Gas System with Vacuum Pump

36 次查看（过去 30 天）
Dan
Dan 2020-9-9
评论： Juan Sagarduy 2020-11-3
I am trying to model a vacuum pump in Simscape. The Volumetric Flow Rate Source (G) is exactly what I need, however, instead of keeping the outlet flow rate constant at e.g. 0.1 m^3/s I need it to keep the inlet flow rate constant. Is there an easy way to achieve this or do I have to code a custom simscape block?
  2 个评论
Andreas
Andreas 2020-9-25
Could you add your model here?
Do you face problems crossing boundaries (pressure)?
Dan
Dan 2020-10-6
Thanks for your comment.
I do not have a model for this as this was just a general question. However, you could just imagine a constant volume chamber connected to a constand flow rate source. I now want a constant volume flow rate at the inlet (chamber facing side) of the flow rate source, which doesn't seem to be achievable without programming a new custom block.
I do not face problems crossing boundaries.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Juan Sagarduy
Juan Sagarduy 2020-11-2
Hi Dan
I believe it is better to use a pressure source than a volumetric flow rate source. In the inlet, you have the chamber where vacuum is created. Then, the diff pressure in the Pressource source shall make gas leave the chamber until absolute pressure is zero.
But Simscape will complain when pressure is below zero. Finding that level just above zero atm is what you need through an adequate value of pressure in the source.
Hope that helps Juan
  2 个评论
Andreas
Andreas 2020-11-3
Hi Juan,
I attached two models.
vacuum_chamber_ps uses a pressure source and won't work the way expected:
vacuum_chamber_cfrs uses a constant flow rate source and empties the chamber till zero (end with exception).
How to do it right?
Juan Sagarduy
Juan Sagarduy 2020-11-3
Hello Andreas
I managed to make the model with a variable pressure source work. However, I need to insert a flow resistance element between pressure source and the vacuum chamber.
With an increasing rate of (0.1/3) bar/s the vacuum is created in 30 seconds.I guess that in reality one shoud then limit the pressure (or compressor speed) once vaccum is created.
Cheers
Juan

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Gas Models 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by