摘要
为揭示不同驱动压头下摇摆运动对单相流动特性的影响机理,对摇摆条件下矩形通道内单相水层流阻力特性进行了理论和实验研究.实验结果表明,摇摆条件下流量波动幅值随驱动压头增加而迅速减小,当驱动压头大于附加压降幅值的10～11倍时,流动最终趋于稳定.驱动压头较低时,摇摆条件下瞬时摩擦压降与流量存在相位差,且不能采用稳态关系式预测.驱动压头较高时,摇摆条件下瞬时摩擦压降不波动,可采用稳态关系式计算.通过分析速度分布,解释了不同驱动压头下摇摆运动对矩形通道内单相强迫循环摩擦阻力特性的影响机理.
In order to reveal the effect mechanism of rolling motion on single-phase flow behaviors with different pressure heads,this paper investigated experimentally and theoretically characteristics of laminar flow resistance for single-phase flow in rectangular duct.The experimental results indicate that the fluctuation amplitude of flow rate in rolling motion decreases rapidly as the pressure head increases.Further more,the flow tends to be steady as the pressure head increases to higher than 10~11 times the amplitude of the additional pressure drop.As the pressure head lowers,the transient frictional pressure drop in rolling motion fluctuates unsynchronized with the flow rate,and could not be predicted by steady-state correlations.However,in the case of high pressure head,the transient frictional pressure drop is nearly invariable,and could be calculated by steady-state correlations.The mechanism of effects of rolling motion on single-phase laminar flow for forced circulation in rectangular duct with different pressure heads was clarified by analyzing the velocity distribution.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2013年第4期450-454,共5页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(11175050
51076034)
关键词
摇摆运动
单相层流
强制循环
摩擦阻力
驱动压头
rolling motion
single-phase laminar flow
forced circulation
frictional resistance
pressure head
