Numerical investigation on mixture particle dispersion characteristics in swirling particle-laden combustion chamber

Liu, Yang; Zhang, Li; Chen, Ziyun; Zhou, Lixing

doi:10.1016/j.icheatmasstransfer.2020.104720

Cited by 18 publications

(8 citation statements)

References 36 publications

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“…The semi-implicit pressure linked equations-corrected (SIMPLEC) algorithm to correct p-v correlation with tri-diagonal marching algorithm (TDMA) line-by-line iteration, underrelaxation quadratic upstream interpolation, convective kinematics (QUICK) procedure and the central difference scheme (CDS) for the diffusion terms are made for the solution of the finite differential equations and this algorithm will be improved in the future based on our previous works. [26][27][28] The pressure boundary condition is set to the inlet and outlet, and the velocity boundary condition is set to the outer surface of the rotors. The boundary conditions are listed as follows: the inlet pressure is 861 Pa, outlet pressure is about 101,325 Pa, the female rotor speed is approximately 2900 r/min, the male rotor speed is 2900 r/min, respectively.…”

Section: Numerical Simulationmentioning

confidence: 99%

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Zhang

Liu

Yong-ju

et al. 2022

Advances in Mechanical Engineering

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Cross-section profile of rotor takes a great effect on the performance of dry-screw vacuum pump. A novel smooth rotor profile consisting of eight segments of curves, including arcs and conjugate correction curves is proposed. Advantages are that it can be used to solve the unsmooth connection and no meshing clearance in traditional profile. The meshing model for new profile can directly generate stable addendum clearance, tooth clearance, tooth side clearance, and radial clearance. The influences of the epicycloid rotation angle, arc radius and involute offset distance of the conjugate correction curve on the clearances are studied according to established theoretical model. And transient flow field of vacuum pump is analyzed by using the commercial software Ansys-Fluent®. Compared to traditional screw vacuum pump, the results shows that pressure in inlet and pump cavity is lower, and maximum pumping speed is higher, indicating that the proposed design is superior.

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Section: Numerical Simulationmentioning

confidence: 99%

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Zhang

Liu

Yong-ju

et al. 2022

Advances in Mechanical Engineering

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“…Gas turbulence plays an important role in the transfer of mass, momentum, and energy between gas and particle phases. It is very indispensable to obtain further understanding regarding the flow mechanism and turbulence modification by effects of particle properties, particle dispersion, and turbulent flow structure. − …”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Modeling of Turbulence Modulation by Particles in a Swirling Gas–Particle Two-Phase Flow

2021

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Turbulence modulations by particles of a swirling gas–particle two-phase flow in an axisymmetric chamber are numerically simulated. To fully consider the preferential concentrations and the anisotropic dispersions of particles, a second-order moment model coupling particle–particle collision model was improved. Experimental validation for the proposed model, algorithm, and in-house codes by acceptable match was carried out. The effects of ultralight-expanded graphite and heavy copper particles with a large span of Stokes number on gas velocities and fluctuations, Reynolds shear stresses and tensor invariants, turbulence kinetic energies, and vortice structures are investigated. The results show that turbulent modulation exhibits strong anisotropic characteristics and remains in a close relationship with the flow structure. Modulation disturbances and vortex evolution are enforced by heavy-large particles with higher Stokes numbers. Preferential accumulations of ultralight particles in shear stress regions at lower vortices are weaker than those of heavy particles. For axial turbulence modulations, a heavy particle plays the primary role in the inhibition action because of larger inertia, and a light particle contributes to the enhancement effect due to excellent followability. The instantaneous flow information and coherent turbulent structure are failed to be acquired due to the limitation of the Reynolds time-averaged algorithm.

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“…Gas turbulent flow and particle dispersions play very important roles for the mass and momentum transfer and energy exchange between gas and particle phases. In order to take an effective control for the two-phase hydrodynamics and explore the effects of particle Stokes numbers on gas turbulence modulations and particle dispersions, it is indispensable to obtain better a better understanding of the complicated multiphase mechanism by means of modeling, simulation strategy, and experimental techniques [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Pakhomov et al (2015) [24] proposed a Reynolds stresses model for gas-particle turbulence flow and revealed that gas turbulent modulation can be attenuated by fine particles, reaching up to 25% for swirling particle dispersions. As for the particle dispersions of swirling gas-particle two-phase flow in a combustor, the isotropic or homogeneous particle dispersion characteristics were denoted by references [13,14,21,24] and isotropic dispersions by references [4,5,[29][30][31][32][33][34]. In addition, the studies regarding particle dispersions of binary-particle mixture turbulent flow in a liquid-fluidized bed are also carried out.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Gas–Particle Two-Phase Flow in Swirling Combustor by the Particle Stokes Numbers

Liu

2021

Processes

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Gas turbulence modulations and particle dispersions of swirling gas–particle two-phase flow in the combustor is investigated under the large spans of the particle Stokes numbers. To fully consider the preferential concentrations and anisotropic dispersions of a particle, a kinetic frictional stress model coupled with a second-order moment two-phase turbulent model and granular temperature equation is improved. The proposed modeling and simulations are in good agreement with the experimental validations. Results show turbulent modulations and particle dispersions exhibit strongly anisotropic characteristics, keeping a close relationship with flow structure. The axial gas velocity and RMS fluctuation velocity of 45.0-μm EGP was approximately 5.0 times and 3.0 times greater than 1000.0 μm Copper particles, and their axial particle velocity was 0.25 times and twice greater than those of 45.0 μm EGP. The degree of modulation in the axial–radial direction is larger than those of radial–tangential and axial–tangential direction. Particle dispersions are sensitive to particle diameter parameters and intensified by higher Stokes number.

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Numerical investigation on mixture particle dispersion characteristics in swirling particle-laden combustion chamber

Cited by 18 publications

References 36 publications

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Hydrodynamic Modeling of Turbulence Modulation by Particles in a Swirling Gas–Particle Two-Phase Flow

Investigations of Gas–Particle Two-Phase Flow in Swirling Combustor by the Particle Stokes Numbers

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