Application of Lagrangian Particle Tracking Method in Study of Steam Generator Sludge Collector
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摘要: 通过计算流体动力学(CFD)方法,采用拉格朗日粒子追踪模型,充分考虑泥渣颗粒与流场之间的相互作用,得到蒸汽发生器泥渣收集器内、外的流场分布及泥渣颗粒的运动轨迹,并在此基础上分析泥渣收集器对不同直径泥渣颗粒的收集效果及进、出口孔径对泥渣收集器收集能力的影响。结果表明:泥渣收集器的收集能力很大程度取决于外部流场对泥渣颗粒的输运效果;泥渣收集器对不同直径的泥渣颗粒的收集能力有较大差异,尺寸较大的泥渣颗粒更容易被收集;在保证泥渣收集器内不出现再携带现象的前提下,增加泥渣收集器进、出口孔径是提高收集能力的有效手段。Abstract: The flow conditions and the tracks of sludge particles around the sludge collector in a typical U-tube recirculating steam generator are studied by a Computational Fluid Dynamics method. To evaluate the main factors affecting the deposition process of sludge particles, a Lagrangian Particle Tracking scheme is employed to account for the momentum transfer between the continuous phase of fluid and the discrete phase of particles. It shows that the performance of a sludge collector depends heavily on the transportation effects of flow field outside the sludge collector. The results for different particle diameters indicate that the particles with a larger diameter are more likely to be captured by the sludge collector. By increasing the inlet and outlet area on the top plate, the sludge collector performance can be obviously elevated with a limit of avoiding particle re-entrainment phenomenon.
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