phi-T plot

lunar1984 · October 29, 2013, 15:14

Hi All,

I am currently conducting diesel cycle simulation with STAR-CD 4.16. I am wondering if it is possible to get phi-T plot which can explain the soot and NOx formation. The example of phi-T plot is attached.

Thank you in advance.

lunar1984 · November 7, 2013, 09:37

Does anyone have an idea about it? Still waiting for the solution.

Thanks.

pmrvignesh · May 6, 2014, 09:59

Hi Jason,
In order to plot phi-T, you need to calculate phi. phi= equivalence ratio= Mass.fraction of fuel/Mass.fraction of air(oxidizer).

Your CFD calculations would have yielded the mass fraction of fuel and oxidizer, in all the cells. You can then use those values to calculate phi, and then plot against temperature values.

ok_computer · May 19, 2014, 06:25

Hi,

one thing is also how you calculate Lambda or Phi. This should be calculated so that it is based on the mixture fraction e.g. from

Lambda = (m_fu_st(1-f))/f(m_o2_st+m_n2_st)

where f is mixture fraction and m_fu_st is the stoichiometric fuel mass.

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November 7, 2013, 09:37		#2
lunar1984 New Member Jason Join Date: Sep 2011 Posts: 14 Rep Power: 14	Does anyone have an idea about it? Still waiting for the solution. Thanks.

May 6, 2014, 09:59		#3
pmrvignesh New Member Vignesh Join Date: May 2014 Posts: 2 Rep Power: 0	Hi Jason, In order to plot phi-T, you need to calculate phi. phi= equivalence ratio= Mass.fraction of fuel/Mass.fraction of air(oxidizer). Your CFD calculations would have yielded the mass fraction of fuel and oxidizer, in all the cells. You can then use those values to calculate phi, and then plot against temperature values.

May 19, 2014, 06:25		#4
ok_computer New Member Join Date: Jul 2012 Posts: 5 Rep Power: 13	Hi, one thing is also how you calculate Lambda or Phi. This should be calculated so that it is based on the mixture fraction e.g. from Lambda = (m_fu_st(1-f))/f(m_o2_st+m_n2_st) where f is mixture fraction and m_fu_st is the stoichiometric fuel mass.