Numerical Simulation of Flow Pressure Drops for Complex Pipe Segment
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摘要: 为研究复杂结构管段内引起局部压降的原因,以核电厂中带孔洞的套管为模拟对象,采用计算流体力学(CFD)方法分别对两种不同冷却剂流动方向下管段内的三维单相流动进行了数值模拟。使用混合网格和标准k-ε湍流模型,得到了该管段内的速度场和压力场。结果表明:管段的多孔管壁处,局部的速度流线较为紊乱,产生了涡流,压降较大;不同的流动方向在该管段中产生了不同的压降形式;管道局部流动截面相对于流动方向的改变方式和改变顺序,是产生不同局部压降的重要原因。
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关键词:
- 核电厂 /
- 复杂管段 /
- 计算流体力学(CFD) /
- 数值模拟
Abstract: To study the causes for the local pressure drop,the three-dimension single-phase flow in the complex pipe segment with holes in nuclear power plants was studied with the computational fluid dynamics method under two flow conditions. The hybrid grids technique and standard k-ε turbulence model were applied. The results show that the different forms of pressure drop were caused by different flow directions in the pipe; the local stream line resulting in eddy and pressure changed greatly near the porous liner tube; how and where the cross-sections of flow channel change corresponding to the certain flow direction cause mainly different local pressure drop. -
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