Abstract
The impinging pressure of a water jet is a key factor in engineering applications, and the jet shape has a great influence on this pressure. In this paper, five different nozzle shapes were designed, and impacting tests were conducted based on a self-designed experimental platform using a PVDF piezoelectric film sensor and a high-speed camera to record the impacting data. Additionally, the computational fluid dynamics (CFD) method was also applied to study the velocity distribution. The results show that the pressure profiles of different water jet shapes impacting onto a solid surface present a consistent pattern, namely, an initial transient and enormous peak pressure and then a longer and smaller stagnation pressure. Although the stagnation pressure in this paper is not sufficiently obvious, the peak pressures of the five water jet shapes are much different from one another. Under the same inlet pressure, the peak pressure of the circular water jet is the largest, and those of the square, triangular, cross-shaped, and elliptical water jets decrease in turn. The flowing regimes captured by the high-speed camera together with the CFD simulation results indicate that the discrepancy in the peak pressure may be a combined action of the liquid velocities and jet head shapes.
Highlights
One of the most important developments in water jet technology is seeking out novel jets
The computational fluid dynamics (CFD) results show that the cross-sections of different water jet shapes change from their original shapes to circular shapes with an increase in the axial distance
The polyvinylidene fluoride (PVDF) testing results show that the central pressures of the different water jet shapes impacting onto the solid surface present a consistent pattern, namely, the initial transient and enormous peak pressure and the longer and smaller stagnation pressure
Summary
One of the most important developments in water jet technology is seeking out novel jets. One of the most important features of noncircular jets is the axis switching phenomenon, in which the jet flow encounters a deformation around the streamwise axis after exiting around the nozzle. These noncircular outlet nozzles are collectively referred to as unconventional nozzles. The impacting pressure of a water jet is the key factor in engineering applications. If we gain their impacting performance can we use these unconventional jets in the engineering applications effectively. The impacting pressures and influence factors of these unconventional jets still are unknown at present
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