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Near-Critical Natural Circulation Flows Inside an Experimental Loop: Stability Map and Heat Transfer

机译：实验回路内的近临界自然循环流：稳定性图和热传递

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摘要

The near-critical CO_2 -based natural circulation loop (NCL, or thermosyphon) has been proposed in many energy conversion systems, such as the solar heater, waste heat recovery, next-generation nuclear cooling, and so on. There is an increasing need to obtain detailed information about such systems, as it is less verified from a basic system operation viewpoint. This paper presents an experimental investigation of a near-critical CO_2 thermosyphon. The closed thermosyphon is specially designed for high-pressure (in the critical region, from 6.0 MPa to 15.0 MPa), natural circulation flows. The basic transient flow behaviors and parameter behaviors are found to be dependent on initial pressure. The system stability evolution from subcritical oscillating flow to supercritical stable operations is presented. From the experimental data analysis, the stability map for the current supercritical natural circulation loop system is given. It is found that the stability pressure lines will divide the operation into stable, transition, and unstable regions. It is found that the effectiveness of the cooler will greatly affect the system stability, while the heat transfer efficiency is mainly controlled by the heater conditions. Parameter evolutions of the fluid temperature, mass flow rate, and loop pressure are presented in this paper. The heat transfer dependency on operation pressure and evolution mechanisms are also discussed in detail in this paper.
机译：在许多能量转换系统中，例如太阳能加热器，废热回收，下一代核冷却等，已经提出了基于近临界CO_2的自然循环回路（NCL，或热虹吸管）。越来越需要获得有关此类系统的详细信息，因为从基本系统操作的角度来看，这种信息很少得到验证。本文介绍了近临界CO_2热虹吸管的实验研究。封闭式热虹吸管是专门为高压（在关键区域，从6.0 MPa到15.0 MPa）自然循环流动而设计的。发现基本的瞬态流动特性和参数特性取决于初始压力。提出了从亚临界振荡流到超临界稳定运行的系统稳定性演化。通过实验数据分析，给出了当前超临界自然循环回路系统的稳定性图。已发现，稳定压力线会将操作分为稳定，过渡和不稳定区域。发现冷却器的有效性将极大地影响系统稳定性，而热传递效率主要由加热器条件控制。本文介绍了流体温度，质量流量和回路压力的参数演变。本文还详细讨论了传热对工作压力和析出机理的依赖性。

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  • 来源
    《Heat Transfer Engineering》 |2016年第4期|302-313|共12页
  • 作者

    LIN CHEN; XIN-RONG ZHANG; BI-LI DENG;

  • 作者单位

    Department of Energy and Resources Engineering, Peking University, Beijing, China;

    Department of Energy and Resources Engineering, Peking University, Chengfu Road No. 298, HaiDian District, Beijing 100871, China;

    Department of Energy and Resources Engineering, Peking University, Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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