Experimental study on jet pulse assembly design and numerical simulation

Xue, Liang; Han, Hwataik; Wang, Dian; Liu, Xian-Bo; Li, He; Yu, Zhiqiang

doi:10.1007/s12182-019-00396-y

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The optimal inlet diameter D1 of the self-excited oscillation cavity is calculated according to formula (1). When the pressure is 2.5 MPa and the flow rate of the liquid pump is 25L/s, the inlet diameter can be calculated by formula (5); according to the experimental and simulation results of relevant researchers, [6][7][8][9][10]17 when D2/D1=1.2~1.4, L1/D1=0.4~0.7, D/D2=4~8, the pulse effect generated by self-excited oscillation is the best. Other dimensions are matched by structural parameters as shown in Table 1.…”

Section: Preliminary Determination Of Structural Parametersmentioning

confidence: 99%

“…When D1=22mm, D2 should be greater than 28mm, the optimal value of L is 58-62mm, and the optimal value of D is greater than 80mm. [16][17][18] Using design expert software to analyze the design scheme and response value, the relationship between response value and structural parameters can be obtained.…”

Section: Optimization Design Of Structure Parameters Of Pulse Oscillator Amplifiermentioning

confidence: 99%

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Structure Optimization Design of Pulseoscillation Amplifier for Hydraulic Oscillator Based on Numerical Simulation

Xu¹

2021

TPE

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Hydraulic oscillator is one of the effective tools to solve the problem of high friction in directional drilling and horizontal drilling. However, there are some problems with this kind of tools such as high pressure loss and insufficient vibration force. Because of its self-excited oscillation characteristics, pulse oscillation amplifier can realize the amplification of pulse jet pressure under the condition of lowpressure loss, which is one of the effective ways to solve the above problems of hydraulic oscillator. In this paper, according to the working characteristics of hydraulic oscillator and the demand of pulse amplification, the structure of pulse oscillator amplifier was optimized based on numerical simulation method. Firstly, the geometric and numerical models of the pulse oscillator amplifier were constructed, and the flow field distribution and pulse amplification effect of the pulse oscillation amplifier under different structural parameters were simulated and analyzed, and the influence of different structural parameters on the pulse amplification effect was explored. Secondly, the structure of the pulse oscillator amplifier was optimized by Response Surface Method, and the optimal structure based on the effect of outlet pressure amplification was obtained: upper nozzle diameter D1=22mm, upper nozzle length L1=26mm, lower nozzle diameter D2=28mm, lower nozzle length L2=28mm, cavity length L=58mm, cavity diameter d=80mm, angle 60°. Its pressure loss was 0.3MPa and outlet pressure peak value was 4.5MPa, which was 1.8 times of the inlet pressure peak value of 2.5MPa. Finally, the minimum relative error between the experimental results and the numerical simulation results was 4%, which has verified the credibility of the numerical simulation and structural optimization results.

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Section: Preliminary Determination Of Structural Parametersmentioning

confidence: 99%

Section: Optimization Design Of Structure Parameters Of Pulse Oscillator Amplifiermentioning

confidence: 99%

Structure Optimization Design of Pulseoscillation Amplifier for Hydraulic Oscillator Based on Numerical Simulation

Xu¹

2021

TPE

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“…When the flow area widens, the pressure of the vibration part and the power part will be vented, and the disc spring will return to the original shape, releasing the accumulated energy. In this way, the drilling tool assembly on the upper part will vibrate downward, turning the sliding friction into rolling friction [15][16][17][18].…”

Section: Control System and Working Principle Of Hydraulic Oscillatormentioning

confidence: 99%

A Novel Control System of Flexible Impact Positive Displacement Motor for Underground Directional Drilling in Coalmines

Xu¹,

Hao²,

Zhao³

et al. 2020

JESA

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Underground directional drilling is an important technique to prevent and control water disasters in coalmines. However, the drilling efficiency is generally low in hard rocks, and the conventional hydraulic impactor is not applicable to underground directional drilling.To solve these problems, this paper designs a flexible impact positive displacement motor (PDM) control system, and specified the calculation methods for the relevant hydraulic parameters. Specifically, the hydraulic oscillator and conventional PDM were combined into a PDM with axial impact function. Then, the rolling-in method was introduced to determine the motion law of the disc valve, and compute the time variation of the flow area. The calculation methods were developed for the hydraulic parameters of flexible impact PDM, and adopted to compute the hydraulic parameters of Ф95mm PDM. During the calculation of the axial impact force, the fluctuating pressure difference was preset as per the pump capacity, and the multi-stage piston design was employed to produce a high axial impact force under a small pressure difference; the orifice parameters were calculated based on the fluctuating pressure difference; the impact frequency was derived from mud pump displacement, and the rotation speed and revolution-rotation speed ratio of the rotor. The results show that, when the displacement is 6.5L/s (the normal displacement underground the coalmines), the impact frequency is 12.5Hz, the fluctuating pressure difference is 1.54MPa, the impact force is 15.54kN, the inner diameter of the piston is 35mm, the outer diameter of the piston is 75mm, the offset distance of the disc valve is 4.5mm, and the orifice radius is 9.2m. The calculated results deviated from the prediction of backpropagation neural network (BPNN) by less than 5%, indicating that the structure of the proposed flexible impact PDM is feasible, and that the hydraulic parameters are calculated simply and accurately. To sum up, this research designs a PDM that can theoretically improve the rock-breaking efficiency in hard stratum, providing an important reference for similar research.

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“…However, the application scope of fluidic oscillator has been seriously bottlenecked by its high-pressure decrease in real-world scenarios, and the commutation and erosion problems of the fluidic amplifier [11]. Many scholars [12][13][14] have attempted to remove the bottleneck.…”

Section: Introductionmentioning

confidence: 99%

Performance of Jet Pulse Assembly with a Throttle Plate in a Fluidic Oscillator

Zhang¹,

He²,

Li³

et al. 2020

IJHT

Self Cite

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This paper aims to solve several defects of a 122mm fluidic oscillator in practical application, namely, unstable communication, high pressure drop, and low pulse amplitude. These defects were solved through mechanical analysis and field test. The results show that the downstroke piston rod can work smoothly, but the upstroke piston rod cannot due to the overcurrent resistance at the throttle plate. Through design optimization, the throttle plate can reduce the upward resistance, while increasing the pressure amplitude. Experiments indicate that the initial displacement of the new 122mm assembly was 5L/s. Under the displacement of 10-14L/s, the tool pressure drop fell between 1.5 and 3.5MPa, and the pulse amplitude reached 0.7-1.9MPa. The optimized tool clearly outperformed the original tool. The field tests demonstrate that the optimized tool could operate continuously for 155h without failure, and improve the drilling efficiency by 40.71%. The results fully verify the effectiveness of the optimized tool. The research results are conducive to the popularization of fluidic oscillator.

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Experimental study on jet pulse assembly design and numerical simulation

Cited by 7 publications

References 21 publications

Structure Optimization Design of Pulseoscillation Amplifier for Hydraulic Oscillator Based on Numerical Simulation

Structure Optimization Design of Pulseoscillation Amplifier for Hydraulic Oscillator Based on Numerical Simulation

A Novel Control System of Flexible Impact Positive Displacement Motor for Underground Directional Drilling in Coalmines

Performance of Jet Pulse Assembly with a Throttle Plate in a Fluidic Oscillator

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