窄通道自然循环ONB点影响因素的关联度研究
首发时间:2010-04-12
摘要:采用反映系统序列间正、负相关性的灰色关联度模型,对影响自然循环ONB点发生的相关因素进行了计算。在所选参数范围内:加热量、质量流量和压力与ONB起始点位置呈负相关性,三因素的增加会促进ONB点发生,且加热量为主导因素;而窄缝间隙与ONB起始热流密度会呈弱正相关性,其增加会推迟ONB点发生。该结论可为进一步分析自然循环ONB点的发生机理创造条件,为反应堆的安全分析奠定理论基础。
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Correlation Degree Study of Influence Factors on Natural circulation ONB in Narrow channel
Abstract:Grey correlation degree calculation model which reflects the positive and negative relation of sequences is applied to calculate relevant influence factors on natural circulation ONB (Onset of Nucleate Boiling) in narrow channel. In the range of selected parameters: heat flux, mass flow and pressure show negative correlations with the distance between ONB and channel inlet, which prove that these three factors promote ONB occurrence. Besides, heat flux is a dominant factor. And a weak positive correlation exists between the narrow channel gap and inception heat flux at the location of ONB. The occurrence of ONB will be postponed as the value of channel gap becomes bigger. The conclusion can create conditions for further analysis of occurrence mechanism of natural circulation ONB. Thus the theoretical foundation for the safety analysis of nuclear reactor can be also established.
Keywords: Narrow channel Natural circulation ONB Grey correlation degree
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