Abstract
To study the influencing factors of liquid droplets on the cleaning effects of the scale layer, a three-dimensional droplet-impacting-a-blade model is constructed. The finite volume method and the volume of fluid method are used to numerically study the dynamic characteristics of a droplet impacting the fouling layer of a blade. The results show that under certain conditions, increased velocity and diameter of the droplet lead to an increase in the impact force of the droplet, and the greater the curvature of the blade surface, the smaller the vertical impact force of the droplet; likewise, the greater the impact force on cutting, the larger the corresponding spreading coefficient. The impact of liquid on the surface of the blade reduces the peak value of the droplet impact force. Finally, the increase in droplet diameter and velocity will improve the cleaning effect of the jet droplet. The larger the blade surface curvature, the wider the droplet cleaning area will be.
Highlights
The principle of droplet impact descaling refers to the fact that under the continuous impact of cleaning droplets, the front end of an initial crack inside a blade produces a stress concentration area, which leads to a continuous expansion of the pore space on the fouling layer and the blade
The maximum impact force of 0.018 N appears at t = 0.7 ms and for the droplet diameter of 0.6 mm
From the above-mentioned analysis, it can be seen that the amplitude and duration of the impact force of the droplet on the blade are affected to varying degrees by the impact velocity and scitation.org/journal/adv that as the collision speed increases, the peak value of the dimensionless collision force decreases slightly
Summary
The principle of droplet impact descaling refers to the fact that under the continuous impact of cleaning droplets, the front end of an initial crack inside a blade produces a stress concentration area, which leads to a continuous expansion of the pore space on the fouling layer and the blade. The impact force characteristics of the droplets are important in the fouling cleaning of the blade surface. Studying the impact force characteristics of the droplets is key to cleaning blades using jet droplets. The impact of liquid droplets on solid surfaces is often observed It plays an important role in nature and has a wide range of applications, such as on inclined hydrophobic surfaces with and without environmental dust. This includes the dynamic movement of water droplets, the impact of oil droplets on the surface of an internal combustion engine, and the processing of droplet jet technology, among others. To study the impact effects of jet droplets on blades, this study established a three-dimensional droplet-jet model, solved the droplet impact model with the volume of fluid (VOF) method, analyzed the impact force of droplets of different speeds and diameters on blades with different properties, and provided a theoretical basis for the cleaning effects of jet droplets on engine blades
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