微肋结构对储罐失压下液化气瞬态暴沸特性的影响

沸腾液体蒸气膨胀爆炸（BLEVE）是液化气储运中的一类常见灾害，其爆炸剧烈程度取决于容器失压时亚稳态液体的过热度。为避免发生液化气爆炸，提出了一种采用微肋结构来促进过热液体成核的防制思路。通过搭建可视化的实验装置，对比观测了失压条件下光滑和微肋表面上的气泡成核过程，并测量了失压后容器内的瞬态压力曲线。结果表明，微肋表面上的成核起始时间相比光滑表面提前了50 ms；在200～500 kPa泄放压力范围下，通过采用微肋结构表面，暴沸引发的压力反弹相比光滑表面降低了24.1%，液体最大过热度下降了21.7%。

Influences of micro-fin structure on flash boiling characteristics of liquefied gas under tank depressurization

The boiling liquid expanding vapor explosion (BLEVE) is a most common hazard in liquefied gas storage and transportation, and its explosion energy depends on the superheat degree of the metastable liquid at the loss of containment. For preventing the flash boiling of liquefied gas, this paper presents a new method by using micro-fin surface to promote nucleation in superheated liquid. A visualized experimental rig is established. The nucleation process on micro-fin surface under rapid depressurization is observed and compared to that on smooth surface; the transient pressure evolution in the container is measured. The results show that the onset of nucleation on micro-fin surface is about 50 ms earlier than that on smooth surface. The adopted micro-fin surface in the experiments reduces the pressure rebound and the maximum liquid superheat degree by up to 24.1% and 21.7% respectively among the release pressures of 200-500 kPa.