Development of mechanistic boiling two-phase flow analysis methods for the design of high-power density light water reactors

高功率密度轻水堆设计机械沸腾两相流分析方法的发展

• 批准号: 20360419
• 负责人: OKAWA Tomio
• 金额: $ 12.23万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20360419/
• 关键词: 沸騰流; 気液二相流; 限界熱流束; ボイド率; ドライアウト; 流量振動; 非線形波動理論; 気泡挙動; 強制対流沸騰; 液膜ドライアウト; サブクール沸騰; 濡れ性; 相変化伝熱; 不安定; 表面濡れ性

In high-power-density tight-lattice LWRs, margin to the onset of flow instability is reduced comparing with conventional ones. The mechanisms of the transition to the CHF condition under flow oscillation conditions were hence investigated theoretically, numerically, and experimentally. It was revealed that the nonlinear wave theory can be applied to the prediction of CHF in this situation. Void fraction in subcooled boiling region is of importance in evaluating the hydraulic stability and fuel burn-up. It was demonstrated that heat transfer enhancement by sliding bubbles and bubble coalescence play important roles in determining the axial development of the void fraction.

在高功率密度紧晶格轻水反应堆中，与传统的轻水反应堆相比，流动不稳定的起始裕度减小了。因此，本文从理论、数值和实验三个方面研究了在流动振荡条件下向CHF条件转变的机理。结果表明，在这种情况下，非线性波动理论可以应用于CHF的预测。过冷沸腾区的含气率是评价水力稳定性和燃料燃耗的重要指标。结果表明，滑移气泡强化换热和气泡合并对空泡率的轴向发展起着重要的作用。

项目成果

Variation of Critical Heat Flux by Flow Oscillation in a Small Vertical Channel

• DOI: 10.1115/icone17-75147
• 发表时间: 2009
• 作者: Toshihiro Murakami;Rei Takei;T. Okawa

ナノフルイドによる伝熱面改質時間に関する実験的検討

纳米流体传热表面改性时间实验研究

• 发表时间: 2009
• 作者: 大川富雄;神谷崇仁
• 通讯作者: 神谷崇仁

Experimental Study on Liquid Film Dryout Under Oscillatory Flow Conditions

• DOI: 10.1115/icone17-75400
• 发表时间: 2009
• 作者: Yosuke Yamagoe;T. Goto;T. Okawa

流量振動下における液膜ドライアウト予測モデルの開発

流量振荡下液膜干燥预测模型的开发

• 发表时间: 2010
• 作者: 大川富雄;村上寿浩
• 通讯作者: 村上寿浩

Liquid film behavior in annular two-phase flow under flow oscillation conditions

• DOI: 10.1016/j.ijheatmasstransfer.2009.11.024
• 发表时间: 2010-02
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: T. Okawa;T. Goto;Yosuke Yamagoe