CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > AVL FIRE

emission parameters

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree5Likes
  • 2 Post By mfarhad03
  • 1 Post By gafoorcp
  • 2 Post By rajeev50588

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 18, 2014, 02:36
Post emission parameters
  #1
Member
 
ABDUL GAFOOR CP
Join Date: Jul 2014
Posts: 30
Rep Power: 12
gafoorcp is on a distinguished road
hiii.....
In AVL we are getting the emission parameters as mass fractions only....can anybody suggest me the procedures to convert this mass fraction into g/kg of fuel or g/kWh units.....
thanking you
gafoor
gafoorcp is offline   Reply With Quote

Old   November 23, 2014, 17:10
Default
  #2
New Member
 
Farhad Hossain
Join Date: Aug 2014
Posts: 4
Rep Power: 12
mfarhad03 is on a distinguished road
Calculate the total number of moles in the exhaust gas from the volume flow rate(m3/hr) of exhaust gas using the ideal gas law PV=nRT.

Number of moles in the exhaust gas flow, n =RT/PV, where R (R = 8.3145 J/mol·K) isideal gas constant, V is exhaust flow rate in m3/hr, P is pressure in N/m2 and T istemperature in K.

2. Multiply by the ppm value (y*10-6, assume y is measured ppm of gas) for eachspecies of pollutant to get the moles per hour of that species

3. For each pollutant species, multiple by the molar mass (molecular weight) to getgrams per hour. Divide by power output in kW to get grams per kiloWatt-hour

I have also attached a calculation file for your understanding.
Attached Images
File Type: jpg emission.JPG (82.6 KB, 163 views)
openfoam and sajjad400 like this.
mfarhad03 is offline   Reply With Quote

Old   November 24, 2014, 03:35
Default
  #3
Member
 
ABDUL GAFOOR CP
Join Date: Jul 2014
Posts: 30
Rep Power: 12
gafoorcp is on a distinguished road
thanks a lot for your valuable information.....

regards
gafoor
gafoorcp is offline   Reply With Quote

Old   November 24, 2014, 03:59
Default emission parameters
  #4
New Member
 
Farhad Hossain
Join Date: Aug 2014
Posts: 4
Rep Power: 12
mfarhad03 is on a distinguished road
Hi gafoor
Do you help me about AVL Fire Spray and Combustion program?

Best regards
farhad
mfarhad03 is offline   Reply With Quote

Old   November 24, 2014, 04:25
Default
  #5
Member
 
ABDUL GAFOOR CP
Join Date: Jul 2014
Posts: 30
Rep Power: 12
gafoorcp is on a distinguished road
hii...
i am also very new in AVL and also in CFD.
though i will try my level best to help you..
feel free to ask me about your problems and we will discuss....
my mail ID is gafoorcp@yahoo.com

regards
gafoor
Prateek manit likes this.
gafoorcp is offline   Reply With Quote

Old   January 29, 2016, 18:33
Default Are AVL Fire emission results correct ?
  #6
New Member
 
muhammet
Join Date: Jan 2016
Location: istanbul
Posts: 2
Rep Power: 0
muhammet is on a distinguished road
Hi all,

i am using AVL fire but i am doubtful about the results of emissions. i did some simulation and tuned the cylinder pressure with exp. but the emissions did not tuned.

i use extended zeldovich model for NO

and one more; when i use the other model for NO, it gives different resuls at same temperature curve.

could any one help me?

thanks.
muhammet is offline   Reply With Quote

Old   January 29, 2016, 18:46
Default
  #7
New Member
 
muhammet
Join Date: Jan 2016
Location: istanbul
Posts: 2
Rep Power: 0
muhammet is on a distinguished road
i thing you can get total mass curve (or data) and then if you multiply the total mass with mass frac. you will get the mass of i species( for ex. NO ). then you must find the value of mass per hour ( with using the engine speed ). then devide it with power.

