Fluids

Fluids

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

    • 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.

    • 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
    • BVH
      Subscriber
      sorry, my badn
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