Shock Wave Interaction With Droplets Of Liquid Fog Experimental And Theoretical Research

As an part of a project "Investigation on New Protection Techniques and Principle of Dust and Vapor Cloud Industrial Explosion Hazards" supported by NSFC, the interaction between shock waves and liquid like drops and sprays is studied experimentally and numerically.The interaction between shock induced airflow and liquid drops is investigated. Experiments are conducted in a 5 m long, 60X60 mm cross-section shock tube, liquid drops acted by shock wave undergo deformation, breakup and atomization. Based on experiments, the effects of shock velocity and drop diameter on drop breakup time have been discussed.An experimental study of blast waves propagating in liquid sprays is described. It is conducted in a vertical tube with 5.4m long, 0.2m inner diameters. The results of experiments revealed explosion suppression of water sprays. The effects of spray concentration, average diameter of particle and shock velocity on explosion suppression have been discussed.Based on the two-fluid model, the attenuation process of blast waves in sprays is simulated by using the Eulerian-Lagrangian method. The TVD and MacCormack schemes are employed to deal with gas and particle equation respectively. Numerical results indicate that sprays have significant influence on explosion suppression , and that the smaller average diameter of particle and the higher spray concentration is, the more obvious the effect is.