Our scientific publications
A list of some of our publications, freely downloadable.
Development of numerical procedures for turbomachinery optimization
This Doctoral Thesis deals with high speed turbomachinery optimization and all those tools employed in the optimization process, mainly the optimization algorithm, the parameterization framework and the automatic CFD-based optimization loop. Optimization itself is not just a mean to improve the performance of a generic system, but can be a powerful instigator that helps gaining insight on the physic phenomena behind the observed improvements.
High performance waterjets: study of an innovative scoop inlet and development of a novel method to design ducted propellers
In the last decades the diffusion of waterjet systems for commercial applications in the high speed field is on the increase. These marine propulsors show remarkable qualities in terms of fuel consumption, noise, vibrations and manoeuvrability but they have some disadvantages which make their use optimal only for a limited speed range and which limit the overall propulsive efficiency. In the present document is described a way to modify a conventional waterjet with the aim of reducing these problems, increasing the overall efficiency.
Variable speed rotor helicopters: optimization of main rotor – turboshaft engine integration
Variable speed rotors (VSRs) represent an innovative research field for the development of new rotorcraft designs. The possibility to change the rotational speed of a helicopter rotor, as a function of the specific flight condition, makes it possible to achieve optimum performance and relevant fuel consumption reductions.
Development of an open source environment for the aero-structural optimization of wind turbines
An advanced open source optimization environment, for the design of Horizontal and Vertical Axis Wind Turbines, is hereby presented: several geometric parameters can be used as design variables while the proposed objective functions allow to run a multi-disciplinary study considering structural and aerodynamic analysis and the impact of the design on the total cost.
Design and computational fluid dynamics testing of a ducted propeller for a hovercraft vehicle propulsion system
In the following work we will show how to carry out a preliminary design of a propulsion system for a hovercraft vehicle. The study was divided into three parts: analysis of the lift sub-system, analysis of the thrust sub-system and the analysis of the blade diffuser for turning axially the air flow exiting from the propeller of the thrust sub-system. The analysis was carried out by using a program written in Matlab, and subsequently using a CFD analysis to evaluate and confirm the choices made during development of the project.
Performance of a turboshaft engine for helicopter applications operating at variable shaft speed
An off-design steady state model of a generic turboshaft engine has been implemented to assess the influence of variable free power turbine (FPT) rotational speed on overall engine performance, with particular emphasis on helicopter applications. To this purpose, three off-design flight conditions were simulated and engine performance obtained with different FTP rotational speeds were compared.
A new methodology for determining the optimal rotational speed of a variable rpm main rotor/turboshaft engine system
Variable speed rotors represent an innovative field of research for the development of new rotorcraft designs. The problems related to employing a main rotor variable speed are numerous and require an interdisciplinary approach. For this reason, a first effort has been made to understand the performance implications of coupling helicopter trim and turboshaft engine simulations.
Assessment of the engine installation performance of a redesigned tilt-rotor intake system
Designing efficient airframe aerodynamic shapes is of utmost importance to increase global rotorcraft propulsive efficiency and thus reduce fuel consumption, with particular reference to the components which affect engine performance. Optimized inlet and exhaust geometries can be obtained by coupling CFD codes with advanced optimization algorithms, automatically searching for optimal solutions among a prescribed search space. The results obtained using this methodology are here presented for the ERICA research project case.
Turboshaft engine performance comparison between cvt and fixed ratio transmission for a variable speed rotor
Variable speed rotor studies represent a promising research field for rotorcraft performance improvement and fuel consumption reduction. The problems related to employing a main rotor variable speed are numerous and require an interdisciplinary approach.
Turbojet engine performance tuning with a new map adaptation concept
Gas turbine off design performance prediction is strictly dependent on the accuracy of compressor and turbine map characteristics. Experimental data regarding component maps are very difficult to find in literature, since it is undisclosed proprietary information of the engine manufacturers. To overcome this limitation, gas turbine engineers use available generic component maps and modify them to reach the maximum adherence with the experimental measures.
Validazione di un modello numerico bidimensionale per la simulazione dell’iniezione di vapore nei combustori aeronautici
“Validation of a two-dimensional numerical model for the simulation of steam injection in aeronautical combustors“
This work presents the results of a numerical simulation of the thermo-fluid-dynamics of the combustion reaction between kerosene and air, in an aeronautical combustor operating with steam injection. The aim of the investigations is to evaluate the impact of steam injection, aimed at the reduction of NOx pollutant emissions, on the combustor performance.