The CFX5 NOx model is drastically overpredicting NOx. How can I fix this?
|
It is possible that your NOx model might be tuned to a different fuel. Often, this is done through the adiabatic flame temperature. CFX5 allows the adiabatic flame temperature used by the NOx model to be adjusted, and that this can have a dramatic effect on NOx predictions. To adjust the adiabatic flame temperature, modify the Upper Temperature in the FORWARD REACTION RATE singleton under the Thermal NO reaction (see below) REACTION: Thermal NO PDF . . . END FORWARD REACTION RATE: Lower Temperature = 300 [K] Option = Arrhenius with Temperature PDF Pre Exponential Factor = 1.8E+11 [kmol^-1 m^3 s^-1] * 12.567E+3 [kmol ^0.5 m^-1.5 K^0.5] Temperature Exponent = -0.5 Upper Temperature = 2300 [K] REACTION ACTIVATION: Activation Temperature = 38370 [K] + 31096 [K] Option = Activation Temperature END END COMBUSTION MODEL: Option = Finite Rate Chemistry END END END |
||
|