Why are low-bypass turbofan engines used for supersonic flight and not high-bypass turbofans? Aren’t high-bypass turbofan engines more efficient?

Question

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In: 6

Answer 1

The fan part of a turbofan is essentially a ducted propeller. Propellers lose their efficiency very quickly at high speeds, so they don’t really work at higher than mach speeds and that may also generate shock waves that tear them apart.