Pulse detonation engines operate on a fill-detonate-exhaust cycle with thrust directly proportional to the cycle frequency. That is, a decrease in cycle time results in increased thrust. This paper shows that the detonate portion of the cycle can be shortened by using a branched detonation as the ignition source as opposed to a spark plug type of ignition. The combustion energy from a branched detonation allows ignition and deflagration-todetonation transition to occur more quickly, shortening overall cycle time. Further, while detonation branching has been previously accomplished using gaseous hydrogen fuel, this paper reports the first application of detonation branching using liquid hydrocarbon fuel. For this application, a pressurized heating system was designed to vaporize the fuel and mix it with an airstream to stoichiometric conditions.
Pulse detonation engines operate on a fill-detonate-exhaust cycle with thrust directly proportional to the cycle frequency. That is, a decrease in cycle time results in increased thrust. This paper shows that the detonate portion of the cycle can be shortened by using a branched detonation as the ignition source as opposed to a spark plug type of ignition. The combustion energy from a branched detonation allows ignition and deflagration-todetonation transition to occur more quickly, shortening overall cycle time. Further, while detonation branching has been previously accomplished using gaseous hydrogen fuel, this paper reports the first application of detonation branching using liquid hydrocarbon fuel. For this application, a pressurized heating system was designed to vaporize the fuel and mix it with an airstream to stoichiometric conditions.
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