Pre Defined Spray Combustion

- July 30, 2019 at 1:12 pm
  
  vipinmundro
  Subscriber
  
  I am running a Spray combustion in fluent using DPM with an upstream pressure of 13 bar and downstream pressure 0.6 atm, i want to know whether the pressure build in this analysis is slow or not? After 1000 iterations, am getting pressure distribution with max as 0.8 bar, never reached 13 bar. I need some urgent help on this?
- July 30, 2019 at 1:45 pm
  
  Rob
  Ansys Employee
  
  Why do you expect to see 13 bar in the system? Some images may help, as would an explanation of what you're modelling.
- August 1, 2019 at 10:36 am
  
  vipinmundro
  Subscriber
  
  Fuel is DPM Injected, Oxidiser in vapour form: Chamber pressure is maintained at 13 bar and nozzle is expanded with exit pressure 0.6 atm.
- August 1, 2019 at 11:08 am
  
  Rob
  Ansys Employee
  
  And the flow is 0.6bar when leaving the above domain? Or exhausts into a zone kept at 0.6 bar?
- August 1, 2019 at 12:06 pm
  
  vipinmundro
  Subscriber
  
  flow is leaving at 0.6 bar
- August 1, 2019 at 1:25 pm
  
  Rob
  Ansys Employee
  
  So, the system has a 12.4bar pressure loss?
- August 2, 2019 at 4:52 am
  
  vipinmundro
  Subscriber
  
  yeah!
- August 2, 2019 at 10:48 am
  
  Rob
  Ansys Employee
  
  Check your inlet boundary conditions, but also your assumption on the unit operating conditions: 12.4bar is a huge loss in a system when you have to pressurise fuel & oxidant first.
- August 2, 2019 at 1:23 pm
  
  vipinmundro
  Subscriber
  
  yea i am injecting fuel & oxidizer at this pressures
- August 2, 2019 at 2:25 pm
  
  Rob
  Ansys Employee
  
  How stable is it?

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