boundary conditions air and fuel inlet quantities

- August 8, 2019 at 1:43 pm
  
  ozankekul
  Subscriber
  
  Hello;
  
  Im modelling a combustion case. i have calculated air fuel ratio by hand and i have found air mass flow rate 0,003268326 kg/s and fuel mass flow rate 0,000537634 kg/s. moreover, i have four air injector with dimension of 70 mm and i have defined one air inlet for all air injectors. moreover, i have six fuel injector with dimension of 42 mm and i have defined one fuel inlet for all injector. When i defined boundary conditions , should i divide total air mass flow rate to four and total fuel mass flow rate to six ? and what should i set hydraulic diameter for both air and fuel inlets.
- August 8, 2019 at 2:15 pm
  
  Rob
  Ansys Employee
  
  You set the flow based on the labelled boundary: in this case you have one setting for all 6 surfaces so use the total mass. Turbulence conditions are based on the size of the openings and not the total area if there are several.
  
  Set the model up, run a few iterations and then use the report tools to convince yourself what Fluent is doing.
- August 8, 2019 at 3:12 pm
  
  ozankekul
  Subscriber
  
  thanks for your support.
  
  Regards.

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