Is 0.5% Efficiency for a Steam Ejector Reasonable?

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SUMMARY

The discussion centers on the efficiency of a steam ejector calculated as a pump, yielding a result of 0.5%. The formula used for this calculation involves mass flow rate and pressure differentials, but one participant suggests that the formula may not be appropriate. A reference to the paper "An investigation of ejector design by analysis and experiment" is provided as a resource for better understanding ejector performance. The conversation highlights the need for accurate pressure and flow ratio measurements to evaluate ejector efficiency effectively.

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  • Understanding of steam ejector mechanics
  • Familiarity with fluid dynamics principles
  • Knowledge of efficiency calculation formulas
  • Access to relevant engineering literature, such as the mentioned paper
NEXT STEPS
  • Review the paper "An investigation of ejector design by analysis and experiment"
  • Study the principles of fluid dynamics related to ejector performance
  • Investigate alternative formulas for calculating ejector efficiency
  • Explore pressure and flow ratio measurements in steam ejector applications
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Engineers, researchers, and students interested in steam ejector design and efficiency analysis will benefit from this discussion.

ADunn
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Efficiency of Ejector "as pump"

I was asked to find the efficiency of a steam ejector experiment "as a pump". So I tried the formula :

[(m(P/density + V^2/2))discharge - (m(P/density + V^2/2))suction]/
(m(P/density + V^2/2))steam inlet.

I am getting an efficiency of 0.5%.

Is this a reasonable result or am I approaching this wrong?

Thanks!
 
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Hi, I am interested in these pumps but I have no idea what kind of pressure/flow ratios they can get. Can you please tell me for what measured values you got for 0.5% efficiency?

Thanks,
cezar
 


I don't think your formula is suitable，you can read the paper 《An investigation of ejector design by analysis and experiment》，which can be down load from http://ejector.getbbs.com/
 
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