气液混输管道泄漏声波产生机理与传播特性研究

气液混输管道安全问题一直是管道安全运行维护过程中的难点问题。本课题耦合声波法泄漏检测和多相流理论，研究气液混输管道中泄漏声波产生机理和传播特性。首先分析气液两相流管道发生泄漏时的声波特性敏感性和气液两相流管道流体流动背景噪声产生机理，建立不同流型下两相流管道泄漏时声波信号特征模型和气液两相流管道流体流动的噪声特征数据库；其次通过理论、数值模拟和实验相结合的方法，深入研究不同流型情况下声波传播和衰减规律及其影响因素，分别推导不同流型下泄漏声波声速公式和建立相应流型下的声波衰减模型；最后基于多种现代信号技术的声波特征提取方法研究适合气液混输管道泄漏声波传播的滤波方法和信号处理技术，得到流体流动条件和管道条件下管道泄漏声波传播的特征值，形成气液混输管道声波信号处理新方法，实现准确管道泄漏检测判断，为气液混输管道泄漏检测系统的建立奠定理论基础。

The safety of Gas liquid multiphase flow pipelines is always a difficult problem in the process of the safe operation of pipeline maintenance. Coupling the acoustic method of leak detection technology and the theory of multiphase flow, the generation mechanism and propagation characteristics of leakage acoustic signal in Gas liquid pipelines are studied. First, the sensitivity of Gas liquid multiphase flow pipelines leakage acoustic characteristics and the leakage acoustic vocal mechanism and acoustic source characteristics are analyzed. And built the Gas liquid multiphase flow pipelines leakage acoustic characteristics model under different flow patterns and the characteristics database of flow noise. Secondly, the mechanism and influencing factors of acoustic signal propagation and attenuation in different flow regimes of gas liquid mixed pipelines are studied by the combination of theory, numerical simulation and experiment, then to deduce the leak acoustic velocity under different flow pattern, and to build a corresponding flow pattern of acoustic attenuation model. Finally, the filtering method and signal processing technique for acoustic wave propagation in gas liquid mixed transportation pipelines based on the technology of modern signal are studied, and the correspond characteristic values of acoustic signal propagation in pipeline leakage under the condition of fluid flow and pipeline is obtained, and develops a new acoustic signal processing method for gas liquid pipelines, so as to accurately detect pipeline leakage, then lays a theoretical foundation for the establishment of oil and gas-liquid mixing transport system.