Research on Structural Parameters of Conical Nozzle

Huang, Zhong Hua; Xie, Yi

doi:10.4028/www.scientific.net/amm.84-85.368

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Guha, Barron, and Balachandar (2011) studied the structural characteristics of a high-speed jet in the radial and axial directions and analyzed the core length and diffusion angle of the jet. Huang and Xie (2011) established the interior flow field numerical simulation model of a conical nozzle to investigate the interacting rules between the nozzle structure parameters and its working performance, and obtained the effects of the nozzle shrink angle and slenderness ratio on the jet velocities. Han and Ma (2016) analyzed the influences of the nozzle structures (nozzle conical surface form: line form, concave form and protruding form; nozzle cone angle) on the flow field and optimized the structural parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the flow field structure and deflection characteristics of water jets under nozzle moving conditions

Xiao

Ren

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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High-pressure water jets under nozzle moving conditions are widely utilized for rock breakage in geotechnical engineering. The nozzle motion state significantly influences the jet flow field and flow characteristics, thus changing its rock-breaking performance. In this paper, a single-jet nozzle model with different traverse speeds was established to investigate the jet flow field features and deflection characteristics and analyze the effects of nozzle traverse speed and jet pressure through numerical simulations. The jet flow fields under nozzle fixed and moving conditions were compared in terms of the distributions of vorticity, velocity, pressure and turbulence kinetic energy, and deflection characterization. Jet flow patterns photographed by an ultra-high-speed camera indicated the deflection of the jet flow field under the nozzle moving condition. The simulation results show that the flow field structure of the moving jet contains the non-deflection zone and deflection zone. The jet timeaveraged velocity and vorticity are distributed symmetrically in the non-deflection zone, which is similar to the flow patterns under the nozzle fixed condition. As the jet prolongs further, the vorticity value increases and the vorticity distribution is more concentrated and closer to the nozzle outlet in the moving direction owing to more intense turbulence, resulting in the non-self-similarity of jet velocity dimensionless distribution on cross-sections and jet flow deflection to the opposite direction. The faster the traverse speed and the lower the jet pressure, the greater the jet flow deflection degree. The jet centerline velocities decay exponentially with the standoff distance, and the attenuation degree increases as the traverse speed increases. As the standoff distance increases, the jet deflection distance increases in a quadratic parabola and the deflection angle and impact angle both increase linearly, and decrease exponentially with increasing jet pressure. There is a positive relationship between the jet deflection characterization and the traverse speed.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis on the flow field structure and deflection characteristics of water jets under nozzle moving conditions

Xiao

Ren

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Structure optimization of straight cone nozzle and its effect on jet impingement heat transfer

Yang,

Zhang,

Yuan

et al. 2023

Numerical Heat Transfer, Part A: Applications

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Mathematical modeling and analysis of energy conversion efficiency of particle jet accelerating nozzle

Fang

Ren

Cheng

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The impact kinetic energy of particle jet determines rock-breaking effect and velocity, and as acceleration device of particle jet, the energy conversion efficiency of nozzle determines rock-breaking efficiency. According to three different types of nozzles of the straight-taper nozzle, the pressure drop model and energy conversion efficiency of particle jet was established, and the energy conversion efficiency under different type nozzles was studied. And then, the acceleration ability of different nozzles for was analyzed with simulation. The results of model calculation and simulation show that constant-acceleration nozzle has the best acceleration ability and energy conversion efficiency. The rock-breaking experiment was carried out with the adopted nozzle, and comparison analysis between experimental results and numerical calculation prove that the applicability of mathematical model.

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Research on Structural Parameters of Conical Nozzle

Cited by 3 publications

References 4 publications

Numerical analysis on the flow field structure and deflection characteristics of water jets under nozzle moving conditions

Numerical analysis on the flow field structure and deflection characteristics of water jets under nozzle moving conditions

Structure optimization of straight cone nozzle and its effect on jet impingement heat transfer

Mathematical modeling and analysis of energy conversion efficiency of particle jet accelerating nozzle

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