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The axial compressors used in jet engines have their blade heights in decreasing order in the direction of the flow.

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The blade size reduction is to achieve large pressure rises.the pressure is proportional to the volume.Axial flow compressors produce a continuous decelerating flow of compressed gas,for high efficiency and large mass flow rate, particularly in relation to their cross-section.the casing around these blades also reduces.high-pressure gas enters a turbine, where it expands down to the exhaust turbine.

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  • $\begingroup$ + Right. As the air is squeezed, its volume decreases. $\endgroup$ Feb 2 '14 at 16:40

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