输气管道气固耦合振动特性分析

The Vibration Characteristics Analysis of Gas and Solid Coupling in Gas Pipelines

针对管道振动情况的研究,提出考虑气体压力脉动与管道耦合作用下的管道振动特性分析的计算模型与计算方法。根据管道结构建立了具有异径管活塞式压缩机的输气管道模型,在该模型的基础上,结合管道结构参数,建立管道系统气柱固有频率、气体压力脉动、激振力的计算方法,通过这些计算方法得出气柱固有频率、气体压力脉动与模态阶次之间的关系,以及异径管处的激振力与宽径比之间的关系;得出在激振力作用下,管道振动位移、速度的变化情况。将计算结果与现场测试值进行对比,发现计算值与测试值基本吻合,验证了计算模型与方法的正确性。研究结果表明:在异径管、弯管、汇流管等处,将压力脉动与管道的耦合作用考虑进管道振动研究分析中,更能真实地反映输气管道的振动特性,对提高管道寿命、减少管道振动具有重要的参考价值。

For researching gas pipeline vibration, the vibration model and analysis methods for pipeline considering pressure pulsation and pipeline couplings are presented in this paper. According to the pipeline structure, the model of piston compressor of gas pipeline with different diameter pipes is established. Based on the models and combined with the structure parameters of pipeline, the calculation methods of gas column natural frequently, gas pressure pulsation and exciting force are established. Through these methods, the relationships between the gas column natural frequency and modal order, the gas pressure pulsation and modal order, and the exciting force and aspect ratio are acquired. Besides, the change relationship of vibration displacement and velocity of pipeline under the action of exciting force is obtained. Comparing the calculated results with the field test values, the calculated results are in agreement with the test values, and the correctness of the model and method is verified. The study results show that： in different diameter pipes, elbow, and collecting pipe, taking the pressure pulsating and pipe coupling effect account into the vibration analysis of pipeline, can truly reflect the vibration characteristics of pipeline and has important reference value for improving the service life and reducing the vibrations of the pipeline.