Which outcome results when exceeding the flame speed limit in a pulse detonation engine?

💡 Explanation

Exceeding flame speed limits in a PDE can lead to an uncontrolled deflagration because of the onset of the deflagration-to-detonation transition (DDT), leading to unstable combustion rather than sustained supersonic burning. Therefore, deflagration occurs rather than controlled propulsion because the DDT threshold is surpassed.

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