A Study On Fluid-solid Coupling Characteristics Of Pipes In Hydraulic With Different Curvatures

Hydraulic pipes as an important part of the hydraulic system is a primary means of power transmission. Hydraulic system is widely used in many industries. Dynamic performance of pipelines is closely related with the hydraulic piping system and its associated equipment. The study of hydraulic piping system dynamics has simple model and its mechanical characteristics are obvious. It is one of hot topics of long-term research of computational mechanics and soli d mechanics. Hydraulic pipes with different curvatures are research object of this study. Finite element software is used to have a further study on fluid-solid coupling characteristic of hydraulic pipes with different curvatures. At the same time, the experiment schemes of hydraulic pipes with different bending angles are designed on the basis of simulation. The feasibility of simulation results is verified by experiments. Thus, it has great practical significance for improve the reliability of pipelines a nd provide a reference for pipeline design from the perspective of controlling the curvature layout of hydraulic pipelines so as to lower the effect of fluid-solid coupling to pipes. The main research works include:a) It has an analysis on basic theories about fluid-solid coupling of hydraulic pipelines.The dynamic model of fluid-solid coupling on hydraulic pipeline is established by using the theorem of fluid momentum.b) It has a finite element simulation analysis for fluid-solid coupling of hydraulic pipelines. It has a fluid-solid coupling simulation analysis of pipes with different bending radii and angles and has a discussion about the changing rule of fluid and solid in pipes with the change of curvatures of pipes, which considers the effect of hydraulic pipes’ diameters and pipes’ curvatures on natural frequencies. It suggests that the pipe model is more reasonable when the R/D of hydraulic bending pipe is 1.5. It provides reference for the transient simulation analysis and experimental research of hydraulic pipes.c) It has a fluid-solid coupling analysis of hydraulic pipeline transient dynamics. It studies the changing rule of hydraulic pipelines under pulsating flow situation with piping curvature variations. The monitoring points on the edge of t he outer wall of pipes are set. It has a further study of the changing rule of pipes’ deformation at monitoring points and stress with the change of pipelines’ curvatures.d) It designs the experimental study plan of hydraulic pipes with different bending angles combining with fluid-solid coupling analysis of hydraulic pipelines with steady state and transient state. It compares experimental data and analyzes results to verify the feasibility of simulation results. It provides some reference for the design and optimize layout of hydraulic pipes.