High pressure at the end of compression stroke..

Pawan30 · January 2, 2016, 06:55

Hi,
I am simulating the compression stroke of a Diesel Engine in ANSYS ICE workbench.As, the piston move upward in the compression stroke, just before the injection, the pressure calculated by the simulation is more than the actual pressure corresponding to the experimental value.The actual value is about 20bar but, the pressure is calculated about 80bar by the simulation.I am not getting, why the pressure is rising so much in simulation ??
How to solve this problem ??

RHU · January 15, 2016, 01:49

Have you checked the trapped mass inside the cylinder?

Pawan30 · January 15, 2016, 10:34

Hi,RHU
How to check the trapped mass inside the cylinder?
I am starting the simulation from IVC.

RHU · January 16, 2016, 04:27

I havent used Ansys ICE, but try post-processing the mass in cfd-post.
Adjust the initial mass when needed to match the exp. pressure trace. Also check if the compression ratio is correct.

Pawan30 · February 17, 2016, 15:16

Hey, RHU
I have checked the density of air, trapped inside the cylinder.I have given intial value for temp.(340K) and pressure(1.6 Bar) at IVC. At this point when i checked the density it has a value of 1.63 Kg/m3, which is correct according to the value of temp. and pressure. And, Then I calculated the mass, according to the volume at IVC, but how would I check that, this is correct.
Thanku

, And Sorry for replying late..

January 2, 2016, 06:55	High pressure at the end of compression stroke..	#1
Pawan30 New Member Pawan Meena Join Date: Aug 2015 Posts: 5 Rep Power: 10	Hi, I am simulating the compression stroke of a Diesel Engine in ANSYS ICE workbench.As, the piston move upward in the compression stroke, just before the injection, the pressure calculated by the simulation is more than the actual pressure corresponding to the experimental value.The actual value is about 20bar but, the pressure is calculated about 80bar by the simulation.I am not getting, why the pressure is rising so much in simulation ?? How to solve this problem ??

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January 15, 2016, 01:49		#2
RHU New Member Join Date: Jan 2016 Posts: 2 Rep Power: 0	Have you checked the trapped mass inside the cylinder?

January 15, 2016, 10:34		#3
Pawan30 New Member Pawan Meena Join Date: Aug 2015 Posts: 5 Rep Power: 10	Hi,RHU How to check the trapped mass inside the cylinder? I am starting the simulation from IVC.

January 16, 2016, 04:27		#4
RHU New Member Join Date: Jan 2016 Posts: 2 Rep Power: 0	I havent used Ansys ICE, but try post-processing the mass in cfd-post. Adjust the initial mass when needed to match the exp. pressure trace. Also check if the compression ratio is correct.

February 17, 2016, 15:16		#5
Pawan30 New Member Pawan Meena Join Date: Aug 2015 Posts: 5 Rep Power: 10	Hey, RHU I have checked the density of air, trapped inside the cylinder.I have given intial value for temp.(340K) and pressure(1.6 Bar) at IVC. At this point when i checked the density it has a value of 1.63 Kg/m3, which is correct according to the value of temp. and pressure. And, Then I calculated the mass, according to the volume at IVC, but how would I check that, this is correct. Thanku , And Sorry for replying late..