Abstract
A direct numerical simulation (DNS) is applied to a particle-laden turbulent mixing layer with a chemical reaction, and the effects of particles on turbulence and chemical species' diffusion and reaction are investigated. The unreactive particles, whose response time, τ_P, is smaller than the Kolmogorov time scale, τ_K, [τ_P/τ_K=O(10-1)], are uniformly injected into the high-speed side of the mixing layer. Two reactive chemical species are separately introduced through different sides. The results show that although laden particles generally depress the streamwise and transverse turbulent intensities and mean squared value of concentration fluctuation on the central interface in the mixing layer, they begin to enhance them downstream as the particle size decreases provided the inlet particle volume fraction is fixed. Also, since the small-scale turbulence in the coherent vortices, which promotes the chemical reaction, are suppressed by the laden particles in he whole region, chemical product decreases overall.
