Spark plug

hiren tala · January 17, 2017, 10:28

hello, i am starter in Converge Software learning. and Student in the Univeristy. i am simulationg single cylinder Spark ignition engine. I want to know, weather i can choose coordinates inspite of Spart plug geometry? in my model, their is no spark-plug geometry just a simple closed cylinder head Body in my model. if i design spark plug in 3D modelling, then i can not assemble it directly in converge , i have to replace whole Modell. can i choose just like coordinate or something, so i can give their high energy accordingly perticular crack Timing. so i dont Need spark plug geometry then, is it possible? please let me know how ?

jlemoine · January 19, 2017, 15:00

Spark plugs are modeled with a source of energy, the geometry of the spark plug helps to get a better representation of the flow in that area. The geometry of the spark plug does not need to present in the geometry to model a SI engine. For reference, I will recommend reading the theory manual chapter 19.6 which talks about the energy sources in engine models. In addition, you could download our example cases to see how the source is set up in a real case.

MFGT · January 21, 2017, 09:46

Its actually quite easy to implement the geometry into your case.
If you dont have a spurk plug geometry, take the one from the example case.
a) Open the case and delete all other boundaries, then export surface.dat
b) Go to your case and import this surface.dat
c) Create the boundary and assign these cells to it. Then translate the Sparkplug to the desired postion.
d) Delete cells from your cylinder head boundary and create new ones, either one-by-one (3 vertices) or from open edge to open edge to connect the Spark plug with your head geometry.
e) Check the normals and you´re done

MFGT · January 24, 2017, 04:02

Small addition:

The tutorial cases have wall temperatures of 550K and 600K (electrode).
However, i found information of NGK: https://www.ngk.de/en/technology-in-...rature-window/

So they propably get a lot hotter (mean is 650°C = 923K). The same can be said about the exhaust valves.

hiren tala · February 28, 2017, 06:00

thanks for your answers.... I was busy since a month in University exams, so couldn't thank.

January 17, 2017, 10:28	Spark plug	#1
hiren tala New Member Hiren Tala Join Date: Oct 2016 Posts: 22 Rep Power: 9	hello, i am starter in Converge Software learning. and Student in the Univeristy. i am simulationg single cylinder Spark ignition engine. I want to know, weather i can choose coordinates inspite of Spart plug geometry? in my model, their is no spark-plug geometry just a simple closed cylinder head Body in my model. if i design spark plug in 3D modelling, then i can not assemble it directly in converge , i have to replace whole Modell. can i choose just like coordinate or something, so i can give their high energy accordingly perticular crack Timing. so i dont Need spark plug geometry then, is it possible? please let me know how ?

January 19, 2017, 15:00		#2
jlemoine Member Jerome Le Moine Join Date: Jan 2016 Location: Convergent Science, Madison WI Posts: 50 Rep Power: 10	Spark plugs are modeled with a source of energy, the geometry of the spark plug helps to get a better representation of the flow in that area. The geometry of the spark plug does not need to present in the geometry to model a SI engine. For reference, I will recommend reading the theory manual chapter 19.6 which talks about the energy sources in engine models. In addition, you could download our example cases to see how the source is set up in a real case. __________________ Jerome Le Moine Support/Application Engineer CONVERGECFD

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January 21, 2017, 09:46		#3
MFGT Senior Member Tobias Join Date: May 2016 Location: Germany Posts: 265 Rep Power: 10	Its actually quite easy to implement the geometry into your case. If you dont have a spurk plug geometry, take the one from the example case. a) Open the case and delete all other boundaries, then export surface.dat b) Go to your case and import this surface.dat c) Create the boundary and assign these cells to it. Then translate the Sparkplug to the desired postion. d) Delete cells from your cylinder head boundary and create new ones, either one-by-one (3 vertices) or from open edge to open edge to connect the Spark plug with your head geometry. e) Check the normals and you´re done

January 24, 2017, 04:02		#4
MFGT Senior Member Tobias Join Date: May 2016 Location: Germany Posts: 265 Rep Power: 10	Small addition: The tutorial cases have wall temperatures of 550K and 600K (electrode). However, i found information of NGK: https://www.ngk.de/en/technology-in-...rature-window/ So they propably get a lot hotter (mean is 650°C = 923K). The same can be said about the exhaust valves.

February 28, 2017, 06:00		#5
hiren tala New Member Hiren Tala Join Date: Oct 2016 Posts: 22 Rep Power: 9	thanks for your answers.... I was busy since a month in University exams, so couldn't thank.