基于隐式压力修正的天然气管道瞬变流动仿真研究
Simulation study of transient flow in natural gas pipelines based on the implicit pressure correction method
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- 引用格式:
-
任长胜,徐波.基于隐式压力修正的天然气管道瞬变流动仿真研究[J].天然气与石油,2026,44(1):24-32.doi:10.3969/j.issn.1006-5539.2026.01.003
Ren Changsheng, Xu Bo.Simulation study of transient flow in natural gas pipelines based on the implicit pressure correction method[J].Natural Gas and Oil,2026,44(1):24-32.doi:10.3969/j.issn.1006-5539.2026.01.003
- DOI:
- 10.3969/j.issn.1006-5539.2026.01.003
- 作者:
- 任长胜 徐波
Ren Changsheng, Xu Bo
- 作者单位:
- 国家石油天然气管网集团有限公司科学技术研究总院分公司, 天津 300457
PipeChina Institute of Science and Technology, Tianjin, 300457, China
- 关键词:
- 瞬变流动;压力修正;总压;对流项
Transient flow; Pressure correction; Total pressure; Convective term
- 摘要:
随着中国天然气管网规模不断扩大,天然气管道内的瞬变流动对管道输气效率和安全运行影响显著,对其精确仿真尤为重要。建立了包含连续性方程、动量守恒方程和能量守恒方程的瞬态数学模型,提出了一种基于隐式压力修正的方法,通过合并动量方程中的对流项和压力项,构建以总压修正项为核心的隐式压力修正方程,并采用交错网格方法对控制方程进行离散化,发展了一种基于隐式压力修正方法的非等温天然气管道瞬变流动模型。基于天然气管道实验数据进行验证,结果表明,管道入口、中点和出口处压力及体积流量的数值模拟预测值与实测数据吻合良好,证明了所提模型和方法的准确性和适用性。在阀门关闭瞬态研究中发现,阀门关闭后管道内质量流量、压力和密度均出现波动传播,压力在阀门附近迅速上升并向管道上游传播,密度波动与压力波动的时空特征相似。基于隐式压力修正方法的非等温天然气管道瞬变流动模型能够有效模拟天然气管道瞬变流动过程，为保障管道安全运行、优化管道设计和调度管理提供了理论依据和技术参考。
With the continuous expansion of China's natural gas pipeline network, the transient flow in natural gas pipelines has a significant impact on the gas transmission efficiency and safe operation of the pipelines, making accurate simulation particularly important. A transient mathematical model incorporating the continuity equation, momentum conservation equation, and energy conservation equation is established in this study, and a method based on implicit pressure correction is proposed. By combining the convective and pressure terms in the momentum equation, a pressure correction equation based on the total pressure correction term is developed, and the staggered grid method is adopted to discretize the governing equations. Finally, a transient flow model for non-isothermal natural gas pipelines based on implicit pressure correction method is developed. Validation against experimental data from natural gas pipelines indicates that the numerically predicted pressure and volumetric flow rate at the pipeline inlet, midpoint, and outlet are in good agreement with the measured data, demonstrating the accuracy and applicability of the proposed model and method. In the study of the valve-closing transient process, it is found that after valve closure, the mass flow rate, pressure, and density in the pipeline all exhibit fluctuating propagation. The pressure rises rapidly near the valve and propagates upstream along the pipeline, with density fluctuations exhibiting spatiotemporal characteristics similar to those of the pressure fluctuations. The transient flow model for non-isothermal natural gas pipelines based on the implicit pressure correction method can effectively simulate the transient flow processes in natural gas pipelines, providing a theoretical basis and technical reference for ensuring the safe operation of pipelines, optimizing pipeline design, and improving scheduling management.
