Jet medium and environment medium are thoroughly mixed. The computational area and boundary conditions were as shown in Figure 3. The pressure of powder gases expels the bullet, and it continues along a predictable trajectory. Its configuration optimization design is processed in two stages. At the first step of optimization, nozzle R 90 Figure 8 d was chosen for subsequent experimentation. To better understand the principles at work in this study, let us consider the firing of a bullet. The relevant advantages and feasibility of adding a helix to the nozzle at the outlet were confirmed by applying rifle theory.
Considering shearing action will function in cleaning process, we have made a contribution to increasing axial and radial velocity by optimizing nozzle configuration. In future study, it is necessary to comprehensively analyze the quantity and basic parameters of a spiral line and its corresponding jetting divergency phenomenon in air, considering factors of cavitation and gravity. According to the different nozzle structures first attempted, these nozzles were successively simulated. Figure 1 details their respective structures. These nozzles were then simulated in order to select the one with the best jetting performance. Certain concrete values must be used to analyze our flow model, among which A 1 is inlet cross section area and A 2 is outlet cross section area, defined as follows:
A channel flow will become turbulent if the critical Reynolds number is above Compared to the Stepped nozzle in Figure 7all CC nozzles and TC nozzles demonstrate better jetting performance in the range of effective target distance. Nozzle structure design models with better performance were chosen to make further optimization.
Outside of this region is the droplet flow region, the radial width of which varies as follows: The term q 0 is a theoretical value of volume flux. Nurick studied the cavitation characteristics of sharp-edged orifices allha circular orifices and rectangular orifices and their effect on spray mixing [ 1 ].
To this effect, the CC nozzle was chosen as the study object in this paper. These nozzles were then simulated in order to select the one with the best jetting performance. Estimation in nozzle cleaning performance is of paramount importance in high axial velocity and radial velocity.
The process of exchanging momentum and mass of jet medium and environment medium is the same alha the process of diffusing jet fluid. Hashish and du Plessis developed a theory based on a control volume analysis, which presented a basic method for building cutting equations to evaluate hydrodynamic forces [ 2 ]. Over the past 40 years, a recognizable characteristic pattern has emerged. However, the jet issuing from a helix nozzle actually avoids this problem. Velocity gradients, either horizontal or vertical, do not exist inside of the potential core.
This study, which seeries on nozzle configuration, posits a new nozzle and verifies its highly effective jet velocity by numerical simulation.
Figure 11 shows that jetting velocity magnitude along Y and Z coordinates is not symmetrical, indicating that the high speed jet performs a shearing action on the cleaning object. Its configuration optimization design is processed in two stages. Figure 8 aopha the preliminary optimization structures, in which a is CC nozzle and b — f are optimized nozzles with different radii of circular arcs. Certain concrete values must be used to analyze our flow model, among which A 1 is inlet cross section area and A 2 is outlet cross section area, defined as follows: Considering shearing action will function in cleaning process, we have made a contribution to increasing axial and radial velocity by optimizing nozzle configuration.
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Re is defined as the ratio of the inertia force over the friction force: In the process of material surface cleaning by high pressure water jet, the enhancement of cleaning effectiveness and reduction of energy consumption have been significant areas of research for quite some time.
The jet mainly loses cohesion. The transport equations are as follows: A clear relationship between parameters standoff distance and installation angle and cleaning results was drawn by Gao and Chen [ 4 ]. One important use of the Reynolds number Re obtained by v 1regarded an essential nondimensional parameter that describes the flow characteristics, is to indicate whether the flow is turbulent or laminar.
For the sequential optimization, a 3D model is used to simulate the helix nozzle outlet structure.
Figure 1 details their respective structures. Considering friction loss, more accurate volume flux q is obtained from q 0 multiplying by a friction coefficient set to 1. Table 2 shows optimization procedures of nozzle structure design models. The flow velocity at the inlet and outlet could be preliminarily roughly calculated based on the Bernoulli equation: A tight spiral trajectory ensures high velocity and straight, forward shooting direction.
In future study, it is necessary to comprehensively aloha the quantity and basic parameters of a spiral 1400te and its corresponding jetting divergency phenomenon in air, considering factors of cavitation and gravity. The computational area and boundary conditions were as shown in Figure 3.
Observing the velocity vectors as shown in Figure 10flow velocity magnitude apparently increases along the spiral line, appha horizontal velocity almost matches the axial velocity of the same cross section. The inlet boundary condition was a pressure inlet, and the outlet boundary condition was a pressure outlet. Water-liquid, the subject of flow in axisymmetric space, was the uncompressed ideal fluid and followed a steady flow pattern.
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The nozzle structure determines 11400re water jet velocity, which also alphq the cleaning process. Our case is a constant property fluid flow, indicating that flow density is constant and body force in the equation can be neglected. Figure 4 shows the main nozzle structural parameters. The equation for counting volume flux in the pipeline is then deduced: Two-dimensional simulation of the jet formation of the CC nozzle, TC nozzle, and Stepped nozzle was performed first.
Yanaida and Ohashi first detailed a geometrical description of the water jet in [ 5 ].