周期性力场作用下窄通道内两相流压降特性

通过实验研究了摇摆造成的周期性附加惯性力作用下矩形窄通道内空气 水两相流压降特性。按分液相雷诺数将流动分为层流区（Re_f <800）、过渡区（800≤Re_f≤1 400）及湍流区（Re_f >1 400）3个区域，并对各区域内附加压降、重位压降和摩擦压降平均值及瞬态值进行了比较。结果表明，附加惯性力对窄通道内两相流整数倍周期内平均摩擦阻力无明显影响。周期性附加惯性力作用下(摇摆周期16 s，摇摆振幅30°)，层流区及过渡区气相表观速度、液相表观速度、质量含气率及摩擦压降随时间周期性波动，波动周期等于摇摆运动周期；瞬时摩擦压降相对于其平均值的波动幅值随气液两相流速的增加而减小。湍流区两相流动参数周期性波动不明显。

Investigation on Characteristics of Two-Phase Flow Pressure Drop in Narrow Channel Subject to Periodical Force

Characteristics of air-water two-phase flow pressure drop in narrow rectangular channel subjected to periodical additional inertia force caused by rolling motion were investigated experimentally. Time averaged and transient additional pressure drop, gravitational pressure drop and frictional pressure drop were compared in three different flow regions, namely, laminar flow region (Re_f<800), transition flow region (800≤Re_f≤1 400) and turbulent flow region (Re_f >1 400). The results show that additional inertial force nearly has no influence on time-averaged frictional pressure drop in multiple rolling periods. Under periodical force condition (rolling period 16 s; rolling amplitude 30°), the superficial gas and liquid velocity, mass quality and frictional pressure drop fluctuate with the same periods of rolling motion, and the fluctuation amplitude of transient frictional pressure drop against its averaged value decrease as the gas and liquid velocity increase both in laminar and transition flow region. For the case in turbulent flow region, two-phase flow parameters have no evident periodical oscillation.