gas jet penetration

shahrbanoo · June 8, 2014, 08:01

Hi all
I simulated SIDI engine with gas injection. but the gas penetration in my simulation is zero. I've searched and understood that gas penetration is related to nozzle pressure difference, gas density, nozzle hole diameter and ga temperature. but I don't know what is the problem

. because as I know there is nowhere to define injection pressure.
please help me...
thank u...

cfdvenkatesh · June 24, 2014, 20:13

How are you modeling gas injection?

You can create separate boundary and specify inlet with fuel fraction of 1.

shahrbanoo · June 26, 2014, 12:49

dear cfdvenkatesh

I'm using pure gas jet submodel. I didn't understand what u said. could u please explain more? actually I think AVL fire can't see the gas fuel penetration. but if you a way for that, I would be happy to hear from u.
thanks...

cfdvenkatesh · June 26, 2014, 16:58

Hi,
May be I have not understood you problem correctly. I thought are trying to simulate direct inject of gaseous fuel ( H2 / CH4)?

You can send me more detail information to my e-mail id mailforvenkat@yahoo.com

cfdvenkatesh · June 26, 2014, 17:06

I guess, the pure gas jet model immediately evaporates the droplet to gaseous species. May be it is not transferring the momentum.

June 8, 2014, 08:01	gas jet penetration	#1
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 13	Hi all I simulated SIDI engine with gas injection. but the gas penetration in my simulation is zero. I've searched and understood that gas penetration is related to nozzle pressure difference, gas density, nozzle hole diameter and ga temperature. but I don't know what is the problem . because as I know there is nowhere to define injection pressure. please help me... thank u...

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June 24, 2014, 20:13		#2
cfdvenkatesh New Member Venkatesh V Join Date: Sep 2009 Posts: 24 Rep Power: 17	How are you modeling gas injection? You can create separate boundary and specify inlet with fuel fraction of 1.

June 26, 2014, 12:49		#3
shahrbanoo Member shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 13	dear cfdvenkatesh I'm using pure gas jet submodel. I didn't understand what u said. could u please explain more? actually I think AVL fire can't see the gas fuel penetration. but if you a way for that, I would be happy to hear from u. thanks...

June 26, 2014, 16:58		#4
cfdvenkatesh New Member Venkatesh V Join Date: Sep 2009 Posts: 24 Rep Power: 17	Hi, May be I have not understood you problem correctly. I thought are trying to simulate direct inject of gaseous fuel ( H2 / CH4)? You can send me more detail information to my e-mail id mailforvenkat@yahoo.com

June 26, 2014, 17:06		#5
cfdvenkatesh New Member Venkatesh V Join Date: Sep 2009 Posts: 24 Rep Power: 17	I guess, the pure gas jet model immediately evaporates the droplet to gaseous species. May be it is not transferring the momentum.