Inlet velocity issue in ansys (premixed combustion)

Kenzhia3310 · April 30, 2020, 13:54

Hi, there.
In order to obtain a stable flame shape, the inlet velocity has to be always between laminar burning velocity and blow-off velocity.
But I am not sure the inlet velocity refer to the max or mean velocity in my parabolic diagram?
Can someone explain the theory as well?

vinerm · April 30, 2020, 15:28

Velocity at the inlet is user specified. If you specify a constant value then the profile is a planar (straight line for 2D), i.e., no variation across the boundary. If you want to apply parabolic profile, then you have to apply it using a profile file or UDF. If you are using v19.x or later, you may use expressions as well.

April 30, 2020, 13:54	Inlet velocity issue in ansys (premixed combustion)	#1
Kenzhia3310 New Member Koo How Boon Join Date: Mar 2020 Posts: 13 Rep Power: 6	Hi, there. In order to obtain a stable flame shape, the inlet velocity has to be always between laminar burning velocity and blow-off velocity. But I am not sure the inlet velocity refer to the max or mean velocity in my parabolic diagram? Can someone explain the theory as well?

April 30, 2020, 15:28	Inlet Velocity	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	Velocity at the inlet is user specified. If you specify a constant value then the profile is a planar (straight line for 2D), i.e., no variation across the boundary. If you want to apply parabolic profile, then you have to apply it using a profile file or UDF. If you are using v19.x or later, you may use expressions as well. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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