气液两相流管道流动背景噪声分析研究

Analysis and Study on Background Noise of Gas-Liquid Two-phase Flow Pipeline

随着多相流管道应用的日益广泛,其管道内流动问题成为研究的重点和难点。多相流管道在运行过程中存在多种噪声源,泄漏发生时极大地干扰了泄漏识别。为此对多相流管道正常运行时的流动背景噪声进行研究,首先通过理论分析流动背景噪声的主要影响因素,然后采集管道内不同流型工况下的流动背景噪声,利用边际谱法和概率密度函数PDF法对流动噪声的基本特征进行分析和特征量提取。该研究结果能够大大减少人为对背景噪声的主观性判断,有效地提高流动背景噪声辨别的准确度。

With the increasing application of multiphase flow pipeline,the problem of its internal flow has become the research focus and difficulty.During the operation of multiphase flow pipeline,there are many kinds of noise sources,which greatly interfere with the leakage identification when leakage occurs.Therefore,the background noise of multiphase flow pipeline during normal operation is studied.First,the main influence factors of flow background noise are studied through theoretical analysis,and then the flow background noise under different flow-type conditions of pipeline is collected.By analyzing the marginal spectrum of background noise and using the probability density function PDF method,the basic characteristics of flow noise are analyzed and its feature quantity extraction is implemented.The study can greatly reduce the subjective judgment of human on background noise and effectively improve the identification accuracy of flow background noise.