Einige Ergebnisse von Untersuchungen an Problemen der Super- und Hypersonischen Verbrennung (Some Results of Investigations of Problems of Super and Hypersonic Combustion),
DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V PORZ-WAHN (WEST GERMANY)
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Experimental and theoretical investigations of supersonic and hypersonic combustion processes are presently being carried out at the Institut fur Angewandte Gasdynamik of the DFVLR at Porz-Wahn. At supersonic Mach numbers external combustion is employed to generate aerodynamic side forces on a flat plate. Secondary air is injected normal to the main stream through a slot in the wall. Stable combustion in the recirculation region upstream of the slot is achieved by injecting hydrogen normal to the wall and initiating the combustion through a spark plug. At hypersonic Mach numbers the mixing process during the induction period is studied by injecting a foreign gas tangentially to the plate. In the mixing zone detailed measurements of static and stagnation pressures, total temperatures and concentration of the injected gas enable a clear picture of the flow behaviour. The experimental data obtained at hypersonic Mach numbers agree with results obtained by numerical integration of the boundary-layer equations for laminar flows. Complete flow field analysis can be obtained with this solution for chemically frozen flows and flows in chemical equilibrium approximated by a flame sheet.
- Fluid Mechanics
- Combustion and Ignition