Investigation of the impact characteristics and pulse mechanism of a self-excited aspiration pulsed jet device

Liu, Xinyang; Xu, Huanming; Zhao, Li; Yu, Xiaolong; Chen, Hao; Zhang, Shibin; Ji, Jianhong

doi:10.1016/j.expthermflusci.2021.110371

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The vortex ring in the centre of the chamber becomes larger, forming a squeeze on the central airflow, driven by the main stream to collide with the collision wall, when the collision wall local pressure increases, thus making the speed of the disturbance wave blocked, and finally through the outlet mouth to form a certain frequency of pulse jet outflow, forming a self‐excited oscillating pulsating flow. When the release of the vortex ring touching the wall is complete, the chamber again undergoes a gathering of energy, forming a self‐periodic gathering and release, resulting in a self‐excited oscillating periodic pulsating flow 19 . The mechanism of action and structural dimensions are shown in Figure 9.…”

Section: Derivation Of Self‐excited Oscillating Cyclone Extraction Toolmentioning

confidence: 99%

“…When the release of the vortex ring touching the wall is complete, the chamber again undergoes a gathering of energy, forming a selfperiodic gathering and release, resulting in a self-excited oscillating periodic pulsating flow. 19 The mechanism of action and structural dimensions are shown in Figure 9.…”

Section: Derivation Of Self-excited Oscillating Cyclone Extraction Toolmentioning

confidence: 99%

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Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

Liang

Jiang

et al. 2023

Asia-Pacific J Chem Eng

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The accumulation of fluid in the wellbore of a natural gas well can seriously affect the production of the well and can even lead to the well flooding and stopping production. The conventional cyclone tool has low kinetic energy, serious energy loss and short effective distance of spiral flow in the process of gas well drainage and gas recovery, thus affecting the efficiency of gas well drainage and gas recovery. In response to the above problems, this paper proposes a new cyclonic drainage solution combining self‐excited oscillating pulse jet and cyclonic flow. The liquid‐carrying air flow through the oscillating chamber forms a large vortex ring and the flow pattern squeezes the central air flow inwards, allowing the return vortex at the wall to develop effectively, increasing the return vortex velocity and increasing the velocity at the centre of the squeezed pulsating flow. In this paper, based on theoretical analysis and experimental research, the numerical simulation results are compared with the various drainage performance of conventional cyclone tools. The results show that the pressure drop and critical fluid‐carrying velocity of the cyclone section are significantly reduced, and the average tangential velocity of the cyclone section and the effective action distance of the cyclone tool are significantly increased, indicating that the new cyclone tool can improve the fluid‐carrying capacity of gas wells by changing the flow pattern of the gas–liquid medium without increasing energy consumption.

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Section: Derivation Of Self‐excited Oscillating Cyclone Extraction Toolmentioning

confidence: 99%

Section: Derivation Of Self-excited Oscillating Cyclone Extraction Toolmentioning

confidence: 99%

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

Liang

Jiang

et al. 2023

Asia-Pacific J Chem Eng

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“…The results show that there is a close relationship between the vortex-cavitation interaction and the flow mechanism. Liu et al [11] designed a self-excited aspiration pulsed jet device based on a traditional low-frequency self-excited oscillation pulsed jet device and revealed its impacts, characteristics, and pulse mechanism through experiments. Wang et al [12][13][14] analysed the effects of the structural parameters of nozzles on the jet's peak velocity and oscillation frequency through numerical simulations and experiments and obtained optimised SOPJN structural parameters.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Zhang

Sun

2021

Processes

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Self-excited oscillation pulse jet technology is widely used to clean sediment from oil storage tanks. Its successful application is dependent on jet performance. As the cleaning requirements of the oil industry increase, it is necessary to optimise the structure of self-excited oscillation pulsed jet nozzles (SOPJNs) to optimise cleaning and energy efficiencies. In this study, the jet performance of a SOPJN is modelled and analysed based on computational fluid dynamics with consideration of a large eddy simulation and homogeneous cavitation. The modelling results are highly consistent with experimental results. The effects of the SOPJN’s inlet diameter, cavity diameter, cavity length, wall reflection angle, and inlet pressure on the jet’s peak velocity, oscillation frequency, and cavitation number were analysed. The results show that the oscillation frequency decreases with the increase of the inlet diameter d1, cavity diameter D, cavity length L and reflection angle of wall α. Optimisation of the SOPJN inlet diameter, cavity length, and wall reflection angle produced a jet with a high peak velocity and strong cavitation. The optimal nozzle cavity diameter strengthens cavitation, while the peak velocity fluctuates as the cavity diameter increases. The peak velocity increases with the inlet pressure, while the increasing rate of the peak velocity decreases. The results of this study can be used in the design and optimisation of similar nozzle structures for improved pulse jet cleaning.

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Damage evolution and fracture characteristics of coal rock impacted by self‐excited pulse water jet under different stress loading conditions

Ma,

Wan,

et al. 2024

Energy Science & Engineering

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In this paper, based on smoothed‐particle hydrodynamics‐finite element method, numerical models of plunger squeezing water at a sinusoidal velocity were established to simulate self‐excited pulse water jet (SEPWJ). RHT constitutive model was adopted to describe the damage and failure of coal rock impacted by water jet. The morphological evolutions of broken pits and timeliness of rock‐breaking efficiency of SEPWJ and continuous water jet (CWJ) under the conditions with and without stress loadings were obtained and compared. The evolution laws of damage and stress inner coal rock induced by jet impact, and the failure mechanism were revealed. And the influences of different stress loading magnitudes on the fracture characteristics of coal rock were investigated. The results show that the morphologies of broken pits formed by self‐excited pulse jet undergo changes in a semi‐circular, U‐shaped, V‐shaped, and bullet shaped in sequence under the stress‐free loading condition. When applying one‐dimensional (1D) and 2D stress loadings, the shallow but wide broken pits with laminar main cracks along the stress loading direction and the inverted trapezoidal bowl broken pits are formed, respectively. With the increase of 1D stress, the depth and width of broken pits slightly decrease as a quadratic parabolic function and linearly increase, respectively. And the broken pit width and area both show an exponential slow decreasing trends with the increasing 2D stress. SEPWJ can induce higher stresses to cause the earlier occurrence of initial damage and the shorter duration of damage accumulation to coal rock than CWJ, which leads to a better rock‐breaking effect. The surface and deeper coal rock elements are broken mainly due to compressive shear stresses. The 2D stress loading delays the initial damage occurrence and prolongs the damage accumulation duration due to inhibitory effect of stress loading on jet impact.

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Investigation of the impact characteristics and pulse mechanism of a self-excited aspiration pulsed jet device

Cited by 6 publications

References 24 publications

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Damage evolution and fracture characteristics of coal rock impacted by self‐excited pulse water jet under different stress loading conditions

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