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how mixing pressure Pm is calculated in gas ejector model of Matlab

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how mixing pressure Pm is calculated in gas ejector model of Matlab

Answers (1)

Yifeng Tang
Yifeng Tang on 8 Jun 2023
This pm term is EVERYWHERE in the governing equations of the ejector. It's solved for implicitly to keep the system of equations satisfied. It's not "calculated" in a fashion that pm="some expression of other variables".
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Yifeng Tang
Yifeng Tang on 13 Jun 2024 at 1:54
I don't remember seeing a shipping example. But it's not hard to make a simple test harness model. See attached. I just used reservoirs to set the pressures at each port.
The A port is the "primary" where the pressure is very high. The B port is the outlet at a much lower pressure. The S port is known as the secondary, whose pressure can be higher or lower than the B port but still lower than the primary port. The high pressure at the A port will lead to high velocity at the throat, which entrains the flow from the secondary port. I put some mass flow sensors in the model to show the mass flow throught each port.

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