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首页> 外文期刊>Annals of nuclear energy >A study on the density wave oscillation relative stability turning point of uniform and cosine heat flux profiles in parallel channels
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A study on the density wave oscillation relative stability turning point of uniform and cosine heat flux profiles in parallel channels

机译：平行通道内均匀和余弦热通量分布的密度波振荡相对稳定性拐点研究

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摘要

Existing studies have shown that heat flux profile is a key parameter influencing the system stability boundary, and in practical systems, heat flux profile along the flow channel can be very complex and would change with operation conditions. For the stability analysis of a certain system, instead of obtaining all the stability boundaries under various heat flux profiles, it may be more wise to find the stability boundary of the most conservative heat flux profiles, and in this case it is important to have a knowledge of the relative stability turning point (RSTP) of given profiles. In this paper we performed a study on the properties of parallel channel density wave oscillation (DWO) RSTP of two given heat flux profiles, mainly based on the most studied uniform and cosine profiles. A lot of different operation conditions were calculated to find the effects of operation parameters including inlet resistance coefficient, outlet resistance coefficient, mass flow and pressure on RSTP and to obtain the properties of RSTP characteristics of the profiles. Results showed that RSTP in the Nsub-Npch plane can change with inlet resistance coefficient, outlet resistance coefficient and mass flow, but the pressure effect may be ignorable. For zero outlet resistance coefficient, RSTP of the profiles studied in our paper would almost follow a constant ratio of the subcooling number (Nsub) and phase change number (Npch), and this can be used to determine the relative stability of the profiles conveniently. Also, it was found that outlet resistance coefficient increase would reduce the value of Nsub/Npch and the single phase length ratio difference of the profiles at RSTP. (C) 2018 Elsevier Ltd. All rights reserved.
机译：现有研究表明，热通量分布图是影响系统稳定性边界的关键参数，在实际系统中，沿流道的热通量分布图可能非常复杂，并且会随运行条件而变化。对于某个系统的稳定性分析，找到所有最保守的热通量分布图的稳定性边界可能更明智，而不是获取各种热通量分布图下的所有稳定性边界，在这种情况下，重要的是了解给定轮廓的相对稳定性转折点（RSTP）。在本文中，我们对两个给定的热通量分布图的平行通道密度波振荡（DWO）RSTP的性质进行了研究，主要是基于研究最多的均匀和余弦分布图。计算了许多不同的运行条件，以发现运行参数（包括入口阻力系数，出口阻力系数，质量流量和压力）对RSTP的影响，并获得轮廓的RSTP特性。结果表明，Nsub-Npch平面内的RSTP随入口阻力系数，出口阻力系数和质量流量而变化，但压力效应可忽略不计。对于零出口电阻系数，本文研究的轮廓的RSTP几乎遵循过冷值（Nsub）和相变数（Npch）的恒定比率，这可用于方便地确定轮廓的相对稳定性。而且，发现出口电阻系数的增加将减小Nsub / Npch的值以及RSTP处的分布图的单相长度比差异。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Annals of nuclear energy》 |2019年第5期|111-119|共9页
  • 作者

    Ma Zaiyong; Zhang Luteng; Sun Wan; Bu Shanshan; Pan Liangming;

  • 作者单位

    Chongqing Univ, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;

    Chongqing Univ, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;

    Chongqing Univ, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;

    Chongqing Univ, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;

    Chongqing Univ, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Density wave oscillation; Relative stability turning point; Heat flux profile effect; Parameter effect;

    机译：密度波振荡;相对稳定性转折点;热通量剖面效应;参数效应;

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