90°弯管内气固两相湍流流动的数值研究

利用两相湍流KET模型对90°弯管内气固两相湍流流动进行了数值模拟,得到了弯管内两相流动的一些规律,并提出用颗粒动理学压力来定性表征弯管内磨损严重部位,为管道抗磨损设计提供了一定的理论依据。

NUMERICAL STUDY OF GAS-SOLID TURBULENT FLOW IN A 90 BEND

Numerical study of gas-solid turbulent flow in a 90 bend was performed with KET model of two-phase turbulent flow, and some features of two-phase flow in the bend were captured. The maximum value of fluid velocity profiles is displaced toward the inner wall before 60 station and later toward the outer wall at 90 station; and the particulate velocity profiles are relatively flat. Particles follow the gas flow into the bend entrance and then, due to their own inertia, collide with the outer wall directly, and at the outlet they follow the fluid flow again. So the particle concentration is increased greatly in the region near the outer wall, and the particle kinetic pressure also in increased at outer wall. This shows that only the outer wall was impacted by particles and the inner wall was, in general, erosion free. It is proposed that severely erosive place can be described qualitatively by particle kinetic pressure. The detailed numerical Computation of two-phase flows in curved ducts would also enable material scientists and engineers to predict and study parametrically the erosion characteristics and mechanism in such geometry, and subsequendy to improve the design of components.