Fluids

Fluids

Modelling of an Axial Piston Pump

    • shrav007
      Subscriber
      I'm trying to simulate an axial piston pump. There is moving and rotating mesh (pistons). I am trying to get the flow and leakage characteristics. I have given pressure inlet and outlet boundary condition. The inlet has a pressure of 4 bar ( the fluid comes from a tank with a pressure of 4 bar ) and the outlet has atmospheric pressure condition. The Mach number is 0.116, so the simulation is incompressible. The inlet pressure does not have supersonic pressure.nAfter running the simulation, I am seeing that the outlet pressure is lesser than the inlet pressure. Shouldn't the outlet pressure be greater than the inlet pressure since the pistons are compressing the fluid ? I need to get an outlet pressure of 110 bar to 120 bar.nWhat is it that I am doing wrong ? n
    • Karthik R
      Administrator
      nApologies for the delayed response. We seem to have missed your post. nDo you have a flow going from inlet to outlet? Also, it seems that you are specifying an inlet pressure of 4 bar and an outlet pressure of 1 atmospheric pressure (~ 1 bar). This is probably the reason why you have a larger inlet pressure compared to the outlet. Again, I'm not 100% sure of your geometry. Based on what I'm reading, the reason why you are seeing a higher inlet pressure compared to the outlet is because of your boundary conditions. nI hope this answers your question.nThank you.nKarthikn
    • shrav007
      Subscriber
      Thanks for your reply. nMy flow is going from inlet to outlet. The images are given below.nDo I have to specify 120 bar at outlet? nI have also given a zip file containing the motion animation of the Axial Piston Pump obtained from result.n
    • Karthik R
      Administrator
      To be honest, it depends on what your end modeling goal is? Are you attempting to model the flow inside this pump to understand the performance? Then, I'd try to use pressure inlet and mass flow outlet boundary condition. nPlease have a look at the following YouTube video which goes into the details of how to set-up such a problem. Yes, the pump is different and the performance would also be different. However, you should be able to borrow a few modeling elements from here for your simulation. nI hope this helps.nThanks.nKarthikn n
    • shrav007
      Subscriber
      Ok Thanks.n
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