文章摘要
张宏伟,刘之平,张东,吴一红.掺气水流声速的研究[J].水利学报,2013,44(9):
掺气水流声速的研究
Study on the sound velocity in an aerated flow
  
DOI:
中文关键词: 掺气水流  双流体模型  声速  衰减
英文关键词: aerated flow  two-fluid model  sound velocity  attenuation
基金项目:
作者单位
张宏伟 中国水利水电科学研究院北京100038 
刘之平 中国水利水电科学研究院北京100038 
张东 中国水利水电科学研究院北京100038 
吴一红 中国水利水电科学研究院北京100038 
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中文摘要:
      采用一维双流体模型,利用小扰动原理研究了压力波在水气两相泡状流中的传播规律。针对水利工程中高速掺气水流的特点,对方程进行合理模化和封闭。详细分析了掺气浓度、压力、扰动频率、相间相互作用力对掺气水流中声波传播速度和衰减的影响。结果表明,适当的掺气浓度会使掺气水流的声速显著降低;压强的减小和相间传热的增强可使声速减小、衰减加快;虚拟质量力主要影响高频声速,并使声波衰减减慢。
英文摘要:
      With a one-dimensional two-fluid model and employing the small perturbation analysis,the propagation of the pressure wave in the water-gas two-phase bubbly flow was investigated. The governing equations are simplified and closured according to high-speed aerated flow characteristics in hydraulic engineering. The effects of aerated concentration, liquid pressure, perturbation frequency and interfacial forces on the acoustic wave velocity and its attenuation in the aerated flow are explored in detail. The results show that the sound velocity of the aerated flow decreases significantly with aerated concentration; the decrease of pressure and enhancement of heat transfer can reduce sound velocity while accelerate attenuation of sound wave; the virtual mass force mainly affects high-frequency sound velocity and slows down the sound wave attenuation.
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