Auto-ignition CH 4/Air flame with scheme GRI12 - Revision history

Vervisch at 08:53, 30 April 2025

2025-04-30T08:53:28Z

Vervisch at 08:31, 30 April 2025

2025-04-30T08:31:14Z

Vervisch at 08:24, 30 April 2025

2025-04-30T08:24:42Z

Vervisch: /* Key parameters */

2025-04-30T07:48:33Z

‎Key parameters

Vervisch: /* Key parameters */

2025-04-30T07:45:12Z

‎Key parameters

Seltz: /* Key parameters */

2019-01-17T10:33:05Z

‎Key parameters

Seltz: /* Compute Trajectories */

2019-01-17T10:31:15Z

‎Compute Trajectories

Seltz: /* Compute Trajectories */

2019-01-17T10:25:21Z

‎Compute Trajectories

Seltz: Created page with "== '''Objectives''' == The AutoIgnition_GRI12 test case shows an example of CH4/Air auto-ignition using the GRI12 mechanism. == '''Key parameters''' == We are at atmospheri..."

2019-01-17T10:22:57Z

Created page with "== '''Objectives''' == The AutoIgnition_GRI12 test case shows an example of CH4/Air auto-ignition using the GRI12 mechanism. == '''Key parameters''' == We are at atmospheri..."

New page

== '''Objectives''' ==

The AutoIgnition_GRI12 test case shows an example of CH4/Air auto-ignition using the GRI12 mechanism.

== '''Key parameters''' ==

We are at atmospheric pressure, and the fuel is injected in its gaseous form (no evaporation model). We are using the stochastic configuration and we follow only one premixed CH4/Air fluid particule for ignition.

Characteristics of the premixed particule (Phi = 1) :
listInlets.push_back(new MultipleInlet(
/*Temperature*/ 1000,
/*Pressure*/ 1E+05,
/*Mass flow rate*/ 0.001,
/*Xk*/ "",
/*Yk*/ "CH4:0.0550661, O2:0.220264, N2:0.72466990",
/*Evaporation model*/ false,
/*Droplet diameter*/ 0.0,
/*Evaporation time*/ 0.0,
/*Liquid density*/ 0.0,
/*Evaporation latent heat*/ 0.0));

Characteristics of the burned gases inlet :
listInlets.push_back(new Characteristics_MultipleInlet(
/*Temperature*/ 1000,
/*Pressure*/ 1E+05,
/*Mass flow rate*/ 0,
/*Xk*/ "",
/*Yk*/ "",
/*Evaporation model*/ false,
/*Droplet diameter*/ 0.0,
/*Evaporation time*/ 0.0,
/*Liquid density*/ 0.0,
/*Evaporation latent heat*/ 0.0));
/*mixing_time*/ 10000,
/*delta_t*/ 1e-05,
/*nbIterations*/ 150000,
/*Useless variable*/ true));

== '''Results''' ==

===Compute Trajectories ===

@@ Line 5: / Line 5: @@
 == '''Key parameters''' ==
-We are at atmospheric pressure, and the fuel is injected in its gaseous form (no evaporation model). We are using the stochastic configuration and we follow only one premixed CH4/Air fluid particule for ignition.
+We are at atmospheric pressure, and the fuel is injected in its gaseous form (no evaporation model). We are using the stochastic configuration and we follow only one premixed CH4/Air fluid particule for ignition. Note that a temperature set below 1400 will greatly lengthen computation time.
@@ Line 11: / Line 11: @@
     listInlets:
    - # Inlet 0: Air
-     Temperature: 1000
+     Temperature: 1500
      Pressure: 1E+05
      MassFlowRate: 0.1

@@ Line 9: / Line 9: @@
 Characteristics of the premixed particule (Phi = 1) :
-    listInlets.push_back(new MultipleInlet(
+    listInlets:
-                /*Temperature*/ 1000,
+  - # Inlet 0: Air
-                /*Pressure*/ 1E+05,
+    Temperature: 1000
-                /*Mass flow rate*/ 0.1,
+    Pressure: 1E+05
-                /*Xk*/ "",
+    MassFlowRate: 0.1
-                /*Yk*/ "CH4:0.0550661, O2:0.220264, N2:0.72466990",
+    # Xk:
-                /*Evaporation model*/ false,
+    Yk: CH4:0.0948597, O2:0.190233, N2:0.714907
-                /*Droplet diameter*/ 0.0,
+    EvaporationModel: false
-                /*Evaporation time*/ 0.0,
+    DropletDiameter: 0.0
-                /*Liquid density*/ 0.0,
+    EvaporationTime: 0.0
-                /*Evaporation latent heat*/ 0.0));
+    LiquidDensity: 0.0
 Characteristics of the burned gases inlet : (This inlet should always be present as it defines the mixing time, the time step and the iteration number.) It is crucial that the mass flow rate of any inlet is always different from 0 even if in this case "BurnedGases" is set to false to not consider this inlet.

← Older revision		Revision as of 10:31, 17 January 2019
Line 42:		Line 42:
	===Compute Trajectories ===		===Compute Trajectories ===

−	[[File:~~autoIgnition_GRI~~.png\|600px\|center]]	+	[[File:AutoIgnition_results.png\|600px\|center]]

← Older revision		Revision as of 10:25, 17 January 2019
Line 41:		Line 41:

	===Compute Trajectories ===		===Compute Trajectories ===
		+
		+	[[File:autoIgnition_GRI.png\|600px\|center]]

@@ Line 21: / Line 21: @@
                  /*Evaporation latent heat*/ 0.0));
-Characteristics of the burned gases inlet : (This inlet should always be present as it defines mixing time, time step and the iteration number. The mass flow rate is put to 0 in order not to consider this inlet.
+Characteristics of the burned gases inlet : (This inlet should always be present as it defines the mixing time, the time step and the iteration number.) The mass flow rate is put to 0 in order not to consider this inlet.
     listInlets.push_back(new Characteristics_MultipleInlet(
                  /*Temperature*/ 1000,