2444 非定常サブチャンネル解析コード NASCA の開発・改良 : (2) コード内容とスペーサー効果

概要

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Transient subcahnnel analysis code NASCA has been developed to predict boiling transition (BT) and rewetting in BWR reactors. NASCA code is based on three-fluid model, and has a liquid film-droplet model, a new spacer-induced droplet deposition model, a modified cross-flow model, fine subchannel model, etc. The spacer-induced droplet deposition model incorporating three spacer effects, such as (1) turbulent enhancement effect, (2) secondary flow effect and (3) run off effect was proposed. Predicted critical power was found to be in good agreement with existing experimental data by applying the spacer model. Moreover, it was clarified that spacers played a significant role on transient BT and rewetting phenomena.
社団法人日本機械学会の論文
2000-07-31