Abstract: In order to study the effect of eccentric impact of jet on the impinging atomization of gel propellant, a relative experimental system is established, and a gel propellant as well as a simulant are prepared. Jet behavior, impinging liquid sheet and droplet size distribution at different eccentricities are measured. Spray incline angle is deduced theoretically and compared to the experimental results under eccentric impingement. The results indicate that the disturbances on jets are strengthened with increase in jet velocity. However, the deformations of the jets near injectors are all very small at different jet velocities since the disturbance is limited. The development and breakup of liquid sheet are basically the same under different eccentricities. While the eccentricity exceeds 1.5/6, two darker regions with a certain angle appear at the impinging point, resulting in the enhancement of flux nonsymmetry. As the eccentricity is improved, the spray incline angle enlarges and is less than the theoretical result. The eccentricity has a little influence on the droplet size distribution of impinging atomization, but Sauter mean diameter (SMD) with eccentricity is always lower than that without eccentricity. And SMD reaches the smallest when the eccentricity equals to 0.5/6.

Key words: ordnance science and technology, gel propellant, impinging atomization, eccentricity, sheet, droplet size