Gianluigi Alberto Misté

Nablawave

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 av...

View Video Presentation: https://doi.org/10.2514/6.2021-2952.vid The Clean Sky Joint Technology Initiative (JTI) within the EU Horizon 2020 Framework Programme proposes to introduce new concept aircraft and rotorcraft to replace reference technology counterparts at different time scales (2020/2035/2050). An increasing global demand for efficient ai...

The extended Clean Sky Joint Technology Initiative (JTI) within the EU Horizon 2020 Framework Programme [Ref. 1] proposes to introduce a number of concept aircraft and rotorcraft to replace reference technology counterparts at different time scales (2020/2035/2050). This Clean Sky 2 (CS2) promotes the importance of those concept configurations and...

One of the main issues that prevents the widespread use of hybrid propulsion is the low regression rate of classical hybrid fuels. Recently, paraffin-based fuels have been proposed as a viable solution; however, concerns about paraffin thermomechanical properties have often been seen as a possible showstopper. A small-scale hybrid rocket, able to b...

Hybrid rockets technology is growing in interest in recent years. The main reasons of this renewed interest is that hybrid rocket motors are simple, safe to develop and operate, reliable, green and less expensive than traditional propulsive technologies (solids and liquids). Another peculiar feature of hybrid rocket motors is throttleability, i.e....

Hybrid rocket motors have several potential advantages with respect to current used propulsion systems (i.e. solids and liquids): simplicity, safety, reliability, environmental friendliness, lower cost. One of the main issues that prevents the widespread use of hybrid propulsion is the low regression rate of classical hybrid fuels. Recently, paraff...

Hybrid rocket motors have several potential advantages respect to current used propulsion systems (i.e. solids and liquids) like simplicity, safety, reliability, environmental friendliness, lower cost. A particular positive feature of hybrid rockets is the possibility to control the thrust level operating only on the oxidizer mass flow. Thanks to t...

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. There are two main variable-speed concepts, depending on the type of transmission employed: fix...

Variable speed rotors represent an innovative research field for the development of new rotorcraft designs. Issues related to employing a main rotor variable speed are numerous and require an interdisciplinary approach. For this reason, a preliminary effort has been made to understand the performance implications of coupling helicopter trim and tur...

The power required to fly a rotorcraft, and consequently the fuel burn and CO2 emissions are strongly dependent on the design of its airframe and of non-lifting rotating parts such as the main and tail rotor shaft, control system and hub. In line with the EU environmental objectives for 2020 the Clean Sky Green Rotorcraft Programme aims at reducing...

Variable speed rotor studies represent a promising research field for rotorcraft performance improvement and fuel consumption reduction. The turboshaft engines employed to drive helicopter rotors usually operate at a constant design speed, within a narrow RPM range. One of the reasons for choosing a constant speed is linked to free power turbine (F...

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 av...

TurboExpo 2014 Poster

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. There are two main variable speed concepts, depending on the type of transmission employed: fix...

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...

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...

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,...

Compressor map interpolation is usually performed through the introduction of auxiliary coordinates ( β ). In this paper, a new analytical bivariate β function definition to be used in compressor map interpolation is studied. The function has user-defined parameters that must be adjusted to properly fit to a single map. The analytical nature of β...