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https://doi.org/10.13465/j.cnki.jvs.2017.19.028

Numerical simulation and analysis on the flow field structure and hard rock erosion potential of a disc-slotted pulse water jet

Oct 15, 2017
Journal of Vibration and Shock
Zhanwu Lu +4 more

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A disc-slotted pulse water jet is a potential tool to break hard rock due to its special loading styles, such as the water hammer pressure, ultra-speed lateral jetting and pulse dynamic load etc. Aiming at investigating the flow filed of the jet, a two-phase-flow transient computational model, matching with the geometry and motion of the interrupted water jet generating device, was established to simulate the dynamic evolution and characteristics of a single pulsation within 100 mm standoff based on the volume of fluid (VOF) model and dynamic mesh theory. The results show that at the head of the pulsed jet forms a deflective slug structure which is consistent with the result from high-speed photography experiments. The slug head velocity is lower than that at the jet outlet and the jet turbulence is mainly distributed over boundary layers between jet and air and at the deflective side. Tile-shaped stereo-structure is yielded during the pulse formation process. It presents non-axisymmetric flow pattern when impacting target, which consists with the irregular erosion cavity obtained by hard rock fragmentation experiments.

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CitationsShowing 4 of 4 papers

Research Article
26
10.1007/s40430-021-03212-0

Numerical study of coupled flow in blocking pulsed jet impinging on a rotating wall

Oct 22, 2021
Journal of the Brazilian Society of Mechanical Sciences and Engineering
Li Zhang + 5 more

Numerical study of coupled flow in blocking pulsed jet impinging on a rotating wall

Research Article
15
10.1016/j.wear.2021.204145

Experimental investigation on the penetration characteristics of low-frequency impact of pulsed water jet

Oct 19, 2021
Wear
Zu’An Wang + 8 more

Experimental investigation on the penetration characteristics of low-frequency impact of pulsed water jet

Research Article
9
10.1063/5.0052853

Development of a hydraulically controlled piston-pressurized pulsed water jet device and its application potential for hard rock breaking.

Aug 1, 2021
Review of Scientific Instruments
Yuanfei Ling + 5 more

To improve the efficiency of hard rock breaking by a pulsed water jet (PWJ), a hydraulically controlled piston-pressurized PWJ (HCPPPWJ) device has been developed, by which the large amplitude pressurization of the jet could be realized through the motion coupling of the piston and the valve core inside the device without requiring additional control or ultra-high-pressure components. Under the continuous injection of low-pressure hydraulic oil, the device has a stable pressurization effect and controllable pulse pressure and pulse frequency. The jet pressure varies periodically with the alternation of high and low pressures; in the rising stage of the pulse pressure, the jet morphology presents an umbrella-like thin-layer structure, which ensures an effective initial impact force of the jet in contact with the target. With the addition of high-frequency stress waves and water wedge pressure, local flaky exfoliation was observed when the granite surface was eroded, and the maximum radius and volume of the erosion pit were greater than those in the case of employing a continuous water jet. Compared with the interrupted PWJ, the HCPPPWJ efficiently utilizes the jet energy during the erosion process, and the specific energy is lower. The results prove that the HCPPPWJ device is an advanced tool in the field of hard rock breaking.