results: cycle analysis of PDE

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Figures shown right are the results of numerical analysis of PDE cycle, such as combustion, exhaustion and fuel injection. Ignition in 1st cycle has already been performed by assuming a CJ detonation obtained from one-dimensional analysis. The 1-D CJ detonation is perturbed into a 2-D detonation in a short "DDT distance", propagating toward downstream end.

combustion exhaustion fuel injection operation processes of PDE cycle

Thereafter, the detonation front leaves the channel, followed by burnt gas exhaust from the channel; at the instant when the head-end pressure is equal to the ambient pressure, the fresh fuel mixture starts flowing from the intake ports for the 2nd cycle.

Figure shown left is a bar graph of the ratio between each process and complete cycle. The ratio of the time required for each process in one cycle (combustion, exhaust and fuel injection) does not depend on PDE length, that is, ratio of the time required for each process is fixed though the length of PDE changes.

Moreover, the one cycle time can easily be estimated; the cycle time is closely proportional to PDE length.

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