【摘要】 以90°大弯径比挠性弯管为研究对象，基于离散相模型和General冲蚀模型，利用Fluent数值仿真软件，开展不同工况下气相进口速度、夹带固体颗粒质量流量、弯管肋条及弯径比等影响因素对弯管内气固两相流冲蚀特性的数值模拟研究。研究结果表明：弯管纵切面气固两相流场速度分布存在分离现象；弯管的最大冲蚀速率随气相进口速度的增长呈指数关系，随颗粒质量流量的增长呈线性关系，随肋条数目的增长先减小后略微增大最后趋于稳定；大弯径比弯管内部流场二次流强度小且肋条的存在使弯管的耐冲蚀性能得到一定的提升；弯管冲蚀最严重区域发生在弯管沿流动方向偏转26°左右夹角的区域且呈现出V型冲蚀形貌，这种现象是由于弯管处独特的颗粒运动轨迹决定的；在弯管沿流动方向60°～80°夹角范围内出现沟槽状冲蚀形貌，它是由于颗粒在弯管内的二次及多次碰撞。更多还原

【Abstract】 This paper is intended for the study of a right-angle flexible elbow with a large bending diameter ratio.A numerical simulation on the erosion characteristics of gas-solid two-phase flow in the elbow is conducted employing the Fluent simulation software package, in which such factors as gas inlet velocity, mass flow rate of entrained solid particles, elbow ribs and bending diameter ratio under different working cases are considered based on the discrete phase model and the General erosion model.The results show that the velocity distribution of the gas-solid two-phase flow field in the longitudinal section of the elbow is separated.The maximum erosion rate of elbow varies exponentially with the increase of the gas inlet velocity, and linearly with the increase of the particle mass flow rate.As the number of ribs embedded in the inner wall of elbow increases, the erosion ratio firstly decreases and then slightly increases and finally stabilizes.The strength of the secondary flow in the large bend is smaller than that in the elbow, and the erosion resistance of the elbow improves to a certain extent due to the existence of ribs.The severely eroded area in the elbow occurs in the area where the elbow deflects along the flow direction at an angle of about 26° and presents V-shaped erosion morphology, which is caused by the special particle movement trajectory at the elbow.The groove-like erosion morphology appears within the angle range of 60°-80° along the flow direction, which is due to the secondary and multiple collisions of particles in the elbow.更多还原