- #1
GMVitus
Good day folks!
I am working on the simulation of an engine, and in particular the oil system makes my head ache. I already finished the calculations for viscosity and temperature, but now I'm stuck on coming up with formulas for pressure and flow rates. With what should I start?
For simplicity let's say the system consists of the following components:
1. an oil tank or sump
2. an engine-driven oil pump
3. the lines and crevices of the engine
Here's part one of the problem:
I'd say the starting point would be the pump, because it is the pump that sets everything in motion. BUT what does the pump actually do? Is the pump generating a pressure between the inlet and the outlet, which then generates the oil flow? Or is the pump generating a flow which results in a pressure differential?
Part two:
Since the oil is pretty much not compressed in any meaningful way, I assume that the volume of oil that enters the system is the same as the volume of oil pushed out of it, back to the sump/tank. But how do flow and pressure change when the oil is, for example, pressed through a tiny hole? The pressure rises in front of the hole, it decreases behind the hole. But that also means that there's a big pressure build-up right after the pump, right?
I'm very confused about the relationships between all these variables, and even after reading up a lot on fluid dynamics, I'm still in the dark putting everything into practice. I'd love to hear your thoughts, and hope you can point me in the right direction.
Thanks a lot!
Cheers,
Vitus
I am working on the simulation of an engine, and in particular the oil system makes my head ache. I already finished the calculations for viscosity and temperature, but now I'm stuck on coming up with formulas for pressure and flow rates. With what should I start?
For simplicity let's say the system consists of the following components:
1. an oil tank or sump
2. an engine-driven oil pump
3. the lines and crevices of the engine
Here's part one of the problem:
I'd say the starting point would be the pump, because it is the pump that sets everything in motion. BUT what does the pump actually do? Is the pump generating a pressure between the inlet and the outlet, which then generates the oil flow? Or is the pump generating a flow which results in a pressure differential?
Part two:
Since the oil is pretty much not compressed in any meaningful way, I assume that the volume of oil that enters the system is the same as the volume of oil pushed out of it, back to the sump/tank. But how do flow and pressure change when the oil is, for example, pressed through a tiny hole? The pressure rises in front of the hole, it decreases behind the hole. But that also means that there's a big pressure build-up right after the pump, right?
I'm very confused about the relationships between all these variables, and even after reading up a lot on fluid dynamics, I'm still in the dark putting everything into practice. I'd love to hear your thoughts, and hope you can point me in the right direction.
Thanks a lot!
Cheers,
Vitus