半圆环折返管内长江水固液两相流的数值模拟

Numerical simulation of solid-liquid flow of Yangtze River water in a semi-annulus reentry tube

应用欧拉两相流模型和计算流体力学对含沙长江水在半圆环形折返管中的流动进行了数值模拟，模拟结果表明，在雷诺数＆为2．8×10^4时，泥沙代表粒径ds为0．0303mm的颗粒在各种弯曲度（R／r）的折返管中都有一定的分离效果；但对于代表粒径ds为0．0102mm的颗粒基本没有分离效果；对具有明显分离效果的代表粒径ds为0．1085mm的颗粒，当弯管弯曲度R／r在10-40的范围内其分离程度相对较小。

The flow of Yangtze River water in a semi-annulus reentry tube was numerically simulated using a Eulerian Two-phase Flow Model and computational fluid dynamics. The results show that, for Reynolds number Re= 2.8 × 104, silt particles with representative diameter ds=0. 030 3 mm are separated in reentry tubes of all curvature （R/r） sizes, while silt particles with ds=0. 010 2 mm separate only slightly. Silt particles with ds = 0. 108 5 mm, which posses a strong separation effect, are separated relatively less in reentry tubes of R/r= 10-40 than in tubes with other R/r sizes.