雷洪
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- 姓名:雷洪
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钢铁冶金
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雷洪,男,副教授,分别于1995年、1998年和2001年在东北大学钢铁冶金系获学士、硕士和博士学位。2001年在清华大学工程力学系从事两年博士后研究,2003年赴法国里昂中央理工大学(Ecole Centrale de Lyon)流体力学与声学实验室从事合作研究一年,2004年赴美国俄亥俄州立大学(Ohio State University)材料科学工程系从事合作研究一年,2006年在东北大学材料电磁过程研究教育部重点实验室任副教授。主要研究领域为钢铁冶金、电磁流体力学和颗粒行为。负责参加法国青年教育科研基金一项,国家自然科学基金等国家项目五项,省部级和企业项目七项。以第一作者发表论文29篇,SCI检索12篇;与他人合作发表论文11篇。获中国冶金科学技术一等奖、沈阳市优秀共产党员等多项奖励,并入选辽宁省百千万人才工程千人层次。主要研究成果如下:
1 建立了连铸过程夹杂物动态长大模型,给出了碰撞聚合后钢中夹杂物的簇状形貌和三维空间分布。
2 从理论上解释了向前(向后)差分和上风(下风)格式的数学意义和物理意义,证明了传统静电除尘器电场计算方法仅在第一象限内收敛。
3 利用声场控制自然热对流过程,得到了层流向湍流过渡的转捩点。
4 提出了任意形状矩形截面线圈磁场的积分算法。
5 开展了电磁场作用下钢的精炼和连铸过程传输现象的数学物理模拟研究,并提出了连铸中间包控流元件和结晶器水口优化方案。
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7981
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460
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成果数
9
【期刊论文】Magnetic Field, Flow Field and Inclusion Collision Growth in a Continuous Caster with EMBR
雷洪, Hong Lei, Guangjun Xu, Jicheng He
Chem. Eng. Technol. 2007, 30, No. 12, 1650-1658,-0001,():
-1年11月30日
A three-dimension mathematical model has been developed to describe the magnetic field, fluid flow and inclusion transport in a continuous caster with electromagnetic brake (EMBR). According to the model, all the governing equations can be expressed as a general differential equation, so a general numerical method was developed to solve these equations. The numerical results agree well with the experimental result. In the continuous caster, the inclusion distributions have ‘M’ shape under the nozzle and ‘W’ shape at the exit, which come from the centrifugal effect and the collision and aggregation among inclusions. The three-dimensional static magnetic field can effectively damp local flows and affect the inclusion transport in a continuous caster. If EMBR is installed under the nozzle, it can promote the inclusion removal and the inclusion ‘M’ distribution disappears.
Flow Field, Magnetic Fields, Modeling, Steels
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雷洪, Hong Lei
IEEE Transactions on Dielectrics and Electrical Insulation Vol. 13, No. 4; August 2006,-0001,():
-1年11月30日
Charge-conservation model proposed by Leutert and McDonald has been widely used to calculate the electrical conditions in the wire-plate electrostatic precipitator, but the arbitrary selection of the wire roughness factor in the Peek's formula limits its application. To address this issue, we propose charge-current-conservation model and solve it by the control-volume method. Numerical experiment shows that the predicted electric potentials agree well with the existing experimental data.
Charge transfer, current distribution, corona, corona electrical conductivity, redundant equations, electrostatic precipitators, staggered grid, control-volume method
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雷洪, Hong Lei, Lian-Ze Wang, Zi-Niu Wu
IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 6, NOVEMBER 2002,-0001,():
-1年11月30日
The integral method can effectively analyze magnetic fields, but the traditional integral method can analyze only coils with regular geometries. Therefore, a new integral method was developed to calculate the three-dimensional (3-D)magnetic field created by an arbitrary geometry coil with a rectangular cross section using the local coordinate method and a 3-D coordinate transformation. However, when the field points are on the surface of the coil or the basic segment is the right angle trapezoidal prism, singularities occur that make the numerical analysis of the magnetic field more difficult. Thus, we present here some mathematical methods to eliminate the singularities to allow accurate numerical analysis of the magnetic field. We validate the integral method by comparing it with the analytical solutions for regular geometry coils.
Arbitrary geometry coil, integral method, singularity treatment, stationary magnetic field.,
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雷洪, H. Lei, M. Y. Zhu, J. C. He
International Journal of Cast Metals Research 2007, VOL. 20, NO. 2,-0001,():
-1年11月30日
Whether the bubble is trapped by the sold/liquid interface or not depends on its dynamic behaviour ahead of the interface. Thus, a mathematical model has been developed to investigate the movement of the bubble near the advancing solid/liquid interface. Based on the boundary layer theory, the velocity distribution near the solid/liquid interface was obtained. The motion of bubble was studied by using the particle’s trajectory model. The results show that the behaviour of the bubble is controlled by the physical property of the bubble and the fluid flow near the solid/ liquid interface. In the continuous casting machine, the bubble can reach the solid/liquid interface if it moves in the stream directed upward or downward near the vertical solid/liquid interface or in the horizontal flow under the solid/liquid interface. However, the bubble cannot reach the solid/ liquid interface if it moves in the horizontal flow above the solid/liquid interface.
