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

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SUMMARY

The discussion centers on the feasibility of achieving high inlet pressure (P) in a convergent nozzle while maintaining subsonic exit velocity for air. The critical pressure ratio for air is established as 0.528, indicating that the maximum inlet pressure should not exceed approximately 1.89 times the outlet pressure to avoid choking. Bernoulli's equation is referenced, but its applicability is limited due to the compressibility of air at velocities above 0.3 Mach. The conversation concludes that while nozzle geometry can influence mass flow rate, it cannot increase pressure significantly without transitioning to a convergent-divergent design.

PREREQUISITES
  • Understanding of Bernoulli's equation and its limitations for compressible fluids.
  • Familiarity with the concept of critical pressure ratio in fluid dynamics.
  • Knowledge of Mach number and its implications in nozzle design.
  • Basic principles of compressible flow and thermodynamics.
NEXT STEPS
  • Study the implications of the critical pressure ratio in compressible flow applications.
  • Learn about convergent-divergent nozzle designs and their effects on pressure and flow velocity.
  • Explore advanced topics in fluid dynamics, particularly compressible flow and choked flow phenomena.
  • Review Bernoulli's equation in the context of compressible fluids and its practical applications.
USEFUL FOR

Aerospace engineers, mechanical engineers, and students studying fluid dynamics or aerodynamics who are interested in nozzle design and performance optimization.

  • #31
Kindly supply some net links that I can download directly.
 
Engineering news on Phys.org
  • #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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