摇摆对矩形窄通道内单相水流动特性的影响

常温常压下,实验研究摇摆对矩形窄通道内单相水流动特性的影响。结果表明,驱动压头较低时,雷诺数及摩阻系数呈周期性波动,摇摆越剧烈,波动幅度越大;驱动压头较高时,雷诺数周期性波动不明显,摩阻系数波动幅度减小。出口通大气的实验段,摇摆振幅对摩阻系数波动幅值及波形均有影响,摇摆周期只影响摩阻系数波动幅值。摇摆运动对流动特性的影响随雷诺数的增加而减弱。摇摆对矩形窄通道内单相水平均摩阻特性没有明显影响。

Effect of Rolling on Characteristics of Single-Phase Water Flow in Narrow Rectangular Channel

Effect of rolling on characteristics of single-phase flow in narrow rectangular channel is in-vestigated experimentally under ambient temperature and atmospheric pressure.The results show that the frictional coefficient and Reynolds number fluctuate periodically when driven pressure head is low,and the more acute the rolling movement,the larger the fluctuant amplitude.When the driven pressure head is high,periodical fluctuate of Reynolds numbers is not obvious,and the amplitude of the friction coefficient fluctua-tion becomes smaller.For the case that test sections with outlet open to atmosphere,the rolling amplitude not only influences the fluctuant amplitude of the friction coefficient but also changes its waveform.The rolling period only has effect on the amplitude.The effect of rolling on the friction characteristics decreases as the mean Reynolds number increases.There is no obvious effect of rolling motions on the mean frictional char-acteristics of the single-phase water flow in narrow rectangular channel.