micro-combustor simulation using hydrogen/air

February 11, 2005, 11:48

Hi,

I am modeling combustion in a micro-combustor(2mm). In order to make it run, I injected premixed stoichiometric H2/air mixture @ T=300K. The initial pressure and temperature in the combustor are 1e5Pa and 1400K, respectively. Finite rate chemistry model is used and the forward reaction rate is specified as "Marinov one-step" mechenism(Marinov, Westbrook, and Pitz, 1995). Inlet H2/air mixture velocity is 50m/s and timestep is 1e-7 s. However, the results shows that it doesn't burn. I see H2/air mixture filled in the combustor and temperature is about 800K.

Since the dimension is very small, I do get a warning massage saying that the average Raynolds number is below 100, which is out of the range of the SST turbulence model.

Anybody knows why the combustion is not ignited? Thanks!

February 14, 2005, 03:36

Is the Marinov mechanism predefined in cfx-5 or did you define it by your own?

February 11, 2005, 11:48	micro-combustor simulation using hydrogen/air	#1
Tony Guest Posts: n/a	Hi, I am modeling combustion in a micro-combustor(2mm). In order to make it run, I injected premixed stoichiometric H2/air mixture @ T=300K. The initial pressure and temperature in the combustor are 1e5Pa and 1400K, respectively. Finite rate chemistry model is used and the forward reaction rate is specified as "Marinov one-step" mechenism(Marinov, Westbrook, and Pitz, 1995). Inlet H2/air mixture velocity is 50m/s and timestep is 1e-7 s. However, the results shows that it doesn't burn. I see H2/air mixture filled in the combustor and temperature is about 800K. Since the dimension is very small, I do get a warning massage saying that the average Raynolds number is below 100, which is out of the range of the SST turbulence model. Anybody knows why the combustion is not ignited? Thanks!

February 14, 2005, 03:36	Re: micro-combustor simulation using hydrogen/air	#2
Rob Guest Posts: n/a	Is the Marinov mechanism predefined in cfx-5 or did you define it by your own?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
micro channel heat exchanger design	serpil kaya	Main CFD Forum	6	March 25, 2018 08:34
Macro and Micro pipe flow comparison	Dave	Main CFD Forum	0	December 13, 2007 15:04
Micro Fluid	Richard	Phoenics	6	March 4, 2002 09:46
Get a free or low price CFD or engineering estimate software about micro air vehicle.	QingHua Zeng	Main CFD Forum	3	May 16, 2000 12:04
CFD in micro fluidics?	Ming-Jyh Chern	Main CFD Forum	4	November 22, 1999 18:08