use dpm to simulate diesel spray

lzh1056 · May 19, 2009, 09:36

Hi

I am now using FLUENT to simulate the diesel spray process without combustion in a constant volume. I use the plain orifice atomizer and activate the WAVE breakup model and droplet collision model. I am doublt the results show that the sauter mean diameter is always increasing with the time going on. It seems that the droplets don't breakup but coalesce. I don't know why,could anyone help me? Is the solid cone type injection more suitable for diesel spray? Thnaks.

prasad.ichal · May 20, 2009, 06:26

Hi,

How about the air surrounding the nozzle? Is it swirling? Have you used correct model constants?

Best regards
Prasad

lzh1056 · May 21, 2009, 02:02

Quote:

Originally Posted by prasad.ichal

Hi,

How about the air surrounding the nozzle? Is it swirling? Have you used correct model constants?

Best regards
Prasad

Hi,Prasad
The fuel is injected to quiescent air so there is no swirl.
I also try to change the value of B1 from 1.73 to 60 in the
WAVE model. However the sauter mean diameter increase with
time going on at each value of B1. I am now confused.

Best regards

prasad.ichal · May 28, 2009, 07:32

You will have to set sheet constant and ligament constant in the injection. I believe only some experimental data can lead you to arrive at the combination of constants.

raza005421 · June 9, 2018, 12:01

i am doing same problem.
i am confused about vof .
what phase will be given at inlet by using vof and what whats material for injection particles in dpm .
raza05421@gmail.com
plz contact to me if you have done dear
thanks

May 19, 2009, 09:36	use dpm to simulate diesel spray	#1
lzh1056 New Member Simon Liu Join Date: Apr 2009 Posts: 2 Rep Power: 0	Hi I am now using FLUENT to simulate the diesel spray process without combustion in a constant volume. I use the plain orifice atomizer and activate the WAVE breakup model and droplet collision model. I am doublt the results show that the sauter mean diameter is always increasing with the time going on. It seems that the droplets don't breakup but coalesce. I don't know why,could anyone help me? Is the solid cone type injection more suitable for diesel spray? Thnaks.

June 9, 2018, 12:01	dear	#5
raza005421 New Member Mohsin Raza Join Date: Apr 2018 Posts: 2 Rep Power: 0	i am doing same problem. i am confused about vof . what phase will be given at inlet by using vof and what whats material for injection particles in dpm . raza05421@gmail.com plz contact to me if you have done dear thanks

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May 20, 2009, 06:26		#2
prasad.ichal New Member Prasad Dudhgaonkar Join Date: Mar 2009 Location: Chennai Posts: 9 Rep Power: 17	Hi, How about the air surrounding the nozzle? Is it swirling? Have you used correct model constants? Best regards Prasad

May 28, 2009, 07:32		#4
prasad.ichal New Member Prasad Dudhgaonkar Join Date: Mar 2009 Location: Chennai Posts: 9 Rep Power: 17	You will have to set sheet constant and ligament constant in the injection. I believe only some experimental data can lead you to arrive at the combination of constants.