Test Details

• Chemiluminescence signatures of OH^* and CH^*.


• Determination of marker for equivalence ratio.


• Determination of marker for flame temperature.

OH^*/CH^* correlation with equivalence ratio

• OH^*/CH^* intensity ratio correlates with equivalence ratio.


• OH^*/CH^* intensity ratio follows a linear trend with Φ for 0.75-0.95.


• The correlation is:
    where I_r = OH^*/CH^*.


• This empirical formulation (R² = 0.985) can be used to evaluate Φ from 0.75 to 1.35 when measured data for I_r is available.

CH^* chemiluminescence and flame temperature

• CH^* intensity and temperature variations with equivalence ratio are similar.


• However, CH^* and temperature peaks do not occur at same equivalence ratio.


• Hence, CH^* might not be a good marker for flame temperature.

OH^* chemiluminescence and flame temperature

• OH^* intensity and temperature variations with equivalence ratio are similar.


• Further, OH^* and temperature peaks occur at nearly same equivalence ratio.


• Hence, OH^* is a good marker for flame temperature.

OH^* intensity-flame temperature correlation

 

• OH^* intensity normalized using its peak value and temperature variations are correlated using the following expression (R² = 0.97)

 


• The correlation is based on data obtained for Φ = 0.85-1.35.