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中文摘要：
通过实验研究了摇摆运动对矩形窄通道内单相水摩擦阻力特性的影响。结果表明摇摆条件下摩擦压降呈周期性波动，波动幅值随雷诺数的增加而减小，随摇摆振幅的增加而增大，随摇摆周期变化不明显。摇摆对单相水平均摩阻特性没有明显影响。摇摆运动对瞬时摩擦压降波动特性的影响表现在两个方面：一方面摇摆造成回路流量波动进而导致摩擦压降波动；另一方面摇摆引起实验段近壁区质点受力周期性变化从而引起摩擦压降微小波动。通过实验数据拟合得到了摇摆条件下层流瞬时摩阻系数计算经验关系式。
英文摘要：
Effects of rolling motion on frictional resistance characteristics of single-phase wa- ter flow in narrow rectangular channel are investigated experimentally. The results show that the frictional pressure drops under rolling condition fluctuates periodically, and its amplitude decrea- ses as Reynolds number increases and increases as the rolling amplitude increases, but doesn＇t vary evidently with rolling period. Rolling motion has insignificant influence on time-averaged frictional resistance of single-phase flow. Rolling motion influences the fluctuation amplitude of frictional pressure drop in two aspects： on the one hand, periodical pulsing flow reduced by roll- ing leads to the fluctuation of the frictional pressure drop; on the other hand, additional force act- ing on fluid near the wall due to the rolling motion makes local frictional resistance oscillate peri- odically. A new correlation applied to calculate instantaneous frictional coefficient under rolling condition in laminar flow region is obtained by fitting experimental data.
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