How to control pressure gain and mass flow with Fixed Displacement Pump

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Nadir
Nadir 2025-2-27
回答： Nadir 2025-3-6
Hi,
I am currently learning Simscape by building a simple system with pumps and pipelines.
For my system i use a Fixed Displacement Pump with parameters that calculate pressure gain and mass flow with the torque or the angular velocity source. If i understand well the documentation, torque that drive the pump and pressure gain from inlet to outlet can be linked with that equation:
However, mysensors my measurement never match the calculus whatever parametes i decide to set in the pump window .
I kept the pump parameters by default, i apply a 50N*m torque and i measure a ΔP of almost 14MPa whearas with the formula i predicted 2 Mpa
Is the formula wrong ? How do i preddict my pressure gain and my mass flow at the outlet thanks to the parameters of the pump?
Here is my Simscape system
:
Thanks by advance

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回答（3 个）

Nadir
Nadir 2025-3-3
Hi, here is my simlcape model.
Yifeng Tang
Yifeng Tang 2025-3-5
Hi Nadir,
From you model, I measured of 9.2MPa. This is consistent with the formula you showed. I believe when you put in the displacement parameter (D), you were using cm^3/rev or m^3/rev. Convert rev to in radian and you'll calculate 9.215MPa of pressure difference for 50 N*m torque and 0.88 mechanical efficiency.
In short: unit of displacement.
Nadir
Nadir 2025-3-6
Thank you !
Indeed i forgot converting the rev and now it give the good result.

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