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May 5, 2019, 07:10 |
Questions about ignition
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#1 |
New Member
陈阳阳
Join Date: May 2019
Location: Shen zhen
Posts: 7
Rep Power: 6 |
When the ignition energy is set to 0.04 J. Why is sometimes the ignition successuly, but sometimes it fails? What is the factor to effect ignition successfully or unsuccessfully?
Thanks |
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May 8, 2019, 12:03 |
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#2 |
Member
Yunliang Wang
Join Date: Dec 2015
Location: Convergent Science, Madison WI
Posts: 58
Rep Power: 10 |
You need to check if the volume for the energy source is has changed. You can check the maximum temperature in the domain to see if it is big enough like 30000K for engines. Turbulence intensity and the velocity around the spark plug also affect the ignition.
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May 8, 2019, 12:07 |
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#3 |
New Member
Join Date: Dec 2015
Posts: 27
Rep Power: 10 |
Hi, this is a default value. Generally, this value should come from the user/experiment. The ignition would depend upon this value, mixture fraction and temperature in the domain. If you do not have a well-defined value available and want to make sure that the fuel ignites, you can use a high value for the energy. There is a cut-off temperature which limits the max temperature, no matter what the energy value is.
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May 9, 2019, 12:20 |
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#4 |
New Member
陈阳阳
Join Date: May 2019
Location: Shen zhen
Posts: 7
Rep Power: 6 |
Thank you, i have understanded it deeply。
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May 9, 2019, 12:23 |
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#5 | |
New Member
陈阳阳
Join Date: May 2019
Location: Shen zhen
Posts: 7
Rep Power: 6 |
Quote:
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October 11, 2019, 05:51 |
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#6 |
New Member
lucas
Join Date: Oct 2019
Posts: 1
Rep Power: 0 |
Check out whether the volume for energy source changes. Also, keep in mind that velocity and turbulence intensity can affect the ignition.
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