摘要
对于液货舱内液化天然气(LNG)由于密度差和漏热引起的分层和翻滚现象,基于VOF模型以及boussinesq假设建立了舱内LNG翻滚过程的控制方程,并利用大型商用软件FLUENT对翻滚过程进行数值模拟。研究表明,LNG由于密度差引起的分层是翻滚的根本原因;在液—液分界面附近,由于漏热会使得密度趋向一致,引起掺混,舱内一旦发生翻滚,将会使舱内下层过热LNG急剧蒸发,从而会引起舱内压力迅速增大,引发超压事故。为了提高LNG的储存效率以及海上运输的安全性,结合模拟结果提出预防翻滚的几点建议。
For the layering and rolling of liquefied natural gas under density differential and heat leakage in liquid cargo tank, established the control equations of the LNG rolling and simulated the progress of LNG rolling evolution by FLUENT, based on VOF model and boussinesq hypothesis. Research showed that the root cause of rolling for LNG was the layering due to density differential. In liquid-liquid boundary near the surface, the density would trend consistent due to heat leakage, once there was rolling in the liquid cargo tank, the superheated LNG would evaporate rapidly, and this could cause the tank pressure increase rapid- ly, finally caused some overpressure accidents.In order to improve the storage efficiency and the safety of LNG transportation, some suggestions were given to prevent rolling according to the simulated results.
出处
《交通节能与环保》
2013年第1期41-45,50,共6页
Transport Energy Conservation & Environmental Protection
基金
上海市教委科研创新项目(09ZZ161)
上海市教委重点学科资助项目(J50603)
关键词
船舶运输
液化天然气
翻滚
数值模拟
ship transportation
LNG
rolling
numerical simulation
