from the combustion of non-renewable fuels as natural gas or coal; this way presents a relevant im...
Article
Full-text available
Regenerative compressors are attractive machines used in several industrial processes. Their main characteristic is the highly three-dimensional development of the flow. Consequently, usual approach for axial or centrifugal compressors design are not an affordable strategy. The analysis of the rotor/stator coupling is the main issue in the design o...
Conference Paper
Renewable fuels have been successfully used in gas turbine combustion chambers and the layout of the chamber does not require major interventions if the composition is known. However, the variation in the composition in renewable fuels is higher than in fossil ones and it is stochastic. In principle, this variation affects the stability of the comb...
Conference Paper
Full-text available
Cavitation triggers harmful flow instabilities yielding both significant decrease of performance and reduced reliability. The aim of this paper is to investigate the accuracy of numerical methodologies for the correct prediction of cavitation inception in centrifugal pumps. Preliminary analyses are performed on the NACA 0009 hydrofoil using the ANS...
Article
Full-text available
The use of hydrogen as energy carrier in a low emission microturbine could be an interesting option for renewable energy storage, distributed generation and combined heat & power. However the hydrogen using in gas turbine is limited by the NOx emissions and the difficulty to operate safely. CFD simulations represent a powerful and mature tool to pe...
Conference Paper
Full-text available
Bio-fuels could be a interesting possibility for small CHP plants based on a Micro Gas Turbine (MGT). The aim of this study is the CFD redesign of a micro gas turbine combustor to permit pyrolysis oil (PO) combustion. The work needed to operative point modification on the gas turbine and the using of original injector, because the target different...
Conference Paper
The use of hydrogen as energy carrier in a low emission microturbine could be an interesting option for renewable energy storage, distributed generation and combined heat & power. Hydrogen can give several advantages respect to conventional fuels, i.e. natural gas, since its pollutant impact becomes mainly limited to NOx emission. However hydrogen...
Conference Paper
Full-text available
Cavitation is a fundamental issue in pump design. This topic is usually approached through costly experimental tests. The aim of this work is to apply numerical methodologies to the evaluation of the required Net Positive Suction Head in centrifugal impellers. An industrial pump from WEIR-Gabbioneta SRL has been experimentally analyzed to collect d...
Conference Paper
The use of hydrogen as derived fuel for low emission gas turbine is a crucial issue of clean coal technology power plant based on IGCC (Integrated Gasification Combined Cycle) technology. Control of NOx emissions in gas turbines supplied by natural gas is effectively achieved by lean premixed combustion technology; conversely, its application to NO...
Conference Paper
Hydrogen can represent an option for a low emission gas turbine if low NOx combustion systems will be developed. This paper describes the design and experimental investigations carried-out on a lean premixed burner prototype 100% hydrogen supplied. Starting from an existing heavy-duty gas turbine burner, the new prototype was designed by means of R...
Conference Paper
Full-text available
Hydrogen supply in gas turbine requests the development of the combustion chamber to limit the NOx emissions avoiding flash-back and auto ignition phenomena. The object under investigation is a silo combustion chamber installed on a 10 MW class heavy-duty gas turbine. The aim of the work was to investigate some modifications for the combustion cham...

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Projects

Projects (4)
Archived project
MOCAP is part of the "Energy and Environment" topic of the 2011-2013 financial framework as programmatic project for Industrial research. The project also promotes results-oriented research, as required by the "General principles for policies on research and innovation" by AIR. The project concerns the increase in pump performance using numerical modelling of cavitation. In fact, numerical modelling of realistic pump geometries and working conditions allows to studying that phenomenon during the design procedure. Careful evaluation of cavitation during the design process can lead to considerable energy savings. The main objective of the project is to include numerical modelling of cavitation in the design process. This objective will be achieved in cooperation with WEIR-Gabbioneta, a company based in Milano leader in the field of centrifugal pumps. With the support of that company, it will be possible to take advantage of industrial geometries, actual operating conditions and experimental data and to discuss the results in terms of accuracy and efficiency. Once identified the computational time of each approach and the respective accuracy, it will be defined how to implement the most effective method in the design process, leading to a significant increase in energy efficiency.