TM = total mass* injector hole number (because it gives total mass results for only per hole)
NO mass = NO mass frac.*TM

NO [g/kWh] = {(NO mass)*(n/2)*60} / power

! engine speed must devided by 2 if it 4 strokes
! 60 is represent the minutes in hour.
muhammet is offline   Reply With Quote

Old   April 6, 2016, 00:26
Default
  #8
New Member
 
Join Date: Feb 2013
Posts: 10
Rep Power: 13
rajeev50588 is on a distinguished road
Quote:
Originally Posted by muhammet View Post
i thing you can get total mass curve (or data) and then if you multiply the total mass with mass frac. you will get the mass of i species( for ex. NO ). then you must find the value of mass per hour ( with using the engine speed ). then devide it with power.

TM = total mass* injector hole number (because it gives total mass results for only per hole)
NO mass = NO mass frac.*TM

NO [g/kWh] = {(NO mass)*(n/2)*60} / power

! engine speed must devided by 2 if it 4 strokes
! 60 is represent the minutes in hour.

Paste the following code in a notepad and change the file extension from *.txt to *.frml
(frml is the extension which works as a formula file for AVL FIRE)

Upload this formula and you will get the NOx values in ppm directly

// --- NOx_ppm.frml ---
// Must be used with cell-selection only!
// Computes the average NOx concentration in [ppm] according
// to the specified assumed molar mass of NOx as fl2 result;
// molar mass of NOx in g/mol
#define REAL_assumed_molar_mass_of_NOx 38.0

$$init
double ppm_nox = 0.0;
if(!init){
if(divisor > 0.0) ppm_nox = sum / divisor * 1.0e6;
if(IAMPRO < 2){
print "NOx_ppm.frml: avg NOx concentration in", name, ":", ppm_nox, "[ppm]";
}
sum = ppm_nox;
divisor = 1.0;
}
$$formula
divisor += ap * vol / (8314.4 * temp);
return YNOXMF[index] * den * vol / REAL_assumed_molar_mass_of_NOx;



Once you get the NOx ppm values from above formula use the following:

NOx (gm/hr) = 0.001587 * NOx (ppm) * Exhaust Flow (kg/hr)
and NOx (gm/kWhr) = NOx (gm/hr) / Power (kW)

Since ESE diesel calculates BSFC (gm/kWhr) , Power (kW) and AFR, you can get following

a) Fuel Flow = BSFC (gm/kWhr) * Power (kW) = Fuel Flow (kg/hr)
b) Air Flow (kg/hr) = AFR * Fuel Flow
c) Exhaust Flow (kg/hr) = Air Flow + Fuel Flow

Please note all the above calcluations do not contain the NOx correction factor which is dependant on humidity, ambient temperature etc which of course cannot be determined by AVL FIRE.
Usually the NOx correction factor is 0.94 to 0.95 which will be further multiplied to the above NOx (gm/kWhr) value giving the final answer

This is taken from ISO 8178 emission calculation standard
In this standard the engine power has weightage factors which I have not considered here.. (for simplicity )
Vikiathreya and sajjad400 like this.
rajeev50588 is offline   Reply With Quote

Old   July 6, 2016, 12:23
Default
  #9
Senior Member
 
amin u3fi
Join Date: Feb 2013
Posts: 137
Rep Power: 13
amin_u50 is on a distinguished road
I used this formula but it does not work. could you please send me the .h file?
amin_u50@yahoo.com
amin_u50 is offline   Reply With Quote

Reply

Tags
avl fire, emission, mass fraction

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pro/E to ANSYS Parameterization Guide Trues ANSYS 4 April 18, 2018 05:52
Parameters rhoSimpleFoam marcus85 OpenFOAM Pre-Processing 0 May 15, 2013 09:36
Turbulence model parameters and equations Maximus91 Main CFD Forum 1 October 24, 2012 13:20
Parameters for multigrid solver HaZe OpenFOAM Running, Solving & CFD 3 January 28, 2012 02:05
units of geometrical parameters lost SoobY ANSYS Meshing & Geometry 2 January 10, 2011 03:58


All times are GMT -4. The time now is 23:11.