variavel0=<b>Eliseu Reinaldo Moraes Vieira</b> - eliseu@iae.cta.br Centro Técnico Aeroespacial
<b>Luiz Carlos Sandoval Góes</b> - goes@mec.ita.br Instituto Tecnológico de Aeronáutica
<b>Abstract.</b> The analysis of a complex systems in a unified way, where several branches of the engineering are involved , is a very hard task. However, by means of the bond graphs methodology, invented by Henry Paynter in 1959, there is the possibility for coupling distinct domains, making possible the analysis and dynamical simulation of these systems. The present work shows a computational simulation of the Liquid Rocket Engine (LRE),and its main components, through bond graphs techniques. This technique is applied to model several LRE subsystems, belonging to different energy domains which are dynamically coupled and interact with each other. In this analysis a dynamic bond-graph model is presented to study the interaction of the thermal domain (combustion chamber), hydraulic (injectors block and the propellant feedlines) An analysis for valve synthesis is also included.. This study shows that, the bond graph technique, although based on a lumped parameter model, in which the physical reality of the element is embodied, is extremely powerful during the preliminary phase for developing a complex LRE system.
<b>Keywords.</b> Bond graphs, Liquid Rocket Engines, Dynamical Simulation.