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Marchetti M.,TEMIS S.r.l. | Marrocchi L.,TEMIS S.r.l. | Spadoni M.,TEMIS S.r.l. | Costa F.,TEMIS S.r.l. | And 4 more authors.
2014 IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2014 - Proceedings | Year: 2014

In the frame of EXOMARS 2016 Mission, TEMIS and Centro Interdipartimentale di Studi e Attività Spaziali G. Colombo (CISAS) have developed a very modular sub-system, named Central Electronic Unit (CEU), that has the main objective of handle, acquire and transmit medium and low rate data, coming from sensors devoted to investigate the Martian atmosphere. Thanks to the high modularity of the architecture, CEU is very easy to customize in order to be used in different missions as data handling platform to interface with several types of equipments or intrumentations. © 2014 IEEE.

Bellomo N.,University of Padua | Bellomo N.,Centro Interdipartimentale Of Studi E Attivita Spaziali G Colombo | Lazzarin M.,University of Padua | Lazzarin M.,Centro Interdipartimentale Of Studi E Attivita Spaziali G Colombo | And 8 more authors.
Journal of Propulsion and Power | Year: 2014

This paper describes computational fluid dynamics applied to the analysis of a hybrid rocket motor with a diaphragm in the combustion chamber to enhance rocket performance. This work follows the last author's experiments: An engine was tested with nitrous oxide and paraffin wax as propellants. Several of the tests have been used as references for numerical simulations. The following approximations have been made: steady-state conditions, eddy dissipation model with one-step reaction, gaseous injection of fuel and oxidizer, and no droplets entrainment (typical of a paraffin grain). First of all, a single geometry without a diaphragm has been analyzed with different turbulence models (k-ω, k-ω shear stress transport, k-ε, k-ε renormalization group). It has been shown that the k-ω model predicts a lower flame temperature and chamber pressure than the k-ε model. Then, five geometries have been studied to compare two different types of diaphragms (one hole and four holes) in two positions (24 and 33% of the total length) to a configuration without any mixer. The effect of the diaphragmis to increase the mixing of the chemical species participating in the combustion process. The use of the diaphragm causes a performance enhancement, as shown in the experimental study. There is a good agreement between computational fluid dynamics results and experimental data: The efficiency is overestimated by less than 5.5%. This work proves the capability of computational fluid dynamics to predict global hybrid rocket performance: It can be considered as a useful tool in the study of mixing devices. © 2012 AIAA.

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