Numerical investigation on flow and mixing characteristics of powder fuel under strong shear and shock wave interaction

In this investigation, the mixing process of powder fuel transverse jet and supersonic airflow are discussed. The effects of particle size and induced shock wave on flow and mixing characteristics are also analyzed. The Eulerian-Lagrange method is utilized to simulate the gas-solid two-phase supersonic flow field. This numerical method has been verified using experimental data and simulation data from the open literature. The results reveal that the powder fuel transverse jet interacts violently with the supersonic airflow and forms complex shock wave structures in the flow field. The motion and distribution of particles are affected by their size and the interaction of shock wave/particle. The powder fuel composed of small size particles enhances mixing perfor-mance and has less impact on stagnation pressure loss. The existence of induced shock waves leads to part of the particles into the cavity and the stagnation pressure loss is large. With the increase of induced shock wave in-tensity, the mixing performance of the local region is continuously improved. The case with the inclination angle of 30 degrees owns the best effect with improving the mixing efficiency by 28.33%, but the total pressure loss is increased by 33.88%.