Research on Flow Field Characteristics in Water Jet Nozzle and Surface Damage Caused by Target Impact
Abstract
:1. Introduction
2. Theoretical Model and Calculation Method
2.1. Geometry and Meshing
2.2. Boundary Conditions and Parameter Settings
3. Results and Analysis of Numerical Calculation
3.1. Analysis of Flow Field Calculation Results
3.2. Numerical Simulation Analysis of Matrix Damage
4. Experimental Analysis
4.1. Experimental Design
4.2. Analysis of Experimental Results
5. Conclusions
- (1)
- The water jet is divided into three regions along the axial direction: the cavitation jet in the nozzle, the free jet, and the stagnation zone. It is divided into a core area and an atomization area along the radial direction. The distribution of turbulent kinetic energy in the atomization area can be used as the basis for judging the degree of jet diffusion and the rate of energy decay. The peak point of turbulent kinetic energy can be used as the boundary between the inner and outer jets.
- (2)
- After the water jet impactes the surface of the target, a crater-like crater is formed. With the increase of impact pressure, the overall deformation showes an increasing trend. And the increasing trend is obviously rising. Without considering the accumulated damage, the jet pressure is the most important factor.
- (3)
- The depression of the erosion area is caused by the destruction of the material by the stagnation pressure. Accumulated damage has a serious impact on the surface erosion damage of the target.
Author Contributions
Funding
Conflicts of Interest
References
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Test Group | Number of Grid Cells | Maximum Pressure of the Impacted Surface of the Target (MPa) |
---|---|---|
A1 | 324,651 | 59.439 |
A2 | 632,218 | 71.965 |
A3 | 975,376 | 79.731 |
A4 | 1,262,945 | 82.686 |
A5 | 1,794,662 | 83.127 |
A6 | 2,036,387 | 83.238 |
A7 | 2,560,398 | 83.367 |
Broken Mode | Jet Characteristics |
---|---|
Rayleigh broken | liquid Weber number and the air Weber number |
Atomization and crushing | Air Weber number |
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Zhang, Q.; Shi, Z.; Shi, W.; Xie, Z.; Tan, L.; Yang, Y. Research on Flow Field Characteristics in Water Jet Nozzle and Surface Damage Caused by Target Impact. Sustainability 2022, 14, 9074. https://doi.org/10.3390/su14159074
Zhang Q, Shi Z, Shi W, Xie Z, Tan L, Yang Y. Research on Flow Field Characteristics in Water Jet Nozzle and Surface Damage Caused by Target Impact. Sustainability. 2022; 14(15):9074. https://doi.org/10.3390/su14159074
Chicago/Turabian StyleZhang, Qinghong, Zhouhao Shi, Weidong Shi, Zhanshan Xie, Linwei Tan, and Yongfei Yang. 2022. "Research on Flow Field Characteristics in Water Jet Nozzle and Surface Damage Caused by Target Impact" Sustainability 14, no. 15: 9074. https://doi.org/10.3390/su14159074