直接数値シミュレーションによる化学反応を伴う二次元乱流噴流に関する研究

抄録

Direct numerical simulation (DNS) is performed on a second-order jet with a chemical reaction of the secondary irreversible reaction (A + B → P) in order to investigate the relationship between the chemical reaction field and the turbulence phenomena. Reactive substance A is contained in the jet flow and reactive substance B is contained in the ambient flow. DNS is performed at three different reaction rates and two different initial concentrations of reactive substance A and B. The visualization of concentration indicates the following. The concentration of product P with high reaction rate is larger than the low rate. In the vicinity of the jet nozzle, the product P is found only near the interface between the jet and the ambient flow, but the product P in the downstream area of the jet is widely distributed inside the jet regardless of the different initial concentrations. When the reactant A in the jet is insufficient, the concentration of the product P is large inside the jet, and conversely, when the reactant A in the jet is sufficient, the concentration of product P is large near the interface between the jet and the ambient flow. This tendency is more prominent as the reaction rate constant is higher.