Dynamic Simulation Model and Performance Optimization of a Pressurized Pulsed Water Jet Device
Abstract
:1. Introduction
2. Formation Principle of PPWJ
2.1. Structure of the PPWJ Device
2.2. Operational Principle of the PPWJ Device
2.3. Analysis of the Pulse Parameters of a PPWJ
3. Simulation of Dynamic Characteristics of the PPWJ Device
3.1. Simulation Model
3.2. Governing Equations
3.2.1. Dynamic Equation of the Piston
3.2.2. Dynamic Equation of the Valve Core
3.2.3. The Flow Rate Continuity Equation
3.2.4. Simulation Parameters
3.3. Simulation Results
3.4. Numerical Model Verification
4. Effect of Key Structural Parameters of the PPWJ Device on Jet Characteristics
4.1. Effect of Nozzle Diameter dn
4.2. Effect of Piston Maximum Displacement h
4.3. Effect of Piston Diameter dp3
4.4. Effect of Piston Diameter dp1 and dp2
5. Performance Optimization of the PPWJ Device
5.1. Optimization Process
5.1.1. Design Variable
5.1.2. Objective Function
5.1.3. Constraint Condition
5.1.4. Optimization Criteria
5.1.5. Optimization Results
5.2. Experiment on Rock Breaking by PPWJ
5.2.1. Experimental Apparatus and Procedures
5.2.2. Results and Discussion
6. Conclusions
- The simulation model of a jet-generation system was constructed, and the motion laws of the piston and reversing spool and the evolution characteristics of the inlet pressure and jet pressure were analyzed. The piston and valve core move reciprocally in a limited stroke. There is a short pause when the reversal of the valve core is completed, and the displacement curve is approximately trapezoidal. There is no pause during the movement of the piston, and the displacement curve is approximately sawtooth-shaped. The pressure state of the jet corresponds to the motion state of the piston one by one. The low-pressure stage and boosting stage of the jet correspond to the backward stage and stroke stage of the piston, respectively.
- The effect of the key structural parameters of the device on jet characteristics was analyzed. When the nozzle diameter or boost ratio exceeds a certain value, the pulse pressure drops and the pulse duration and pulse frequency no longer change; there is an optimal nozzle diameter or boost ratio to maximize the pulse pressure and pulse frequency. In addition, with the increase in piston maximum displacement or piston diameter dp2, the pulse duration increases and pulse frequency decreases. When the piston maximum displacement or piston diameter dp2 is lower than a certain value, the pulse pressure decreases. In addition, pulse pressure is not affected by piston diameter dp3; the increase in piston diameter dp3 results in the increase in pulse duration and decrease in pulse frequency.
- The design criterion of the key structural parameters of the generator was established, and the optimal parameters were obtained based on the design criterion and simulation results. Compared with the original device, both the pulse frequency and output energy of the jet generated by the optimized device are significantly improved without reducing the pulse pressure. The rock breaking test results show that the diameter and volume of the granite erosion pit generated by the optimized device are 1.4 and 1.5 times those generated by the original device, respectively.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameters | Value | Parameters | Value |
---|---|---|---|
Piston outer diameter dp1 (mm) | 22 | Valve core outer diameter dv2 (mm) | 24 |
Piston outer diameter dp2 (mm) | 53 | Valve core outer diameter dv3 (mm) | 28 |
Piston outer diameter dp3 (mm) | 60 | Valve core outer diameter dv4 (mm) | 26 |
Piston outer diameter dp4 (mm) | 60 | Valve core maximum displacement hv (mm) | 10 |
Piston maximum displacement hp (mm) | 35 | Rated flow rate of the pump qr (L/min) | 30 |
Nozzle diameter dn (mm) | 0.45 | Water inlet pressure p0 (MPa) | 0.3 |
Nozzle discharge coefficient Cd | 0.95 | Hydraulic oil viscosity μ (mm2/s) | 48 |
Valve core inner diameter dv0 (mm) | 15 | Hydraulic oil bulk modulus Ke (MPa) | 1200 |
Valve core outer diameter dv1 (mm) | 24 | Water density ρw0 (kg/m3) | 1000 |
Structural Parameters | Initial Value | Value Range | Gradient |
---|---|---|---|
Nozzle diameter dn (mm) | 0.5 | 0.35–0.7 | 0.05 |
Piston maximum displacement h (mm) | 35 | 20–55 | 5 |
Piston diameter dp3 (mm) | 60 | 57–78 | 3 |
Variable diameter ratio dp1/dp2 | 20/50 | 12–26/50–50 | 2/0 |
Fixed diameter ratio dp1/dp2 | 20/50 | 8–36/20–90 | 4/10 |
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Ling, Y.; Wang, X.; Tang, J. Dynamic Simulation Model and Performance Optimization of a Pressurized Pulsed Water Jet Device. Appl. Sci. 2024, 14, 6788. https://doi.org/10.3390/app14156788
Ling Y, Wang X, Tang J. Dynamic Simulation Model and Performance Optimization of a Pressurized Pulsed Water Jet Device. Applied Sciences. 2024; 14(15):6788. https://doi.org/10.3390/app14156788
Chicago/Turabian StyleLing, Yuanfei, Xiaoqiang Wang, and Jiren Tang. 2024. "Dynamic Simulation Model and Performance Optimization of a Pressurized Pulsed Water Jet Device" Applied Sciences 14, no. 15: 6788. https://doi.org/10.3390/app14156788