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首页> 外文期刊>International Journal of Heat and Mass Transfer >POD based modeling on flow and heat transfer of air-cooled condenser influenced by natural wind
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POD based modeling on flow and heat transfer of air-cooled condenser influenced by natural wind

机译：基于POD的自然风影响下风冷冷凝器的流动和传热建模

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摘要

Numerous factors, including the meteorological and the geographical conditions as well as the configurations of the fin tube bundles, can affect the performance of an air-cooled condenser (ACC) in a power generating unit. In this work a new model is presented to rapidly and accurately predict the flow and heat transfer characteristics of an ACC under the influence of natural wind. This reduced-order model is based on proper orthogonal decomposition (POD) of the three-dimensional velocity and temperature fields and encompasses natural wind directions ranging from 0° to 90°. In the process of operation in the present paper, a combined procedure involving spare and complementary POD is formulated to treat the issue of high nonlinearity associated with the large variable gradients which generate vortices around the ACC. A flux matching procedure is also introduced for estimation of the weight coefficients of the POD modes. The velocity and temperature fields of four typical test cases were estimated with maximum relative errors of 1.75% and 0.19%, respectively. At the same time, the degree of freedom was reduced by 10~5 compared to calculations made using computational fluid dynamics. The present research may provide a new and more reliable approach to real-time operational control of ACCs in power plants under polytrop-ic natural wind conditions.
机译：包括气象和地理条件以及翅片管束的配置在内的许多因素都可能影响发电单元中风冷冷凝器（ACC）的性能。在这项工作中，提出了一个新模型来快速准确地预测自然风影响下ACC的流动和传热特性。此降阶模型基于三维速度和温度场的适当正交分解（POD），并涵盖了从0°到90°的自然风向。在本文的操作过程中，制定了包含备用POD和互补POD的组合程序，以处理与在ACC周围产生涡旋的大可变梯度相关的高非线性问题。还引入了通量匹配过程来估计POD模式的权重系数。估计四个典型测试案例的速度和温度场，最大相对误差分别为1.75％和0.19％。同时，与使用计算流体动力学进行的计算相比，自由度降低了10〜5。本研究可为多向性自然风条件下电厂ACC的实时运行控制提供一种新的，更可靠的方法。

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  • 来源
  • 作者

    Hemin Hu; Xiaoze Du; Lijun Yang; Yongping Yang;

  • 作者单位

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Beijing 102206, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Flow and heat transfer; Air-cooled condenser; Reduced-order model; Proper orthogonal decomposition;

    机译：流动与传热;风冷冷凝器;降阶模型;适当的正交分解;

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