PDF table calculation yield unrealistic results (non-premixed combustion)

- March 17, 2021 at 8:53 am
  
  BVH
  Subscriber
  
  Hello everybody,
  I'm trying to simulate a non-premixed combustion of C2H4 with N2O, but the results of my pdf table seem odd. The combustion takes place in a combustion chamber at around 23 bars with a convergent-divergent nozzle as exhaust.
  Problem 1: When I calculate the pdf table (with parameters hereunder), I get "Warning! Rich Flammability Limit (0.192) is greater than double stochiometric (2 * 0.039)", which is not the correct stochiometric mixture fraction and moreover this value changes when I change the equilibrium operating pressure.
  Problem 2: When I display the pdf table (2D curve, mean temperature) for a constant value of the scaled heat loss/gain, the results close to mixture fraction = 0 are incorrect. I joined an image to show this problem (index 6 for scaled variance). The problem can be better visualised on 3D curves, but it is hard to create a good image of this.
  PDF_table_error.jpg
- March 23, 2021 at 1:06 pm
  
  RK
  Ansys Employee
  
  Hello, nAs Ansys employees, we will not be able to view the attached image. Can you please insert the image instead? Thank you. n
- March 23, 2021 at 1:08 pm
  
  BVH
  Subscriber
  
  sorry, my badn

Viewing 2 reply threads

You must be logged in to reply to this topic.

Ansys Innovation Space

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions