Valveless Pulsejet

andreia_melo · July 31, 2018, 12:15

Hello I'm trying to simulate a valveless pulsejet using ansys fluent. My model is an advanced focussed wave type. I am using transient model, energy equation on, for the viscosityK-epsilon SST model , radiation: P1 and for the species partially premixed combustion . For BCs I have only one pressure inlet (here is a big part of my doubt) with gauss pressure 0 and mean mixture fraction 0.064 (I'm using a stoichiometric propane-air mixture). For the outlet I have pressure outlet also with gauss pressure 0 and progress variable 1. The walls are defined as convective.

My problem is that when I start running I can not get combustion, the fuel does not flow into the combustion chamber. What should I do?

LuckyTran · August 7, 2018, 15:42

Does it make sense for the inlet and outlet to be at the same pressure for this problem? What drives the flow?

andreia_melo · August 8, 2018, 10:51

Yes you right, i've change the inlet pressure to 10.

July 31, 2018, 12:15	Valveless Pulsejet	#1
andreia_melo New Member Andreia Join Date: Jun 2018 Posts: 13 Rep Power: 7	Hello I'm trying to simulate a valveless pulsejet using ansys fluent. My model is an advanced focussed wave type. I am using transient model, energy equation on, for the viscosityK-epsilon SST model , radiation: P1 and for the species partially premixed combustion . For BCs I have only one pressure inlet (here is a big part of my doubt) with gauss pressure 0 and mean mixture fraction 0.064 (I'm using a stoichiometric propane-air mixture). For the outlet I have pressure outlet also with gauss pressure 0 and progress variable 1. The walls are defined as convective. My problem is that when I start running I can not get combustion, the fuel does not flow into the combustion chamber. What should I do?

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August 7, 2018, 15:42		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	Does it make sense for the inlet and outlet to be at the same pressure for this problem? What drives the flow?

August 8, 2018, 10:51		#3
andreia_melo New Member Andreia Join Date: Jun 2018 Posts: 13 Rep Power: 7	Yes you right, i've change the inlet pressure to 10.