Bubble, Fluid flow, Solid/, liquid interface, Boundary layer
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雷洪, Hong Lei, Daniel Henry, Hamda BenHadid
International Journal of Heat and Mass Transfer 49 (2006) 3601–3616,-0001,():
-1年11月30日
Numerical experiments have been performed in order to investigate the convection in an enclosure of aspect ratios 5:1:1.3 subject to a horizontal temperature gradient and a longitudinal sound field. The governing equations are solved by a spectral element method. Different flow structures appear when increasing (or decreasing) the Grashof number. Without acoustic field (acoustic Froude number Fr = 0), a hysteresis occurs connected to a first steady bifurcation with breaking of symmetry, but for Fr≠0, no hysteresis is observed as this symmetry is no more effective. The further transition to oscillatory flow is found to be stabilized by the acoustic field. Depending on Fr, this transition can occur with or without the breaking of the left–right symmetry.
Rayleigh streaming, Standing wave, Thermal convection, Hysteresis, Bifurcation
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【期刊论文】Collision and Coalescence of Alumina Particles in the Vertical Bending Continuous Caster
雷洪, Hong LEI, Lianze WANG, Ziniu WU, Junfei FAN
ISIJ International, Vol. 42 (2002), No. 7, pp. 717–725,-0001,():
-1年11月30日
after coalescence relative to the mass and population conservation. Since the motion of cluster-shaped inclusions differs from that of spherical inclusions, the inclusion physical parameters were modified. The results showed that the inclusions congregated approximately one fourth of the face width from the slab edge so that the characteristic radius distribution of the inclusions had a ‘W’ shape, while the inclusion concentration and number density had an inverse ‘W’ shape in the longitudinal direction. More inclusions were trapped near the inner arc and they had larger characteristic radii than those near the outer arc. The concentration and inclusion number density decreased with the distance from the free surface, but the inclusion radius increased.
inclusion, size, collision, coalescence, vertical bending continuous caster, mathematical model.,
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47浏览
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雷洪, Hong Lei, Lian-Ze Wang, Zi-Niu Wu
Journal of Computational Physics 193 (2004) 697–707,-0001,():
-1年11月30日
The traditional finite difference method has been widely used to calculate two-dimensional electrical conditions in the wire–plate electrostatic precipitation and the calculation domain has to be confined in the first quadrant of single discharge electrode on the base of the symmetry assumption. In order to remove the symmetry assumption, an un- conditional convergent numerical method, in which the upwind (or downwind) scheme was used for the positive (or negative) corona, is presented to calculate the three-dimensional distributions of the electric potential and the space charge in a wire–plate electrostatic precipitator. And the predicted electric potentials agree well with existing experimental data.
Upwind scheme, Downwind scheme, Control-volume method, Electrostatic field, Space charge, Electrostatic precipitator
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62浏览
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雷洪, Hong Lei, Lian-Ze Wang, Zi-Niu Wu
Journal of Electrostatics 66 (2008) 130–141,-0001,():
-1年11月30日
The behavior of charged particles in turbulent gas flow in electrostatic precipitators (ESPs) is a crucial information to optimize precipitator operation. In this paper, a three-dimensional numerical simulation was performed to predict complex physical phenomena in a wire-plate electrostatic precipitator. The numerical simulation included the Eulerian approach for electrostatic fields and EHD turbulent flow fields, and the Lagrangian approach for in situ particle charging and tracing in which the effect of turbulence was also considered. The numerical result shows that the flow distortion in an ESP is caused by the circulatory cells near the grounded plate, and the turbulence intensity in an ESP without inlet velocity is much higher than that with inlet velocity. Moreover, the flow turbulence causes the particles to have different electric charges when their diameter lies in the range of 0.5-5 μm. Finally, the Basset history and gravitational forces play an important role at the initial stage of the particle’s movement in the ESP.
Electrostatic precipitator, Electrostatic field, Turbulent flow, Particle charging and tracing, Monte-Carlo method
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【期刊论文】A dynamic model of alumina inclusion collision growth in the continuous caster
雷洪, Hong Lei, Ji-Cheng He
Journal of Non-Crystalline Solids 352 (2006) 3772–3780,-0001,():
-1年11月30日
The number and morphology of non-metallic inclusions are the key factors to estimate the quality of the steel product, so it is of particular importance to have a profound knowledge about the collision and aggregation among the inclusions in the molten steel. In this paper, a three-dimensional mathematic model was developed to predict the dynamic growth of alumina inclusions in the continuous caster. This model includes Eulerian approach for turbulent flow field and inclusion’s concentration and number density fields, and Lagrangian approach for inclusion’s collision growth. The numerical results indicate that the convective transfer leads to the ‘W’ distributions of inclusion in the continuous caster. This phenomenon is consistent with Javurek’s experiment. For a single inclusion, the larger inclusion has more chances to trap other inclusions, and the trapped inclusions tend to be the smaller inclusions with diameter less than 10 μm. The aggregated inclusions are dendritic with some tips and arms, which have been observed in Yin’s experiment. Cluster formation of alumina inclusion depends on the turbulent flow, which contributes to the enhancement of the collision rate and determines the inclusion growth mechanism.
Diffusion and transport, Modeling and simulation, Monte Carlo simulations
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