Study on the dynamic characteristics of spray droplet in air environment under inclined condition

Abstract

Theoretical investigations on the dynamic characteristics of spray droplet in air environment subjected to the inclination were performed. The inclined angle ranged from 0° to 30°, and the droplet diameter, initial velocity and injection angle ranged from 0.1 mm to 2 mm, from 1 m/s to 10 m/s and from 15° to 75°, respectively. The results show that the larger droplet initial velocity, diameter and injection angle led to the slower decreasing rate of lateral velocity, the longer lateral distance, and the larger coverage area caused by spray droplet. The larger droplet diameter and initial velocity induce the higher growth rate of vertical distance. The greater difference of droplet diameter and initial velocity result in the shorter chasing time and chasing distance. Increasing the inclined angle will result in the decrease of coverage area and the reduction of the impact of inclined angle on it. In addition, the influence of inclined condition on droplet trajectory heightens with the increase of droplet diameter. For different droplet diameters, the influence of inclined angle on the droplet trajectory located in the same direction with inclination is greater than that of the opposite direction. While the inclined angle has a similar influence on the variation tendency of droplet trajectory located in the same and opposite direction with inclination. Impact mechanism analysis concerns droplet trajectory under inclination are conducted to explain the dynamic characteristics of spray droplet.