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How do I calculate the force coming from the centrifugal compressor exhaust?

Engineering Asked by sai teja on August 3, 2021

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Let’s say I have a centrifugal compressor as shown in the figure and I know the following parameters—-1

  1. Thrust
  2. Inlet and outlet pressure
  3. Power required to operate the compressor
  4. Inlet and outlet velocity
  5. Static pressure and pressure
  6. The blade angle

Now I want to know how do I calculate the force exerted by the exhaust coming out?

One Answer

measure the pressure inside the discharge diffuser with a miniature pitot tube, and the ambient air pressure. the difference will be (delta p). Now measure the area of the discharge diffuser outlet.

the reaction force generated when the blower is running will be approximately

(delta p) x (outlet area).

You could also simply instrument the blower with a force gauge that measures the reaction from the exhaust flow. This has several advantages, as follows:

First, it gives you the actual answer you seek. Second, if you modeled the thrust-generation process mathematically and used that model to predict the behavior of the system, due diligence would require you to verify the correctness of that model by measuring the thrust reaction force in real life. This means you'll be doing this experiment in the future, regardless of the form your model takes.

Answered by niels nielsen on August 3, 2021

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