Analytical and Experimental Study of Pressure Dynamics in a Pulsed Water Jet Device

Dehkhoda, Sevda; Hood, M.; Alehossein, Habib; Buttsworth, David

doi:10.1007/s10494-012-9393-0

Cited by 27 publications

(7 citation statements)

References 11 publications

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“…This is preferable to an ordinary jet sample on the material effect through the positive impact of broken rock. So rotating conical abrasive jet pressure on the material radial is in the form of an "extend" force and a circular "cut" force, plus the positive impact force, and it will be easy to meet or exceed the corresponding strength of the materials, which produces material destruction through stretch and shear, greatly improving the crushing efficiency [17] [18].…”

Section: Track Equation Of the Rotating Water Jetmentioning

confidence: 99%

The Research of Stress Theoretical Analysis and Structural Parameters of Sprayer Fluid of Rotating Conical Abrasive Jet

Li¹,

Ge²,

Zheng³

et al. 2015

IJHT

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The characteristics of a jet flow are analyzed. A rotating cone water jet is formed by using plus adding a special spiral section on the basis of research at home and abroad. According to the structural characteristics of the spiral groove, combined with the characteristics of the nozzle and requirements, a spin and nozzle structure is designed which has a spiral groove with certain parameters. A rotating conical water jet is thereby obtained. The force is analyzed in a high pressure pipe and fluid while spinning, and these are analyzed for the contraction in the force of the abrasive particles and the force of the fluid leaving the jet nozzle. The movement characteristics of the particles are understood as fluid in the jet formation process, which provides data support for further study for adding abrasive particles. A trajectory equation of the rotating cone water jet is derived based on the characteristics of the fluid movement, focusing on the actual movement of the fluid. The movement characteristics and mechanical properties of the fluid in a nozzle are also analyzed. The influence of nozzle structure parameters on the formation of the jet is obtained through experimental study. This shows that the cross section of the ring or circle diameter D correspondingly decreases with the increase of pitch H, and the inner diameter D essentially remains unchanged. The section shape of the basis is a circle with a center hole with a diameter of 2 mm. The brightness of the section with the hole is inferior to the condition of the one without a hole. The increasing trend of circle diameter D is more than that of the inner diameter D as the nozzle diameter di increases. These are the theoretical and experimental foundations for further optimizing spinning structures.

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Section: Track Equation Of the Rotating Water Jetmentioning

confidence: 99%

The Research of Stress Theoretical Analysis and Structural Parameters of Sprayer Fluid of Rotating Conical Abrasive Jet

Li¹,

Ge²,

Zheng³

et al. 2015

IJHT

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show abstract

“…1(a). Sdehkhoda et al [12][13][14][15] established the dynamic model of cavity pressure, and obtained the relationship between the liquid height of cavity, piston mass, nozzle diameter and pulse pressure. The advantage is that it can form large-diameter and high-speed pulsed jet, but the formation process is complicated, and water injection and resetting are required before each operation, and the continuous emission cannot be performed.…”

Section: Introductionmentioning

confidence: 99%

The Formation Principle and Characteristics of Self-supercharging Pulsed Water Jet

Ling

Tang³

et al. 2020

Preprint

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High-pressure pulsed water jet technology has high development potential in the field of rock fragmentation. Technical bottlenecks such as difficulty in pressurization and inconvenient frequency adjustment for existing types of pulsed jets, a self-supercharging pulsed water jet generation method is proposed based on the theory of pulsed water jet and principle of hydraulic boosting, which changes the flow direction of 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, so as to self-supercharging pulsed water jet. Based on revealing the formation principle of self-supercharging pulsed jet, the self-supercharging pulsed jet generation system was designed, and the self-supercharging pulsed jet testing platform was built, many groups of pressure collection and jet shape observation experiments were carried out for different operating parameters. The research results show that both the jet pressure and the jet shape show periodic change, and higher pulse pressure can be obtained at lower inlet pressure. The error of the pressure ratio calculated according to the experimental results is less than 3% compared with the theoretical design value, thus verifying the feasibility of the method . Pulse pressure and pulse frequency are controllable, that is, as the inlet flow rate increases in the stroke phase of the piston, the pulse pressure and pulse frequency increase, and the pulse duration decreases, as the inlet flow rate increase in the backward stroke phase of the piston, the pulse frequency increases, and the pulse pressure and pulse duration remain unchanged. The research results lay the foundation for enriching the theory of pulsed jet generation and expanding its application range.

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“…Su et al and Taheri et al investigated the irreversible stress‐strain evolution characteristics of rock by using the triaxial cyclic loading and unloading test method, which demonstrates that the loading test can effectively increase the rock damage and cause rock failure. Dehkhoda et al studied the influence of pulsating frequency on rock surface and its interior damage. Their studies show that the rock damage size is positively correlated with pulsating frequency under a certain condition.…”

Section: Introductionmentioning

confidence: 99%

Rock damage evolution model of pulsating fracturing based on energy evolution theory

Zhao²,

Tang

et al. 2019

Energy Science & Engineering

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Pulsating fracturing, as a new technology for unconventional oil and gas exploration, enables to enhance stimulated reservoir volume (SRV) effectively, which further helps to improve well performance. It is of great importance for the evaluation of fracturing performance and optimization of fracturing parameters by accurately calculating variables from formation impairment during pulsating fracturing treatment. Based on the principle of conservation of energy, a novel theoretical model describing the evolution of rock damage was proposed by analyzing energy evolutionary characteristics from the hysteresis loop of rock stress‐strain curve while the treatment. This model was in a good agreement with experimental data. In this paper, our study indicates that the rock damage is caused by the accumulation of damage in each cyclic loading and unloading process during pulsating fracturing. Moreover, the cumulative rock damage would increase with the increment of the number of cyclic loading and unloading. Conversely, the rock strength is negatively correlated with cyclic number. The cumulative damage variable approximates to one as the rock breaks. Additionally, the frequency and the stress level of pulsating fracturing have an obvious impact on the evolution of rock damage. The optimization of these parameters can help to accelerate the rock damage and reduce the corresponding rock strength. The speed of rock damage can be accelerated with the enhancement of the stress level at the later period of the step loading, which facilitates the increment of cumulative damage variable. Our new model provides a guideline for predicting the initial rock damage during pulsating treatment.

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Analytical and Experimental Study of Pressure Dynamics in a Pulsed Water Jet Device

Cited by 27 publications

References 11 publications

The Research of Stress Theoretical Analysis and Structural Parameters of Sprayer Fluid of Rotating Conical Abrasive Jet

The Research of Stress Theoretical Analysis and Structural Parameters of Sprayer Fluid of Rotating Conical Abrasive Jet

The Formation Principle and Characteristics of Self-supercharging Pulsed Water Jet

Rock damage evolution model of pulsating fracturing based on energy evolution theory

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