High-pressure pulsed water jet technology has considerable development potential in the field of rock fragmentation. To overcome the shortcomings of existing pulsed jets, a self-supercharging pulsed water jet (SSPWJ) generation method is proposed, which is based on the theory of the pulsed water jet and the principle of hydraulic boosting. The proposed method changes the flow direction of the fluid medium through the valve core to make the piston reciprocate in the cylinder and relies on the effective area difference between the front and rear chambers in the stroke stage of the piston to realize the organic combination of "pulse" and "supercharging" of the jet, thus forming an SSPWJ. On the basis of the formation principle of the SSPWJ, a SSPWJ testing platform was constructed, and tests were performed on the jet pressure acquisition, morphology capture, and granite erosion. Both the jet pressure and the jet morphology exhibited periodic changes, and a higher pulse pressure was obtained at lower inlet pressure. The error of the pressure ratio calculated according to the experimental results was < 3% relative to the theoretical design value, confirming the feasibility of the method. The pulse pressure and pulse frequency are controllable; that is, as the inlet flow rate increases in the stroke stage of the piston, the pulse pressure and pulse frequency increase, and the pulse duration decreases. As the inlet flow rate increases in the backward-stroke stage of the piston, the pulse frequency increases, and the pulse pressure and pulse duration remain unchanged. Under the combined action of the water-hammer pressure, high-speed lateral flow, and high-frequency dynamic load of the SSPWJ, local flaky exfoliation was observed when the granite surface was eroded. The results of this study lay the foundation for enriching the theory of pulsed jet generation and expanding its application range.
Zhaolong Ge
,
Yuanfei Ling
,
Jiren Tang
,
Yiyu Lu
,
Yangkai Zhang
,
Lei Wang
,
Qi Yao
. Formation Principle and Characteristics of Self-Supercharging Pulsed Water Jet[J]. Chinese Journal of Mechanical Engineering, 2022
, 35(3)
: 51
-51
.
DOI: 10.1186/s10033-022-00713-4
[1] A W Momber. Fluid jet erosion as a non-linear fracture process: A discussion. Wear, 2001, 250(1-12): 100–106.
[2] A W Momber. An SEM-study of high-speed hydrodynamic erosion of cementitious composites. Wear, 2003, 34(2): 135-142.
[3] S Y Liu, Y M Cui, Y Q Chen, et al. Numerical research on rock breaking by abrasive water jet-pick under confining pressure. International Journal of Rock and Ming Sciences, 2019, 120: 41-49.
[4] Y Y Lu, F Huang, X C Liu, et al. On the failure pattern of sandstone impacted by high-velocity water jet. International Journal of Impact Engineering, 2015, 76: 67-74.
[5] G S Li, Z H Shen, C S Zhou, et al. Investigation and application of self-resonating cavitating water jet in petroleum engineering. Petroleum Science and Technology, 2005, 23(1): 1-15.
[6] M M Vijay, J Remisz, X Shen. Potential of pulsed water jets for cutting and fracturing of hard rock formations. International Journal of Surface Mining and Reclamation, 1993, 7(3): 121-132.
[7] J E Field. Liquid impact: Theory, experiment, applications. Wear, 1999, 233–235: 1–12.
[8] C F Kennedy, J E Field. Damage threshold velocities for liquid impact. Journal of Materials Science, 2000, 35: 5331-5339.
[9] A W Momber. The response of geo-materials to high-speed liquid drop impact. International Journal of Impact Engineering, 2016, 89: 83-101.
[10] Z A Wang, Y Kang, X C Wang, et al. Effects of modulation position on the impact performance of mechanically modulated pulsed water jet. Journal of Manufacturing Processes, 2020, 56: 510-521.
[11] Y Liu, J P Wei, T Ren, et al. Experiment study of flow field structure of interrupted pulsed water jet and breakage of hard rock. International Journal of Rock Mechanics and Mining Sciences, 2015, 78: 253-261.
