Reply To: how to model mass flow rate as input based on pressure difference

[luis.pusey-alvarado]

Thank you Reno for update,

 

We are working on filling a bladder from a pump based on mass flow rate and pressure difference. The pressure difference is calculated as atmospheric pressure minus pump pressure, which we are controlling. The goal is for the pump to automatically adjust to maintain the desired mass flow rate based on this pressure difference. The pump should focus on maintaining mass flow rate through the outlet area rather than time.

 

We tried AIRBAG_INTERACTION_CARD with *AIRBAG_WANG_NEFSKE based on mass flow rate vs pressure difference however we are seeing inconsistencies in results as bladder not fully inflating with mass flow rate with specified parameters. As density and temperature have significant impact on bladder inflation which we don’t want to consider.

The only way to achieve the desired outcome is by modifying the gas temperature from 300 K to 470 K, which does not accurately reflect our scenario of steady-state cooled air.

 

I would appreciate your guidance on how to get the fully inflated bladder with room temperature and second how to maintain constant mass flow in pump cavity based on area not based on time.