What is the principle of ramjet?

Answer 1

Compressed air is heavier and richer in oxygen than air under ordinary pressure, especially at high altitudes. Jet engines compress air to make the burning of fuel more efficient and add more mass of the air to the ejection that pushes the airplane. Most jet engines actively compress the air using turbines, but ramjets use the forward motion of the airplane to "ram" (force) air into an opening in front. Thus a degree of air compression (not as great as active compression) is achieved. Since ramjets depend on forward motion to work, an assist of some sort is required for takeoff.

Answer 2

A ramjet engine operates on the principle of supersonic combustion, where air entering the engine is compressed and ignited without the need for rotating parts like a turbojet engine. The engine relies on high-speed forward motion to compress incoming air and achieve combustion, making it more efficient at high speeds.