【摘要】 针对重力引起的水平环状流液膜厚度沿周向分布的不对称性 ,用 5组双平行电导探针测量了周向 5个角度处的瞬态液膜厚度随时间的变化。分析了平均液膜厚度沿周向的分布及其随气、液折算速度的变化特性。运用时频分析方法研究了环状流扰动波信号的概率密度函数、概率分布函数、自相关函数、互相关函数以及功率谱密度函数的基本特征 ,揭示了扰动波的特性及其沿周向的频率分布规律 ,为水平环状流液膜厚度的预测模型提供了实验依据更多还原

【Abstract】 For annular flow in a horizontal pipe, the gravity force resulted in an asymmetric distribution of the liquid film flowing along the pipe wall. Five parallel wire conductance probes were used to record time variations of the local liquid film thickness at five circumferential positions. The characteristics of the circumferential liquid film thickness profiles and their variations were measured for various gas and liquid velocities. The basic features of the probability distribution function, the probability density function, the auto correlation, the cross correlation and the power spectrum density function of the disturbance waves in the annular flow were studied in both the time and frequency domains. The characteristics of the circumferential profiles of the disturbance waves and their variations with gas and liquid velocities are also presented.更多还原