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The exhaust flow of a Pulse Detonation Combustor (PDC) is investigated fordifferent operating conditions. The PDC consists of two units, the deflagrationto detonation transition section and the exhaust tube with a straight nozzle.High-speed high-resolution schlieren images visualize the shock dynamicsdownstream of the nozzle. The flow dynamics during one full PDC cycle isexamined via high-speed Particle Image Velocimetry. A well-suited solid tracerparticle for supersonic reactive flow is determined in a preliminary study tominimize the PIV measurement error. The investigated operating conditions ofthe PDC differ in fill-fraction, which is the percentage of the tube filledwith a reactive mixture. With increasing fill-fraction, the flow features growin size and strength, as the propagation velocity of the leading shockincreases. The blow down process of the PDC is characterized by several exhaustand suction phases. An increase in fill-fraction results in a stronger firstexhaust phase, while the subsequent suction and exhaust phases remain almostunaffected.

Investigation of the Exhaust Flow of a Pulse Detonation Combustor at different Operating Conditions based on High-Speed Schlieren and PIV