Experimental and Numerical Investigation of the Shock Wave Induced by a High-Pressure Diesel Spray

The shock wave phenomenon has been very common in the high-pressure fuel spray. In this paper, the effect of the shock waves on the spray development and the variations of the flow field parameters were investigated using the Schlieren imaging coupled with a numerical simulation. Results showed that the shock wave contributed to the increase in the spray tip penetration. The mixing characteristics of the spray also improved in the shock-wave state. Numerical simulations were used to investigate the flow characteristics of the shock wave and the effect of the shock wave on the flow field parameters. Results showed that the simulated shock wave characteristic parameters were consistent with the experimental data. In addition, the flow field parameters were affected by the shock wave propagation. The maximum density ratio, pressure ratio and temperature ratio after and before the shock wave are 2.46, 2.01 and 1.15, respectively, under the fuel injection pressure of 320MPa.