The Well-Stirred Combustion Chamber WSCC Model

The Well-Stirred Combustion Chamber (WSCC) Model 

Dimensional WSCC Approach A macroscopic enthalpy balance on the well-stirred combustion chamber is written as 

Here f)FL j = S/C nO(7 ) - Tf) represents radiative heat transfer to the sink (with due allowance for the presence of any refractory surfaces). And the two terms Q Aln = 7i A (7, - Tf) and Qtti = UAR(T, - T ) formulate the convective heat transfer to the sink and through the refractory, respectively. 

Formulation of the left-hand side of Eq. (5-180) requires representative thermodynamic data and information on the combustion stoichiometry. In particular, the former includes the lower heating value of the fuel, the temperature-dependent molal heat capacity of the inlet and outlet streams, and the air preheat temperature T . It proves especially convenient now to introduce the definition of a pseudoadiabatic flame temperature Tt, which is not the true adiabatic flame temperature, but rather is an adiabatic flame temperature based on the average heat capacity of the combustion products over the temperature interval T T 7), The calculation of Tf does not allow for dissociation of chemical species and is a surrogate for the total enthalpy content of the input fuel-air mixture. It also proves to be an especially convenient system reference temperature. Details for the calculation of 7 are illustrated in Example 13. 

In terms of this particular definition of the pseudoadiabatic flame temperature Tf, the total enthalpy change and gas efficiency are given simply as 

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The Well-Stirred Combustion Chamber (WSCC) Model. 5-40... 

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