Exhaust plume modeling

December 24, 2006, 08:42

Dear Friends,

Any body can tell me, Fluent can be used to get the pressure and temperature distribution in the rocket exhaust plume.

bye with regards sisir

December 28, 2006, 08:16

Sisir, I can't see any reason not to do so If you model your problem properly. Jim

December 28, 2006, 22:42

Thanks Jim Clancy for your response. I am an electrical engineer so I have lots of difficulties and doubts. Still I am trying to do using Fluent. Pls send me ur email id for further contact. My email id: sisir_in@rediffmail.com

bye.... sisir

December 29, 2006, 21:25

ana_jed@yahoo.com

pipin · January 13, 2011, 09:47

Hi,

I wanted to disinterring this post to tell you about my problem.

I'm supposed to calculate the concentration of a species in a jet nozzle.
Literature show me the peak temperature (reburning zone) far beyond the FLUENT calculation and mass fraction of OH for example does not change in the reburning zone ...

Solver is pressure-based, I'm in k-e standard (or realizable) and species transport (12 species and 17 reversibles reactions) with laminar finite rate model.

I like to know if you have some advice to help me see more clearly?!

Thanks

pipin · January 13, 2011, 12:40

i think it's the fault of the unit of the rate coefficient (Arrhenius)
in litterature, i have the activation energy in cal/mol and R in cal/mol.K whereas FLUENT wants E in J/kgmol...

Does anyone would have any idea?

Nikolopoulos · January 22, 2011, 13:22

Ok, you should double check the units!!!
Check the order of the reaction as well!

Are you sure that laminar finite rate applies in your model????

If not try the finite rate/ eddy dissipation model

However, reacting flows are highly difficult problems as far as convergence with experimental data is concerned.
There are more sophisticated models for homogeneous reactions (chemkin tables...) but first check the ordinary ones.

pipin · February 18, 2011, 09:58

Thank you for your answer.
I checked the units and i found several mistakes...
Now the reaction are simulated but no in the same range...
I explain, i've reaction between OH and O, HCL for example and they have to caused a rise of temperature in a specific part of domain... but i'have the maximum of concentration of the OH species but not in temperature...
Which track should i follow in your opinion?
My model : PBNS, standard Ke, Non equilibrium with Viscous heating, and laminar finite rate.

purushothge · December 25, 2011, 09:28

Quote:

Originally Posted by Jim Clancy
;137856

ana_jed@yahoo.com

hi jim , i am also trying to capture the plume of the nozzle flow and with the obtained solutions there is a change in temperature profile.

December 24, 2006, 08:42	Exhaust plume modeling	#1
sisir kumar nayak Guest Posts: n/a	Dear Friends, Any body can tell me, Fluent can be used to get the pressure and temperature distribution in the rocket exhaust plume. bye with regards sisir

December 28, 2006, 08:16	Re: Exhaust plume modeling	#2
Jim Clancy Guest Posts: n/a	Sisir, I can't see any reason not to do so If you model your problem properly. Jim

December 28, 2006, 22:42	Re: Exhaust plume modeling	#3
sisir Guest Posts: n/a	Thanks Jim Clancy for your response. I am an electrical engineer so I have lots of difficulties and doubts. Still I am trying to do using Fluent. Pls send me ur email id for further contact. My email id: sisir_in@rediffmail.com bye.... sisir

December 29, 2006, 21:25	Re: Exhaust plume modeling	#4
Jim Clancy Guest Posts: n/a	ana_jed@yahoo.com

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January 13, 2011, 09:47		#5
pipin New Member pipin Join Date: Apr 2009 Posts: 20 Rep Power: 17	Hi, I wanted to disinterring this post to tell you about my problem. I'm supposed to calculate the concentration of a species in a jet nozzle. Literature show me the peak temperature (reburning zone) far beyond the FLUENT calculation and mass fraction of OH for example does not change in the reburning zone ... Solver is pressure-based, I'm in k-e standard (or realizable) and species transport (12 species and 17 reversibles reactions) with laminar finite rate model. I like to know if you have some advice to help me see more clearly?! Thanks

January 13, 2011, 12:40		#6
pipin New Member pipin Join Date: Apr 2009 Posts: 20 Rep Power: 17	i think it's the fault of the unit of the rate coefficient (Arrhenius) in litterature, i have the activation energy in cal/mol and R in cal/mol.K whereas FLUENT wants E in J/kgmol... Does anyone would have any idea?

January 22, 2011, 13:22		#7
Nikolopoulos Member Nikolopoulos Aristeidis Join Date: Jan 2011 Location: Athens, Greece Posts: 62 Rep Power: 15	Ok, you should double check the units!!! Check the order of the reaction as well! Are you sure that laminar finite rate applies in your model???? If not try the finite rate/ eddy dissipation model However, reacting flows are highly difficult problems as far as convergence with experimental data is concerned. There are more sophisticated models for homogeneous reactions (chemkin tables...) but first check the ordinary ones.

February 18, 2011, 09:58		#8
pipin New Member pipin Join Date: Apr 2009 Posts: 20 Rep Power: 17	Thank you for your answer. I checked the units and i found several mistakes... Now the reaction are simulated but no in the same range... I explain, i've reaction between OH and O, HCL for example and they have to caused a rise of temperature in a specific part of domain... but i'have the maximum of concentration of the OH species but not in temperature... Which track should i follow in your opinion? My model : PBNS, standard Ke, Non equilibrium with Viscous heating, and laminar finite rate.