[Pham Van Chien]

Dear Experts,

I am trying to simulate the combustion of a mixture of CH4 + H2 inside the combustion chamber of a 2-stroke engine. In order to simulate this problem, I am using Species Transport Model. After I calculate a PDF table, I got a pdf-mixture as a mixture, and this mixture is visible in the Materials.

Then, I want to spray this mixture to the combustion chamber where chemical reactions will occur. In Inlet Condition, I am using only Mass Flow Inlet of 0.0008 kg/s, with an Initial Gauge Pressure of 180 bar to inject the fuel into the combustion chamber where has been compressed to 120 bar pressure. But, as you know, the atomization of injected fuel during injecting the fuel is very important in combustion, so I am afraid that with that inlet condition is not enough to make a good fuel spraying injection.

In order to atomize the fuel injection, I am planning to use DPM in conjunction with Species Transport Model, but I have NO any experience in using PDM. So I am writing this Thread to ask if anyone can help me. Your kindly help will be very useful for my project.

My confusing is, in the Set Injection Properties dialog box, for spraying the mixture (CH4 + H2), I chose Surface for Injection Type; chose Multicomponent for Particle Type, and under Material tab, I selected particle-mixture-template, but under Components tab (to input Multicomponent Settings) there is only h20<l> is available with a Mass Fraction of 1 in Component drop-down box. This seems means that with all of my settings in DPM, I am just spraying only h2o<l> into the combustion chamber, instead of the (CH4 + H2) mixture as I desired. This my thinking is right or wrong? Could anyone give some knowledge about this?

In addition, is my chosen model and other settings correct or not? If it is not correct, pls give me some advice. Every your advice will help me to understand this problem better and will be very helpful for me.

Looking forward to receiving your kindly reply.

Thanks in advance!
PV. Chien