Initialization problem for a dual-fuel engine (RCCI)

amirh.akhavan · September 5, 2018, 04:41

Hello,
at the beginning of compression stroke (IVC=-143) as the start of my closed cycle modelling process, i know the equivalence ratio, and exact amount of air & fuel. unfortunately because of the relatively high pressure in this point (p=1.98 bar), converge studio enters high amount of air in the cylinder, so we need high amount of fuel to reach the equivalence ratio.
is there any solution for this?

jlemoine · September 6, 2018, 10:10

amirh.akhavan,

In order to get the correct mass in your cylinder after Intake Valve closing (IVC) you need to ensure that the compression curve is correct. Having the correct compression curve means that the pressure is correct but also the temperature which will lead to the correct trapped mass in the cylinder at IVC. Depending on what time of the engine cycle you start your simulation at, I would check the inflow boundary condition or the initial condition.

September 5, 2018, 04:41	Initialization problem for a dual-fuel engine (RCCI)	#1
amirh.akhavan New Member amirhossein Join Date: Aug 2018 Posts: 1 Rep Power: 0	Hello, at the beginning of compression stroke (IVC=-143) as the start of my closed cycle modelling process, i know the equivalence ratio, and exact amount of air & fuel. unfortunately because of the relatively high pressure in this point (p=1.98 bar), converge studio enters high amount of air in the cylinder, so we need high amount of fuel to reach the equivalence ratio. is there any solution for this?

September 6, 2018, 10:10		#2
jlemoine Member Jerome Le Moine Join Date: Jan 2016 Location: Convergent Science, Madison WI Posts: 50 Rep Power: 10	amirh.akhavan, In order to get the correct mass in your cylinder after Intake Valve closing (IVC) you need to ensure that the compression curve is correct. Having the correct compression curve means that the pressure is correct but also the temperature which will lead to the correct trapped mass in the cylinder at IVC. Depending on what time of the engine cycle you start your simulation at, I would check the inflow boundary condition or the initial condition. __________________ Jerome Le Moine Support/Application Engineer CONVERGECFD

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