One concept for hypersonic air-breathing propulsion is a detonation-combustion RAMJET, in which fuel added to the air burns in a detonation wave. As a simplified model for analysis of such a device, assume that the standing detonation can be modeled as a normal shock wave followed by a region of constant-area heat addition that

This resulting in a substantial drop in the engine airflow and the net thrust.

Explanation:

A ramjet is a type of the flying stovepipe or a hyper-sonic air-breathing propulsion and uses the engine motion to compress incoming air with an axial compression and employs a continuous combustion process.  As the speed of the jet increase, the efficiency of the ramjet starts to drops and temperature increase with the combustion.

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Answerweathering;