Comparison of conditional scalar dissipation rate models on simulation of pilot stabilized methanol flame

The paper presents Large Eddy Simulation (LES) Conditional Moment Closure (CMC) simulation of pilot stabilized methanol flame to study the effects of Conditional Scalar Dissipation Rate (CSDR). Two models are used in this research to evaluate CSDR: Conditional Volume Averaging (CVA) and Amplitude Mapping Closure (AMC). For the turbulence modelling, the dynamic Smagorinsky approach was adopted to allow for local adjustment of Smagorinsky constant. For turbulent combustion modelling, CMC is used. Conditional volume averaging is adopted for calculation of conditional velocity. The temperature, mixture fraction, and major species mass fraction are compared against experimental data along radial direction for both cases. The comparison showed reasonable agreement with the experimental measurements for the temperature. It is also observed that the AMC model is superior in predictions compared to CVA method. Additionally, carbon monoxide and carbon dioxide are predicted with remarkable accuracy. Moreover, the conditional temperature also is in good agreement with experimental data that shows CMC model capabilities in turbulent combustion modelling.

کلیدواژه ها:

Turbulent combustion modeling ، Amplitude mapping closure ، Conditional volume averaging ، dynamic model ، Pollution emission