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90°弯管的Z形组合是电厂各种管路系统中典型的形变件组合形式,因管路布置空间狭小,故弯管间会产生不同程度的局部阻力相邻影响。采用Realizable k-ε湍流模型对两种间距的组合弯管进行数值模拟研究,采用间距为5倍管径的组合弯管试验结果对数学模型参数及方法进行了验证,并据此开展了间距为0的组合弯管数值预报模拟。通过对比分析两种组合弯管轴向流速、横断面二次流及阻力损失沿程变化,结果表明,两种组合弯管在下游弯管中流速分布表现出较大差异,弯管间距为0时下游弯管内水流轴向流速分布更加不均匀、二次流发展更成熟,组合弯管综合局部阻力损失更大。
The 90 ° elbow Z-combination is a typical form of deformation in various piping systems of power plants. Due to the narrow space of pipeline layout, different degrees of local resistance adjacent effects will occur between elbows. Realizable k-ε turbulence model was used to simulate the elbow joint with two kinds of spacings. The test results of the elbow joint with 5 times of pipe diameter were used to verify the mathematical model parameters and methods. 0 combined bend numerical prediction simulation. The axial flow velocity, cross-sectional secondary flow and the loss of resistance change of the two kinds of combined elbows were compared and analyzed. The results showed that the flow velocity distribution of the two kinds of combined elbows showed great difference in the downstream elbows. The elbows spacing was 0 When the downstream flow within the axial flow velocity distribution is more uneven, the development of secondary flow more mature, combination of pipe local resistance loss greater.