Aerodynamic characterization of hypersonic transportation systems and its impact on mission analysis

This paper aims to provide technical insights on the aerodynamic characterization activities performed in the field of the H2020 STRATOFLY project, for the Mach 8 waverider reference configuration. Considering the complexity of the configuration to be analyzed at conceptual/preliminary design stage, a build-up approach has been adopted. The complexity of the aerodynamic model increases incrementally, from the clean external configuration up to the complete configuration, including propulsion systems elements and flight control surfaces. At each step, the aerodynamic analysis is complemented with detailed mission analysis, in which the different versions of the aerodynamic databases are used as input for the trajectory simulation. eventually, once the contribution to the aerodynamic characterization of flight control surfaces is evaluated, stability and trim analysis is carried out. The comparison of the results obtained through the different mission analysis campaigns clearly shows that the accuracy of aerodynamic characterization may determine the feasibility or unfeasibility of a mission concept

Giardia and Cryptosporidium spp. in lakes and groundwaters of Campania Region, Italy [Sulla diffusione di Giardia spp. e Cryptosporidium spp. in acque lacustri e telluriche della Campania]

This paper presents the results of a survey on the occurence of Giardia cysts and Cryptosporidium oocysts in lakes and groundwaters of Volturno watershed in Campania Region, Italy. A total of 23 samples from 5 lakes and 13 wells were analyzed in the period June-December 1997 using the UK standard methodology (Standing Committee of Analysts, Department of Environment, Drinking Water Inspectorate). The results showed that both protozoa are widely dispersed in the lakes, particularly in the fall, and that the potential for Giardia and Cryptosporidium contamination of groundwaters is real. The Authors conclude outlining the need to develop appropriate control strategies and preventive programs in communities using groundwater sources as drinking water

Heat transfer modeling for supercritical methane flowing in rocket engine cooling channels

Abstract To investigate the methane behavior inside rocket engine cooling channels, a test article has been specifically designed by the Italian Aerospace Research Center. In this study, the expected wall and coolant behavior of this test article is analyzed by a three-dimensional conjugate heat transfer model. Different coolant pressure and surface roughness levels are considered in order to understand their influence on the heat transfer capability of the cooling system. Results show that heat transfer deterioration may occur in principle when methane is operated in near-critical condition. However, the resultant wall temperature peak reduces for increasing coolant pressure and for increasing surface roughness