Influence of structural parameters of descaling nozzle on jet behavior

Abstract

Compared to alternative descaling methods, the high-pressure water descaling technology offers cheaper costs and higher descaling rate, which has obvious advantages. As a key component, the descaling nozzle will have a direct impact on the descaling effect. Based on the detailed study of the traditional U-shaped and V-shaped grooving methods, this paper discovered a conical curve grooving method where the grooving curve shape factor lies between those of the two aforementioned methods, and established a full-scale model of the descaling nozzle. For the conical groove nozzle, numerical Computational Fluid Dynamics (CFD) simulations were performed using the shape factor of the groove curve between 0 and 1 and the throat diameter between 2.1 and 2.4 mm. It has been determined that a descaling nozzle with the shape factor between 0.75 and 0.9 has superior dynamic performance, and that when the throat diameter is between 2.3 and 2.4 mm, the nozzle has a higher outlet average velocity and a reasonable outlet flow rate. In conclusion, the dimensionless functional relationship between taper shape factor, throat diameter, nozzle outlet average velocity, effective descaling width and area is established in order to provide certain theoretical support for various production requirements of nozzles.