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Will the Rotating Detonation Engines Enable Hypersonic Planes?

Disk rotating detonation engines could provide engines that are 10% more efficient, which could enable hypersonic planes. The USA, China, and Russia will be ramping up hypersonic weapon and hypersonic plane spending over ten billions per year each. Combustion can be performed in two different modes (deflagration and detonation). Deflagration is usually treated as approximately isobaric combustion. For detonation, its propagating velocity can reach the order of kilometers per second. Three kinds of detonation based engines are most studied. They are standing detonation engine (SDE), pulse detonation engine (PDE) and continuously rotating detonation engine (CRDE). * Internal combustion engines are
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