RPM Effects on CFM & Pressure of a Rotary (Roots) Blower

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SUMMARY

The RPM of a Roots blower directly influences both CFM (Cubic Feet per Minute) and pressure output. As RPM decreases, both CFM and pressure also decrease, confirming the relationship between these variables in positive displacement pumps. Bernoulli's principle does not apply to Roots blowers, as they operate under different principles than those governing fluid dynamics in open systems. Understanding this distinction is crucial for effective blower operation and performance optimization.

PREREQUISITES
  • Understanding of positive displacement pumps
  • Knowledge of CFM and pressure relationships
  • Familiarity with blower operation principles
  • Basic grasp of Bernoulli's principle
NEXT STEPS
  • Research the operational characteristics of Roots blowers
  • Study the relationship between RPM, CFM, and pressure in positive displacement pumps
  • Explore the limitations of Bernoulli's principle in mechanical systems
  • Investigate performance optimization techniques for rotary blowers
USEFUL FOR

Engineers, mechanical technicians, and anyone involved in the design or maintenance of rotary blowers and pneumatic systems will benefit from this discussion.

aravind5995
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Hi,

I would like to know how the RPM of a root blower will affect the CFM and pressure created by the blower. The confusion that I have is this: Generally when RPM is decreased, both the CFM and pressure decreases. But according to Bernoulli's principle, should not one decrease and the other increase?

Pls help.
 
Engineering news on Phys.org
A Roots Blower is a positive displacement pump so CFM multiplied by Pressure will be proportional to RPM.

What has Bernoulli's principle got to do with a positive displacement pump ?
 

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