分体式沉积物取样器锥阀闭合过程缝隙流体的瞬态特性分析
Transient Characteristics Analysis of Gap Fluid During Conical Valve Closure in Split Sediment Sampler
江山强 1万步炎 1彭佑多 1金永平 1刘广平1
作者信息
- 1. 湖南科技大学海洋矿产资源探采装备与安全技术国家地方联合工程实验室,湖南湘潭 411201
- 折叠
摘要
锥阀的可靠闭合是分体式全海深沉积物取样器初始密封建立的关键,而缝隙流体的瞬态特性对锥阀可靠闭合具有重要影响.采用CFD、重叠网格、动网格的方法,建立了分体式沉积物取样器锥阀闭合过程缝隙流体的二维流动模型,数值模拟了轴向缝隙流体的瞬态特性,研究了不同闭合速率对流场特性的影响规律.结果表明:在所选的闭合速率下,锥面下侧缝隙比上侧缝隙的流动更稳定,上侧缝隙则更容易形成湍流;随着闭合速率的减小,瞬态流体阻力所做负功接近阈值,锥面间流体所受的剪切作用变弱;为了减小波动、减小阻力所做负功、提高闭合的效率,选择闭合速率在0.005 m/s到0.001 m/s之间较为合适.所做研究可为提高分体式全海深沉积物取样器的初始密封提供重要参考.
Abstract
The reliable closure of a conical valve is key to establishing the initial seal of a deep-sea split sediment sampler.The transient characteristics of gap fluid have an important effect on the reliable closure of the conical valve.By using CFD,overlapping mesh and moving mesh methods,a two-dimensional flow model of the gap fluid in the split sediment sampler was established.On this basis,the transient characteristics of axial gap fluid were simulated numerically,and the influence of different closure rates on the flow characteristics between conical surfaces was studied.The simulation results show that at the selected closure rate,the flow in the lower gap of the conical valve is more.stable than that in the upper gap and that turbulence forms more easily in the upper gap.With the decrease of the closure rate,the negative work of transient fluid resistance approaches the threshold,and the shear action of the inter-cone fluid becomes weaker.In order to reduce the fluctuation,the paper reduces the negative work done by the resistance and improves the closure efficiency.It is appropriate to choose the closure rate between 0.005 m/s and 0.001 m/s.The study provides important reference for improving the initial seal of the deep-sea split sediment sampler.
关键词
分体式沉积物取样器/锥阀/缝隙流体/瞬态特性/数值计算Key words
split sediment sampler/cone valve/gap fluid/transient characteristics/numerical calculation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据