【摘要】 迄今，掺氢天然气的仿真工作始终无法有效平衡计算精度和仿真速度这2项参数，不利于指导现场运行方案的快速决策。针对这一问题，将组分追踪方程、水力方程和热力方程进行去耦仿真，分析了耦合模型与气体瞬态管网模拟软件TGNET结果、耦合模型和去耦模型结果的差异性，确定了最优的时间步长和空间步长，引入单指令多数据（SIMD）并行计算技术，基于AVX2指令集实现中间参数求解过程的快速化处理，以实际案例进行了计算和分析。结果显示：耦合模型结果与TGNET软件结果的吻合程度较高，两者的计算时间分别为8 237 ms和8 359 ms,2种模型具有一致性和相容性；去耦模型计算时采用时间步长90 s、空间步长1 km的组合较为合适，与耦合模型相比，此组合下的加速比为2.89；与最大压力-最大流量边界条件相比，最大流量-最大流量边界条件下的压力、温度、氢气摩尔分数的误差均有所增大，建议在管网规划设计、运行调峰、突发性用气和供气安全冗余保障等工况下优先使用该边界条件；与去耦模型相比，引入SIMD指令的计算加速比为2.68，低于理论加速比上限。研究结果可为大型掺氢天然气管网的仿真工作提供理论依据和实际参考。更多还原

【Abstract】 To date, the simulation of hydrogen-blended natural gas has been unable to effectively balance the two parameters of calculation accuracy and simulation speed, which is not conducive to guiding the rapid decisionmaking of on-site operation plans. To address this issue, decoupling simulations were conducted on the component tracking equation, hydraulic equation and thermal equation. The differences between the coupling model and the TGNET model, as well as between the coupling model and the decoupling model, were analyzed. The optimal time step and spatial step were determined. Single instruction multiple data(SIMD) parallel computing technology was introduced. The rapid processing of the intermediate parameter-solving process was then implemented using the AVX2 instruction set, and the calculation and analysis were carried out with actual cases. The results of the coupling model are in high agreement with those of the TGNET software. The computing times of the two models are 8 237 ms and 8 359 ms, respectively, and they show consistency and compatibility. When calculating the decoupling model, it is more appropriate to use a time step of 90 seconds and a spatial step of 1 km. Compared with the coupling model, the speedup ratio with this combination is 2. 89. Compared with the maximum pressure-maximum flow boundary condition, the errors in pressure, temperature and hydrogen molar fraction under the maximum flowmaximum flow boundary condition all increase. It is recommended to give priority to using this boundary condition in applications such as pipeline network planning and design, operation peak shaving, sudden gas consumption and gas supply safety redundancy guarantee. Compared with the decoupling model, the computational speedup ratio after introducing SIMD instructions is 2. 68, which is lower than the upper limit of the theoretical speedup ratio. These results can provide a theoretical basis and practical reference for the simulation of large-scale hydrogen-blended natural gas pipeline networks.更多还原