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Development and application of rock breaking platform with variable cross section extrusion pulsed water jet

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Abstract

Based on the theory of hydraulic self-reversing and pressurization, a variable cross-section squeeze pulse water jet rock breaking platform was built. When the nozzle diameter is 0.5 mm, the granite erosion and crushing experiments under different driving pressures are carried out, and the depth, volume and specific energy consumption of the erosion pit are analyzed. The results show that the device can achieve intermittent injection after pressurizing the input fluid at a rate of 5.8 times. Meanwhile, the pressurization process of fluid is divided into ascending section, stable section and descending section. Compared with the continuous water jet with the same peak output pressure, the depth of destroyed granite is increased by 129 %–288 %, the volume of broken granite is increased by 37 %–121 %, and the specific energy consumption per unit of crushing volume is reduced by 21 %–74 %. The device can use low-pressure fluid to effectively crush granite.

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Abbreviations

c :

The speed at which stress waves travel in water

C 0 :

Sonic velocity

C s :

The speed at which stress waves travel in solids

C k :

The speed at which the water hammer travels in the water

d :

Nozzle outlet diameter

D :

The depth of the water jet breaking granite

E :

Specific energy consumption

i peak :

The ratio of jet outlet pressure to oil intake pressure during peak segments

i average :

The ratio of jet outlet pressure to oil intake pressure during stabilization

i design :

The ratio of jet outlet pressure to oil intake pressure in the theory design

Ma :

Mach number of jet

p :

The flow pressure

P :

Jet power

p H :

Water jet hammer pressure

p s :

The stagnating pressure of the water jet

P cwj :

Continuous jet power

P pwj :

Pulsed water jet power

p chamber.peak :

The pressure of the pressurized cavity during the peak segment

p chamber.average :

The pressure of the pressurized cavity during the stabilization segment

p oil.peak :

The oil pressure during the peak segment

p oil.average :

The oil pressure during the stabilization period

q :

The flow of the water

v :

The speed at which the droplets hit

V :

The volume of broken granite by water jet

ρ :

The density of water

ρ s :

The density of solids

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Acknowledgments

This work is the partial result of support provided by National Natural Science Foundation Outstanding Youth Fund Project (No. 51625401), Chongqing Natural Science Foundation Project (No. cstc2018jcyjAX0542), Graduate Research and Innovation Foundation of Chongqing, China (Grant No. CYB20022), the Major Research Plan of the National Science and Technology in 13th Five-Year Plan (No. 2017ZX05049-003-011) and the Program for Changjiang Scholars and Innovative Research Team in Chongqing University (Grant No. IRT17R112). We thank Elsevier Language Editing Services (www.sciencedirect.com) for its linguistic assistance during the preparation of this manuscript.

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Authors and Affiliations

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Yangkai Zhang, Yiyu Lu, Jiren Tang, Yuanfei Ling, Lei Wang, Qi Yao & Zhidan Zhu

  2. School of Resources and Safety Engineering, Chongqing University, Chongqing, 400030, China

    Yangkai Zhang, Yiyu Lu, Jiren Tang, Yuanfei Ling, Lei Wang, Qi Yao & Zhidan Zhu

Authors
  1. Yangkai Zhang
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  2. Yiyu Lu
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  3. Jiren Tang
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Corresponding author

Correspondence to Jiren Tang.

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Jiren Tang is an Associate Professor of the School of Resources and Safety Engineering, Chongqing University, Chongqing, China. He received his Ph.D. in Mining Engineering from Chongqing University. His research interests include fluid machinery, water jet technology and unconventional natural gas extraction.

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Zhang, Y., Lu, Y., Tang, J. et al. Development and application of rock breaking platform with variable cross section extrusion pulsed water jet. J Mech Sci Technol 36, 2837–2848 (2022). https://doi.org/10.1007/s12206-022-0516-9

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  • DOI: https://doi.org/10.1007/s12206-022-0516-9

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