Question: A ramjet engine is designed to operate in the stratosphere. The fuel used for this jet has an autoignition temperature of ( 9 9

A ramjet engine is designed to operate in the stratosphere. The fuel used for this jet has an autoignition temperature of \(990^{\circ}\mathrm{C}\). Considering the compression effects, at what speed should the jet cruise to maintain efficient combustion? Assume the stratospheric temperature is 210 K . Use variable specific heats for your analysis.
please explain more on why t2 must be the autoignition temperature and an exact calculation for the speed at end
A ramjet engine is designed to operate in the

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