摇摆运动下矩形窄通道内摩擦压降特性研究

以水为工质，进行了摇摆运动下矩形窄通道内单相与流动沸腾阻力实验，获得了摇摆运动下瞬态压降波动规律，并对摇摆运动影响压降波动的机理进行了分析。摇摆运动使摩擦压降产生周期性波动，单相流动时，随系统流量、工质温度的升高，摇摆对压降波动的影响越发减弱；流动沸腾时，摇摆运动通过改变系统空间位置使压降呈明显的周期性波动，其波动幅度随出口含气率、系统流量、摇摆周期和角度的增大而增大，随系统压力的增大而减小。

Characteristics of Frictional Pressure Drop in Narrow Rectangular Channel in Rolling Motion

Single-phase flow and flow boiling resistances of water in narrow rectangular channel in rolling motion were investigated experimentally, the transient pressure drop characteristics were obtained and the mechanism of rolling motion effect on pressure drop oscillation was also analyzed. Rolling motion leads to the periodical fluctuation of frictional pressure drop. In the case of single-phase flow, the effect of rolling motion weakens with the increase of flow rate and temperature. While for flow boiling, position change of the system due to the rolling motion results in the fluctuation of pressure drop, of which the amplitude increases with the flow rate, vapor quality as well as rolling angle and period, and decreases with the increase of system pressure.