Gas-Isothermal Liquid Model is not working

I am designing a propellant feed system for a liquid rocket engine, so this have pressurant tank which is gaseous and than the connection goes to propellant tank through various components and from propellant tank the propellant goes to combustion chamber.

The pressure at pressurant tank is 21MPa and propellant tank pressure is 8.375MPa, combustion chamber pressure is 6.894MPa.

I have set the parameters properly but I am not able to get the flow, initially the model was running properly but when I added Gas-IL Tank it started showing error and I am facing difficulty to resolve that as I don't have the height of liquid in the tank.

Even I think that parameters of pressure reducing valves and check valves are not proper can someone explain me the error and also whether the parameters for check valves and pressure reducing valves are set properly or not. Throughout the system I am trying to get the pressure measurement and flow measurement.

Here I am attaching my model too so that you can see the parameters of each block and help me resolve the error.

Thanks a lot.

Answer 1

[Yifeng Tang]

The model architecture is OK but some parameters need some efforts. I attached a modified model and it seems to run OK.

The main changes were at the tank and the IL check valves. You can do a compare (see below) between the two models and see if the changes make sense to you. You may leave comments under this answer with follow up questions on why I made certain changes.

[Himanshu]

Thank You for your answer.