Description of the computations for three-dimensional nonaxisymmetric nozzles and analysis of the flowfields are presented in this paper. Two different types of nozzles are investigated for con~pressible flows at high Reynolds numbers. These are the single-expansionramp and scramjet nozzles. The computation for the single-expansion-ramp nozzle focuses on the condition of low pressure ratio, whi...

Scramjets have become a main focus of study for many researchers, due to their application as propulsive devices in hypersonic flight. This entails a detailed understanding of the fluid mechanics involved to be able to design and operate these engines with maximum efficiency even at their off-design conditions. It is the objective of the present cold-flow investigation to study and analyse expe...

Computational fluid dynamical simulations were carried out for a number of different scramjet configurations, which differed in their values for the location and angle of the thrust surface. These configurations were investigated experimentally in free-piston shock tunnel tests. The comparison between simulations and experiments indicated that the code successfully predicted the pressure levels...

In a previous paper1 the author and co-workers reported an unexpected numerical behavior in the simulation of dual-mode scramjet combustors. Under conditions of perfect symmetry in geometry, grid and boundary conditions, computational fluid dynamic (CFD) calculations showed an asymmetric response when a shock-train/separated-flow system was present in the flowfield. Other researchers using a co...

São descritos os princípios de funcionamento da tecnologia scramjet e suas aplicações ao transporte hipersônico para voo na estratosfera acesso espaço. Comparam-se vantagens desvantagens do uso hidrogênio como combustível em relação aos hidrocarbonetos. Discutem-se problemas atinentes à proteção térmica, mistura – ar estabilização chama. Para finalizar, apresentam-se alternativas solução desses...