A rocket is in the form of a cylindrical closed at the lower
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Answer:-
The exhaust runs through the engine nozzle, which is a converging diverging shape. This is also known as a “de Laval nozzle.” Fluid flows from high pressure at the “throat” end through to low pressure on the other end. In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. This explains why the fluid is manipulated and accelerated as a result of flowing from the throat end to the wide end of the exhaust nozzle and explains why the engine nozzle has to be a “cone” shape. For subsonic flow, as the flow area gets smaller, the flow velocity goes up, and for supersonic flow, as the flow area gets larger, the flow velocity goes up.
If the nozzle is made longer and wider, the exhausting gas goes faster. This is why rocket engines have big divergent nozzles. However, there are limits. Bigger nozzles are heavier nozzles, so at some point, the gain in engine performance is offset by a decrease in vehicle performance. This puts limitations on how fast we can theoretically go.
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