钢筋混凝土岔管锐角区修圆优化的压强分布不均匀性研究

修圆优化是缓解钢筋混凝土岔管锐角区应力集中现象的有效措施之一.针对该措施对岔管水力特性带来的显著影响,作者选取Realizablek-ε模型,结合实际工程进行CFD数值模拟,在对岔管的流态特征与水头损失等进行分析的基础上,针对典型断面及管壁压强分布的不均匀性进行定量研究,给出了典型断面压强分布不均匀性衡量标准.结果表明,分岔处附近管壁压强分布不均匀且左右呈现较明显的不对称性,锐角区修圆半径的增大能略微降低岔管水头损失,正常发电工况下,修圆半径小于约0.5倍最大公切球半径时能小幅改善岔管流态,但继续增大修圆半径会恶化流态并增大近分岔处压强分布的不均匀程度.

Study on asymmetrical pressure distribution of rounding optimization on reinforced concrete bifurcation acute-angle-region

The particle image velocimetry (PIV) was used to characterize the fine structure of flow fields in a pool with an oblique submerged jet, and on this basis, the jet velocity distribution and turbulence characteristics in the wall-jet region were studied systemically. The results show that in the wall-jet region, the velocity and turbulence intensity distribution in each of the jet flow cross-sections were the self-similarity, which is the same as that of a free jet. In the wall-jet region, the jet velocity decreased linearly along the jet path, whereas the turbulence intensity, the jet half-width increased linearly as the jet travels. And, the equations of jet velocity and turbulent intensity distributions were proposed, the formulas to calculate the jet velocity, the turbulence intensity, the jet half-width changing along the jet path were also be obtained.