波纹夹层防爆墙在油气燃爆冲击下的动态响应

Dynamic Response of the Corrugated Sandwich Blast Wall under the Gas Explosion

防爆墙结构是海上浮式生产储油船(FPSO)上部重要防护设施,其在油气燃爆冲击下的动态响应需要重点关注。以FPSO上部模块为研究对象,基于计算流体力学(CFD)方法对油气燃爆场景进行数值模拟,获得了防爆墙表面压力时间曲线和空间分布;基于显式动态算法研究了波纹夹层防爆墙在燃爆载荷作用下的动态响应,并与等质量加筋板动态响应进行对比。研究结果表明:在防爆墙动态响应研究时,加载考虑负压和压力非均匀分布会使结果更准确,相比于加载平面内分布均匀的三角形载荷,考虑时间上负压阶段进行加载时,波纹夹层防爆墙永久变形减小;考虑超压空间非均匀分布进行加载时,波纹夹层防爆墙永久变形增大;考虑压力非均匀分布进行加载时,波纹夹层防爆墙永久变形要比加筋板小25.8%,抗爆性能更优。研究结论可为FPSO上部防爆墙设计及动态响应研究提供一定的参考。

Blast wall is an important protective facility in the upper part of the floating production storage and offloading(FPSO), and its dynamic response under the impact of gas explosion needs to be paid more attention.Taking the upper part of the FPSO as the research object, numerical simulation of oil and gas explosion scene is carried out based on the computational fluid dynamics(CFD) method, and the surface pressure time curve and spatial distribution of blast wall is obtained. Based on the explicit dynamic algorithm, the dynamic response of corrugated sandwich blast wall under explosion load is studied and compared with that of equal mass stiffened plate.The results show that: in the study of dynamic response of blast wall, considering negative pressure and non-uniform distribution of pressure can make the results more accurate. Compared with the triangle load with uniform distribution in the loading plane, the permanent deformation of corrugated sandwich blast wall is reduced when considering negative pressure stage in time;considering the non-uniform distribution of overpressure, the permanent deformation of the corrugated sandwich wall increases. Considering the non-uniform distribution of pressure, the permanent deformation of corrugated sandwich blast wall is 25.8% smaller than that of stiffened plate and the anti explosion performance is better. The research work and relevant conclusions can provide some references for the design and dynamic response research of the upper blast wall of the FPSO.