CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CD

Ignition delay

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 12, 2019, 10:13
Unhappy Ignition delay
  #1
New Member
 
Salvo Miccichè
Join Date: Jul 2019
Location: Karlsruhe
Posts: 1
Rep Power: 0
salmicci is on a distinguished road
Good morning everyone,
I am dealing with a methane engine, homogeneous fuel distribution, simulating the ignition and combustion phase (630 deg - 760 deg). Mixture is poor, lambda = 1.5529. I am trying to create a suitable model, so trying pressure and apparent heat release to match with experimental data. My problem is that the pressure (and consequently AHR) raises too late, and reaches low peak values with respect to experimental case.
I think the problem is in the Laminar flame speed.


My questions are:

1. is it correct to use Gülder correlation in case of methane with lambda = 1.5529? Should I change any coefficient of the model? Can the problem be caused by settings in ISSIM ignition model?
2. is there a way to plot laminar flame speed as a function of crank angle in STAR-CD?


My setup:
ECFM-3Z (ISSIM ignition with 0.1 J energy)
CH4 fuel premixed
Adiabatic BC for the electrodes


p.jpg
ahr.jpg


Thank you in advance, Salvo
salmicci is offline   Reply With Quote

Old   October 22, 2019, 16:14
Default
  #2
New Member
 
Join Date: Oct 2019
Posts: 5
Rep Power: 4
alpie is on a distinguished road
Have you in the meantime resolved the issue you describe here?
alpie is offline   Reply With Quote

Reply

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
RCCI model ignition delay Gaurav0990 CONVERGE 3 July 23, 2021 01:50
Combustion Simulation ANSYS Fluent - There is no ignition delay Rudolf Diesel FLUENT 2 October 1, 2018 02:16
Combustion Simulation ANSYS Fluent - There is no ignition delay Rudolf Diesel FLUENT 0 December 14, 2017 07:48
Need ignition delay and reaction rate data ankitraut27 CONVERGE 1 November 7, 2017 16:28
Ignition modeling Julie Polyakh Siemens 0 May 20, 2004 09:05


All times are GMT -4. The time now is 21:05.