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Varying the Intake Valve closing (IVC) in CONVERGE

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Old   July 18, 2021, 18:43
Default Varying the Intake Valve closing (IVC) in CONVERGE
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Hi everyone.

My name is Syaqir and I'm a final year engineering student from UNSW Sydney. Currently doing a study on how implementing the Miller Cycle along with the addition of superchargers/turbochargers can affect the combustion and NOx emissions of a diesel-hydrogen compression ignition engine.

The relevant base valve timing is included in this thread as an attachment for everyone's reference.

My question is:
1) How do I change the Intake Valve profile so that the IVO stays the same while I retard the IVC? Do I manually insert the values myself or is there another way to do that? If I have to manually do it, I only have access to the following data: IVO ca, maximum lift and IVC ca. How do I generate the other lift values in between the data to generate the bell-shaped curve as shown in the attachments?

2) From what I can recall, some intake charge will be pushed back out of the cylinder resulting in loss of pressure when implementing the Miller Cycle and from review, a possible solution would be to utilise turbochargers/superchargers. These if I'm not mistaken means that I need to increase the pressure to simulate the turbochargers/superchargers. Which pressure exactly do I have to increase? I have a strong feeling that it's the intake/inflow pressure but wouldn't hurt to ask the forum for confirmation

Hope to hear from anyone soon. It would really help me for this study. Thanks in advance everyone!

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Old   July 19, 2021, 02:42
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do you have a GT-Power model to generate required input like this?
There you could modify the valve lift and get new intake port pressures as well.

If not, i would modify the valve lift in excel. You could then do a coarse simulation (gridscale set to -2) to estimate the trapped mass and increase intake pressure according to procentual change.
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Old   July 20, 2021, 03:03
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Thank you Tobias so much for your answer and suggestion in approaching this. I will give it a try and see what the results are like.
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