Visualizing an ignition process of hydrogen jets containing sodium mist by high-speed imaging

土井 大輔; 清野 裕; 宮原 信哉*; 宇埜 正美*

Journal of Nuclear Science and Technology, 56(6), p.521 - 532, 2019/06

https://doi.org/10.1080/00223131.2019.1599743

In severe accident scenarios for sodium-cooled fast reactors, it is desirable to gradually consume hydrogen generated by various ex-vessel phenomena without posting a challenge to containment integrity. An effective means is combustion of hydrogen jets containing sodium vapor and mist, but previous studies have been limited to determining ignition thresholds experimentally. The aim of this study was to visualize the ignition process in detail to investigate the ignition mechanism of hydrogen-sodium mixed jets. The ignition experiments of the hydrogen jet containing sodium mist were carried out under a condition of little turbulence. The ignition process was measured with an optical measurement system comprised of a high-speed camera and an image intensifier, and a spatial distribution of luminance was analyzed by image processing. Detail observation revealed that sodium mist particles burned as scattering sparks inside the jet and that hydrogen ignited around the mist particles. Additionally, the experimental results and a simple heat balance calculation indicated that the combustion heat of sodium mist particles could ignite the hydrogen as the heterogeneous ignition source in the fuel temperature range where the mist particle formation was promoted.

平成5年度JRR-3M中性子ラジオグラフィ研究会報文集; 1994年2月34日、東海村

研究炉部

JAERI-Conf 95-006, 207 Pages, 1995/03

JAERI-Conf-95-006.pdf:9.47MB

本報文集は平成5年度JRR-3M中性子ラジオグラフィ研究会において行われた講演を基に、それぞれの研究者が執筆した論文を収録したものである。本研究会は平成6年2月3、4日に開催された。研究発表16件、参加者46名であった。今回の研究会の特徴は研究発表の増加とともに新分野における応用の提案、および中性子ラジオグラフィ技術への新たな試みがなされたことである。外国における中性子ラジオグラフィの研究が2件紹介された。また、特別講演も1件招待した。