上海交通大学学报

上海交通大学学报（自然版） ›› 2012, Vol. 46 ›› Issue (04): 524-529.

• 能源与动力工程 • 上一篇    下一篇

加热通道内超临界流动的稳定性分析——时域分析

侯东，刘鹏飞，林萌，杨燕华   

  1. （上海交通大学 机械与动力工程学院， 上海 200240）
  • 收稿日期:2011-04-04 出版日期:2012-04-28 发布日期:2012-04-28
  • 基金资助:

    国家重点基础研究发展规划（973）项目（2007CB209806）

The Flow Stability Analysis of Supercritical Fluid in Heated Pipes：Time Domain Analysis

 HOU  Dong, LIU  Peng-Fei, LIN  Meng, YANG  Yan-Hua   

  1. (School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2011-04-04 Online:2012-04-28 Published:2012-04-28

摘要：  详细描述了超临界流体流动稳定性分析的时域法模型.利用该模型针对加热通道内超临界水的流动进行了瞬态模拟分析，并给出了系统质量流率随时间变化和系统进出口质量流率在相平面中的运动轨迹曲线.考察了在采用频域法得到的对数衰减率（LDR）接近0时的系统稳定性特征，得出了系统在该状态下处于极限环稳定状态的结论.通过阶跃变加热功率的瞬态模拟，证明了系统在高焓值情况下稳定性振荡现象的存在.通过时域法计算得到的结论与频域法是一致的，但时域法能更好地进行流动稳定性的非线性特性分析.

关键词: 时域法, 流动稳定性, 超临界

Abstract: The time domain model for stability analysis of flow dynamics with supercritical fluid was described. With the model the dynamic behaviors of supercritical water flowing in heated pipes were studied. The mass flow fluxes versus time were given out, and the portraits of system inlet and outlet mass fluxes were plotted in the phase plane. The stability characteristics of system when the logarithmic decay ratios (LDRs) are very close to zero were checked out, and the results show that the system has stable limit cycles with nearzero LDRs. Through transient simulations with jumping heating powers the stability oscillations of system of high outlet enthalpies were observed. The frequency domain analysis and time domain analysis are consistent with each other. However, the latter method can provide better analysis of the nonlinear characteristics of fluid flow.

Key words:  time domain model, flow stability, supercritical

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