ABSTRACT
It is easy to imagine how difficult it is to calculate even the distribution of one variable, such as temperature, or concentration in a furnace, with so much taking place there. Combustion usually proceeds in the recirculating turbulent flow sometimes associated with a swirling motion. To calculate the performance of the furnace, we must solve a group of partial differential equations governing the balance of mass, momentum, energy, and species together with submodels, such as a turbulence model, phase-interaction model, heat-transfer model, and so on. Regarding turbulence modeling, direct numerical simulation (DNS) of turbulent flows is carried out in the scientific field, and it is unrealistic to apply it to engineering simulation of practical systems with large, three-dimensional geometry. So, presently the use of
k-
ε
model is a prerequisite for the practical engineering calculation of furnaces. This is because examples and experience of the
k-
ε
model have been demonstrated in the past more than any others. Thus, this discussion is limited to combustion and heat-transfer models specific to HiTAC. The other models used for simulation show almost no difference between HiTAC and ordinary combustion.
