Subjects: Mechanics >> Basic Mechanics submitted time 2023-04-24 Cooperative journals: 《应用力学学报》
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.
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