Experimental study on staged injection in a supersonic combustor

At the supersonic combustion test facility of the Institute of Flight Propulsion of the Technische Universitaet Muenchen experimental investigations on staged injection were conducted. In the model combustor a central strut injection system which was investigated at the Institute for the last years served as the first stage. As second stage wall injectors with a single injection hole were used. First, an investigation concerning the ignition and flame stabilization capabilities of three different strut injectors was conducted. In addition one injector was studied in more detail in combination with the second stage. By means of the measured pressure distribution along the combustor wall and visual observation the ignition of the second stage, the flame stabilization and the interaction between the two stages was examined depending on different equivalence ratios. Furthermore, the results of the experiments were post processed using an one dimensional preliminary design tool.