Static Analysis And Verification Of Flexible Riser For Underwater Compressed Air Energy Storage System

Underwater compressed air energy storage(UCAES)is a new flexible large-scale energy storage technology,which is suitable for coastal cities,islands and offshore platforms.In the underwater compressed air energy storage system,the flexible riser delivers the compressed air to the underwater accumulator to ensure the safe delivery of high-pressure gas in the system and the stable operation of the system.In order to study the mechanical properties of flexible riser,the main contents of this paper are as follows.In this paper,the structural parameters of the flexible riser are calculated based on a hypothetical index of the underwater compressed air energy storage system and the design specification of the flexible riser.The simulation model of flexible riser in Orcaflex is established:catenary type and slow wave type.The static/dynamic mechanical and morphological characteristics of catenary riser and slow-wave riser under different environmental eonditions and air pressure were analyzed,and the overall response characteristics of the flexible riser were obtained.The sensitivity analysis of the main factors affecting the slow-wave riser is carried out,including the length of the buoy section,starting position,volume and other factors,and the influence degree of different factors on the flexible riser line,tension and curvature is compared and analyzed,which provides a reference for the design of the flexible riser line.Based on the nonlinear mechanics of elastic thin rods,the static model of flexible riser is established.With the help of finite element discretization and difference method,the static model results are compared with the ocean engineering software Orcaflex simulation results under different boundary conditions.The average error is 9.3%,indicating the rationality of the static model.Based on the basic similarity theory of model experiments,the similarity experiments were carried out.The average error of the static model was 2.9%smaller than that of the software simulation through the verification of three different boundary conditions.The static model was compared with the software simulation to solve the static characteristics of the flexible riser.More accurate.The static model helps to calculate the mechanical properties of the flexible riser,check the strength of the flexible riser,and avoid the flexible riser in the underwater compressed air energy storage system from breaking due to excessive load,reducing economic losses.