定常和非定常计算方法在固粒磨蚀数值模拟中的应用研究

摘要

Using Euler/Lagrange-solid two-phase flow model,a steam turbine nozzle stage is numerically simulated by the steady and unsteady NS solvers. The two calculation methods are compared to find the difference of the trajectory of solid particle passing through the rotor/stator' s interface as well as the downstream rotor blade channel. Studies have indicated that the whole pressure surface of the guide vane is a seriously eroded region and the central part of the rotor pressure surface is the region beard badly impacting abrasion and scouring abrasion. The steady numerical simulation gives a smaller solid particle's sedimentary area,and the solid particle erosion is underestimated. By the unsteady numerical simulation,the more accurate peak value and total amount of the particle erosion on the solid surface are both obtained.%采用Euler/Lagrange气固两相流动模型,对某透平喷嘴级进行了定常与非定常的数值模拟,比较了两种计算方法多固体颗粒穿越转/静叶交界面以及在下游动叶通道内运动轨迹的差别.研究指出,导叶整个压力面都是固粒磨蚀的严重区域,动叶压力面中部是承受冲击式磨损与擦伤磨损的严重区域.定常计算得到的固粒沉积面积偏小,弱化了固粒对壁面的磨蚀程度;非定常时间精确解能获得比较准确的固粒对壁面的磨蚀峰值以及被磨蚀壁面的磨蚀总量.