流速比对反向流动中射流流动特性的影响研究

应用超声多普勒测速技术,对不同流速比下反向流动水体中单圆管排放的射流特性进行了水槽模拟实验。介绍了实验装置和量测技术。分析了反向流动水体中射流的流动特征。获得了不同流速比下射流轴线流速的沿程衰减规律,以及流速比对射流轴线流速、射流扩展半宽度、平均最大射流长度和最大射流宽度等特征参数的影响,并与已有的研究成果进行了对比。实验研究成果对潮汐水域城市污水的水下处置等有着重要的实际意义和参考价值。

Effects of Velocity Ratios on Characteristics of Jets in Counter-Flowing Stream

Using Acoustic Doppler Velocimeter (ADV) instruments, the characteristics of velocity fields of single round jet at different velocity ratios in counterflow water stream have been studied through experiments in flume. In this paper, the experimental equipment and measurement techniques were introduced, the flowing characteristics were analyzed, and the decay of centerline velocity of jets at different valocity ratios was acquired also. The effect of velocity ratio on the jet characteristic parameters, such as variation of centreline velocity, the half-jet-width, and the mean maximum penetration depth and width, was gained and also compared with the existing results. The results of this paper are practical and can be referred for the pollutant discharging engineering in the tidal area and the other fields.