Wärmebelastung der Brennkammer eines Staustrahltriebwerks mit Überschallverbrennung

摘要

The aim of the dissertation project is the numerical simulation of the flow in a scramjet combustion chamber with diabatic walls. In order to analyze the aerothermal load on the structure and to determine the energy loss of the flow, an integrated fluid-thermal-structural analysis is performed. Of special interest is the mutual influence of flow and temperature boundary layer as well as the aerodynamic heating rate. For modeling the energy boundary condition at the wall, a coupled analysis of the heat transfer within the multi-layer wall material is conducted. Within the fluid, the unsteady compressible conservation equations are solved using a Galerkin finite-element method on adaptive hybrid grids. In addition to the flexible unstructured triangular elements, semi-structured quadrilaterals are employed to better resolve the viscous layers near solid walls. Due to the fact that a nonreactive one-component fluid is considered, the heat addition due to the combustion process is modeled by a heat source distribution according to a one-dimensional combustion model. An algebraic as well as a low Reynoldsnumber q-omega turbulence model are applied to account for the influence of turbulence on the heat transfer. The same finite-element method is applied to the conservatively coupled solution of the structural conservation equation. Measurements obtained by the experimental combustion chamber of the German-Russian Hypersonic Technology Program are used to validate the computations.