摘要
基于LS-DYNA软件,建立淹没水射流破碎天然气水合物沉积物的拉格朗日-欧拉流固耦合模型,分析射流速度、喷嘴直径和喷嘴间距等对组合射流破碎结果的影响。基于自主研制的水合物替代试样以及相关试验装置,进行淹没水射流破碎天然气水合物沉积物的试验,通过三维扫描仪得到破碎坑形貌,测量了破碎坑尺寸。研究发现:增加射流速度可有效提高射流破碎效率,喷嘴直径对射流破碎坑直径影响明显。对比喷嘴直径为3 mm和4 mm以及4 mm和5 mm射流形成的破碎坑宽度,分别增大了111.66%和123.63%;当射流速度与喷嘴直径一定,喷嘴间距在17~51 mm之间增加时,破碎坑体积先增大后减小,且存在一个最优间距;减小喷嘴直径会增加节流压耗,直径过小还会导致设备精度和寿命降低;射流采掘工具未旋转时产生的射流破碎坑会降低破碎效率和破碎坑壁面的稳定性。这项研究为组合喷嘴射流破碎水合物沉积物提供了参考和依据。
To improve the efficiency of crushing and mining hydrate by combined nozzle jet,and accelerate the commercialization of marine hydrate mining,the law of submerged water jet crushing gas hydrate deposits under different process parameters was explored.Based on software LS-DYNA a Lagrangian-Eulerian fluidsolid coupled model was established for submerged water jets breaking up natural gas hydrate deposits,and the effect of the jet velocity,nozzle diameter,and nozzle spacing on the combined jet breaking was analyzed.Based on the self-developed hydrate surrogate sample and corresponding test equipment,a crushing test of natural gas hydrate deposits by submerged water jet was carried out.The shape of the crushing pit was observed with a three-dimensional scanner,and the size of the crushing pit was measured by an instrument.Through the numerical simulation and outdoor test results,it is found that the jet crushing efficiency can be effectively improved by increasing the jet velocity,and the diameter of the nozzle has a significant impact on the diameter of the crushed pit.The width of a crushing pit is increased by 111.66%and 123.63%respectively,when the nozzle spacing increases between 17 mm and 51mm.The volume of the crushing pit first increases and then decreases,and there is optimal spacing.A decrease in the nozzle diameter will increase pressure loss at the throat,and too small nozzle diameter will reduce the accuracy and life of the equipment.This study will provide a reference and basis for combined nozzle jet breaking up hydrate deposits.
作者
冯清
王国荣
钟林
张林锋
王党飞
刘小平
FENG Qing;WANG Guorong;ZHONG Lin;ZHANG Linfeng;WANG Dangfei;LIU Xiaoping(College of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《中国造船》
EI
CSCD
北大核心
2023年第4期106-119,共14页
Shipbuilding of China
关键词
淹没水射流
非成岩水合物
组合喷嘴
数值模拟
试验
破碎坑
submerged water jets
non-diagenetic hydrates
combined nozzle
numerical simulation
testing
crushed pits
