Can a Convergent Nozzle Achieve High Pressure with Subsonic Exit Velocity?

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A convergent nozzle can achieve high pressure with subsonic exit velocity, but the maximum inlet pressure is limited by the critical pressure ratio, which for air is approximately 1.89 times the outlet pressure. Bernoulli's equation applies only to incompressible flows, and for air, it remains valid until velocities approach 0.3 Mach. If the inlet pressure exceeds twice the outlet pressure, the flow will become choked, resulting in sonic exit conditions. Modifying the nozzle geometry alone will not increase the reservoir pressure significantly without transitioning to a convergent-divergent design, which is intended for supersonic flows. Understanding the principles of compressible flow and choked flow is essential for optimizing nozzle performance.
  • #31
Kindly supply some net links that I can download directly.
 
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  • #32
I am unaware of any online resources that are as good as those books.
 
  • #33
At least give me some that can help me to get primary information.
 
  • #34
It used to be that potto.org had some incomplete, free, online textbooks available on these topics. They were okay... not great, but better than random stuff on the internet. It looks like all of their PDFs are missing but you could still browse the HTML versions. I can't guarantee that the texts are complete, and they aren't as good as the resources I already suggested.
 

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