This paper aims to develop the aerodynamical design and the geometric detrmination of a low veñocities wind tunnel. Was elected an Eiffel type open wind tunnel, according to the required conditions in the test chamber, such as the area and maximum air velocity in the test section; we propose the constructive layout with the tunnel elements and the geometry of them. We performe calculations to determine the flow veloctiy, the cross section and the aerodynamical losses in the characteristic sections of the instalation. We determine the required fan power and it’s selection according to the local market conditions.

This work shows a thermodynamical analysis of a simplified cogeneration system for combined production of electricity and proccess heat. Due to increase of energetic demands, we propose a themodynamics schema based on a steam turbin working in conditions of thermic parity. We describe the thermal and thermal-economics calculations methodology of the system. We compare the thermaleconomics indexes using two types of combustible: natural gas and glycerol (methyled), and through the results obtained, is possible to compare the joint production prices of electricity and heat for the two combustibles proposed.

The Y type injectors are classified as internal mixture injectors and are very useful in industries.The calculation methods are based on the sonic flux conditions to enter to mixture chamber. Inthis work, we present a calculation method for these injectors in the subsonic regime where theoperation conditions such as the injector geometry, the pressure and temperature conditions,the properties and mass spend of gaseous and liquid fuel of atomization are known. Underthese conditions, an analysis of Wigg equation -which determine the drops mean diameter-,show that, in the critic regime only permit us to obtain the lesser spray drops mean diameter.For any other condition, the atomization gas flows under a subsonic regime and the drop meandiameter is greater that the minimum value. Also, we compare between different equationswhich define the drop mean diameter in differents variants of Wigg e...