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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
Aiming at the asymmetry of the distribution of horizontal annular fluid film thickness in the circumferential direction caused by gravitational force, the change of transient liquid film thickness at 5 angles in the circumferential direction with time was measured by five sets of double parallel conductance probes. The distribution of the average liquid film thickness in the circumferential direction and its changing characteristics with gas and liquid velocity are analyzed. The basic characteristics of probability density function, probability distribution function, autocorrelation function, cross-correlation function and power spectral density function of annular flow disturbed wave signal are studied by using time-frequency analysis method. The characteristics of perturbation wave and its characteristics along the circumferential The frequency distribution law provided the experimental evidence for the prediction model of horizontal annular fluid film thickness