Wenyi Lin
Tsinghua University
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Featured researches published by Wenyi Lin.
Combustion Science and Technology | 2000
Lei Zhou; Y.C. Guo; Wenyi Lin
Abstract Unlike the widely used Eulenan gas-Lagrangian particle models (particle trajectory models), two versions of two-fluid models—a pure two-fluid (FTF) model and a two-fluid-trajectory (continuum-trajectory, CT) model are proposed for simulating turbulent reacting gas-particle flows and coal combustion. Both of diem are based on Eulerian gas-phase equations, Eulenan particle-phase continuity and momentum equations, κ-ϵ-κ two-phase turbulence model, EBU-Arrhenius turbulent combustion model, six-flux radiation model, coal moisture evaporation, devolatilization and char combustion models with simultaneous three reactions. To account for the particle history effect, including the mass change due to moisture evaporation, devolatilization and char combustion and the particle temperature change due to the heat transfer between two phases, the FTF model uses Eulerian or partial differential conservation equations of particle mass, particle daf-coal mass, particle moisture and energy, while the CT model uses ...
Powder Technology | 1997
C.M. Liao; Wenyi Lin; L.X. Zhou
Abstract Turbulence interaction between gas and particle phases has been studied by numerical simulation in axisymmetric sudden-expansion chambers in this paper. A two-fluid model coupled with a k−ϵ−kp two-phase turbulence model proposed by the present authors was used in the computations. The predicted axial mean velocity, the turbulence intensity of the single phase (flow without particles) and the particle phase in two-phase flows are in agreement with the experimental data reported by Shahnam and Morris in 1989. Furthermore, predictions show that the particle mass loading strongly modifies gas-phase turbulence but has only a slight effect on particle turbulence. Comparison of the numerical results calculated by different of the k−ϵ−kp models with the experimental data indicates that the k−ϵ−k p model is inadequate and that the k−ϵ−kp model can properly predict the gas-particle turbulence in recirculating flows.
Advances in Mechanical Engineering | 2013
Haixu Liu; Bing Wang; Yincheng Guo; Huiqiang Zhang; Wenyi Lin
The backward-facing step is practically implicated in many devices, encountering the massive separation flows. In the present study, simulations of supersonic flow over a backward-facing step have been carried out employing both RANS and LES. The simulated results are validated against the experimental data. The results of RANS and LES show a good comparison with the experimental results. Different inflow Mach numbers and expansion ratios are also investigated. The reattachment length decreases with the increase of inflow Mach number. The duct height has a great effect on the flow patterns. The present conclusions are helpful to understand the physics in supersonic separation flows and also provide theory basis for engineering applications.
Advances in Mechanical Engineering | 2016
Haixu Liu; Yincheng Guo; Wenyi Lin
A pure two-fluid model was used for investigating transverse liquid jet to a supersonic crossflow. The well-posedness problem of the droplet phase governing equations was solved by applying an equation of state in the kinetic theory. A k-ε-kp turbulence model was used to simulate the turbulent compressible multiphase flow. Separation of boundary layer in front of the liquid jet was predicted with a separation shock induced. A bow shock was found to interact with the separation shock in the simulation result, and the adjustment of shock structure caused by the interaction described the whipping phenomena. The predicted penetration height showed good agreement with the empirical correlations. In addition, the turbulent kinetic energies of both the gas and droplet phases were presented for comparison, and effects of the jet-to-air momentum flux ratio and droplet diameter on the penetration height were also examined in this work.
ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference | 2003
Bing Wang; Huiqiang Zhang; Xilin Wang; Yincheng Guo; Wenyi Lin
Numerical simulations of the two-dimensional backward facing step gas-particle turbulent flow are reported. Both the evolution of large eddy coherent structures in spatially and temporally and the vortex-particle interactions are researched. Effects of the particle Stokes number and the initial two-phase velocity slip on the instantaneous concentration distribution of the particles with and without the influence of gravity are discussed. Continuous phase simulation is performed by the method of large eddy simulation (LES) while the particle phase is solved by a Lagrangian method. Simulations of the gas phase reproduce the character of the separation and reattachment flow and the essential features of the coherent structures. It is shown that the vortex structures become extraordinary abundant and complex under the high Reynolds number. Further more, the simulation shows the initial two-phase velocity slip plays an important role in enforcing particle dispersion and sharply changes the instantaneous particle distribution under the different particle Stokes numbers. Even more, results demonstrate the influence of gravity on particle dispersion and sedimentation. Such pronounces effect of gravity on instantaneous concentration of particles with increased Stokes number and initial slip coefficients emphasize the need for the consideration of gravity for horizontal particle-laden flow. Either the continuous phase results or particle phase results obtained from LES agree well with the experiment data both in quantitative and qualitative.Copyright
Powder Technology | 2015
Haixu Liu; Yincheng Guo; Wenyi Lin
Tsinghua Science & Technology | 2000
Quanlin Fan; Huiqiang Zhang; Yincheng Guo; Xilin Wang; Wenyi Lin
International Journal of Multiphase Flow | 2016
Haixu Liu; Yincheng Guo; Wenyi Lin
Tsinghua Science & Technology | 2012
Bing Wang; Huiqiang Zhang; Xilin Wang; Yincheng Guo; Wenyi Lin
Archive | 2015
Yincheng Guo; Haixu Liu; Wenyi Lin