[seek the truth]

Hi,everybody!

I did a dual fuel injection simulation,the ethanol(c2h5oh) is directly injected into cylinder,and gasoline(ic8h18) is injected into inlet manifold. The combustion model is SAGE.
But the simulated cylinder pressure curve always does not match the experimental results,as shown in the figure below.The maximum pressure point of simulations always lags behind the experimental results by 3-4 crank degrees,and the pressure is always higher than the experimental result after the maximum pressure point.
Is there any way to adjust ?
Thanks!

[jetcheve]

Originally Posted by seek the truth

Hi,everybody!

I did a dual fuel injection simulation,the ethanol(c2h5oh) is directly injected into cylinder,and gasoline(ic8h18) is injected into inlet manifold. The combustion model is SAGE.
But the simulated cylinder pressure curve always does not match the experimental results,as shown in the figure below.The maximum pressure point of simulations always lags behind the experimental results by 3-4 crank degrees,and the pressure is always higher than the experimental result after the maximum pressure point.
Is there any way to adjust ?
Thanks!

Good afternoon!

There are several things that could improve your performance in matching pressure trace data. It could be affected by (among others) initial conditions, boundary conditions, improperly set compression ratio or even issues with your data. I highly recommend you go to our website at convergecfd.com, login and access the advanced training on predicting cylinder pressure. There is quite a bit of helpful information in there to get you started!

Regards,

- John