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Compressor - Regulator - Plenum - Exit. Regulator problem

  1. Nov 28, 2014 #1

    I have a workbench test set up which consists of a compressor, followed by a 6bar supply line, followed by a regulator (for bringing the pressure down to 2bar) followed by a plenum chamber that leads to a slot that vents to atmospheric. The slot is approximately the same area as the supply line pipe. There is a pressure tapping in the plenum chamber to measure stagnation conditions. I want a plenum stagnation pressure of 2bar. The flow rate at this pressure is 0.1294kg/s which converts to 3240 l/min given the density of the air at this point. The regulator I have has flow characteristic curves for an input pressure of 7bar but shows an output of 2bar is easily achievable at this flow rate. I understand the input pressure is 6bar in my case however, given the high max flow rate shown by the characteristic curve I believe I should still be able to achieve 2bar output with a 6bar input. The problem: The maximum plenum pressure I am able to achieve is about 1.3bar. If I try and increase the pressure past this nothing happens, it is as if the flow is choked. Given that the regulator should be able to produce 2bar output with a 6bar input at the design flow rate, why would my regulator be unable to produce 2bar plenum conditions? Any help is much appreciated. Any more details required please ask.


  2. jcsd
  3. Dec 3, 2014 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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