[12] A Polyakov, A Zhabin, E Averin, et al. Generated equation for calculating rock cutting efficiency by pulsed water jets. Journal of Rock Mechanics and Geotechnical Engineering, 2019, 11: 867-873.
[13] H S Li, S Y Liu, J G Jia, et al. Numerical simulation of rock-breaking under the impact of self-excited oscillating water jet. Tunnelling and Underground Space and Technology, 2020, 96: 103179.
[14] S Dehkhoda, N K Bourne. Production of a high-velocity water slug using an impact technique. Review of Scientific instruments, 2014, 85(2): 1-5.
[15] G Rehbinder. Investigation of water jet pulses generated by an impact piston device. Applied Scientific Research, 1983, 40(1): 7-37.
[16] S Dehkhoda, M Hood, H Alehossein, et al. Analytical and experimental study of pressure dynamics in a pulsed water jet device. Flow, Turbulence and Combustion, 2012, 89: 97-119.
[17] Y Liu, J P Wei. On the formation mechanism and characteristics of high-pressure percussion pulsed water jets. Fdmp-fluid Dynamics & Materials Processing, 2015, 11(3): 221-240.
[18] S Dehkhoda, M Hood. An experimental study of surface and sub-surface damage in pulsed water-jet breakage of rocks. International Journal of Rock Mechanics & Mining Sciences, 2013, 63: 138-147.
[19] S Dehkhoda, M Hood. The internal failure of rock samples subjected to pulsed water jet impacts. International Journal of Rock Mechanics & Mining Sciences, 2014, 66: 91-96.
[20] P Raj, S Hloch, R Tripathi, et al. Investigation of sandstone erosion by continuous and pulsed water jets. Journal of Manufacturing Processes, 2019, 42: 121-130.
[21] M Zelenak, J Foldyna, J Scucka, et al. Visualisation and measurement of high-speed pulsating and continuous water jets. Measurement, 2015, 72: 1-8.
[22] S Hloch, A Nag, F Pude, et al. On-line measurement and monitoring of pulsating saline and water jet disintegration of bone cement with frequency 20 kHz. Measurement, 2019, 147: 106828.
[23] D Hu, X H Li, C L Tang, et al. Analytical and experimental investigations of the pulsed air-water jet. Journal of Fluids and Structures, 2015, 54: 88-102.
[24] Y P Qu, S Y Chen. Orthogonal experimental research on the structure parameters of a self-excited pulsed cavitation nozzle. European Journal of Mechanics B/Fluids, 2017, 65: 179-183.
[25] D Li, Y Kang, X L Ding, et al. Effects of area discontinuity at nozzle inlet on the characteristics of high speed self-excited oscillation pulsed waterjets. Experimental Thermal and Fluid Science, 2016, 79: 254-265.
[26] D Li, Y Kang, X L Ding, et al. Effects of area discontinuity at nozzle inlet on the characteristics of self-resonating cavitating waterjet. Chinese Journal of Mechanical Engineering, 2016, 29(3): 813-824.
[27] M Huang, Y Kang, X C Wang, et al. Experimental investigation on the impingement characteristics of a self-excited oscillation pulsed supercritical carbon dioxide jet. Experimental Thermal and Fluid Science, 2018, 94: 304-315.
[28] Y Liu, J P Wei, T Ren. Analysis of the stress wave effect during rock breakage by pulsating jets. Rock Mechanics and Rock Engineering, 2016, 49(2): 503-514.
[29] Y Z Xue, H Si, Q T Hu. The propagation of stress waves in rock impacted by a pulsed water jet. Powder Technology, 2017, 320: 179-190.
[30] H X Jiang, Z H Liu, K Gao. Numerical simulation on rock fragmentation by discontinuous water-jet using coupled SPH/FEA method. Powder Technology, 2017, 312: 248-259.
[31] S H Hong, K W Kim. A new type groove for hydraulic spool valve. Tribology International, 2016, 103: 629-640.
