The hydraulic transients are obvious during the operation and adjustment of large-scale district heating (DH) network. Hydraulic transient modeling and simulation methods can provide basis for efficient operation of the DH network. In this paper, two hydraulic transient models, the distributed parameter model (DPM) and lumped parameter model (LPM), were established for DH network. Efficient numerical algorithms were presented for the two models. The proposed DPM and LPM were both applied to a DH network to simulate and analyze the network hydraulic transients caused by the valve and pump operations. Results indicate that with the increase of the distance from the adjustment location, the transient time for the flow rate and pressure gets longer. As the adjustment duration decreases, the transient time increases. Comparison of the simulation performances between the two models indicates that the DPM can capture the high-frequency hydraulic transients subtly. With the decrease of adjustment duration, more severe high-frequency hydraulic transients will occur. However, only the average hydraulic fluctuations can be described by LPM. The computation time of LPM is shorter than DPM because of the vectorizable calculation procedure and the less data to record, since the LPM neglects the pressure waves and the fluid compressibility.

在大型区域供热网络的运行和调整过程中，水力瞬变很明显。水力瞬变建模和仿真方法可以为DH网络的有效运行提供基础。本文为DH网络建立了两个液压瞬态模型，即分布式参数模型（DPM）和集总参数模型（LPM）。提出了两种模型的有效数值算法。拟议中的DPM和LPM均应用于DH网络，以模拟和分析由阀门和泵操作引起的网络水力瞬变。结果表明，随着距调节位置距离的增加，流速和压力的过渡时间变长。随着调整持续时间的减少，瞬态时间会增加。两种模型之间的仿真性能比较表明，DPM可以巧妙地捕获高频液压瞬变。随着调节持续时间的减少，将发生更严重的高频液压瞬变。但是，LPM只能描述平均液压波动。由于LPM忽略了压力波和流体的可压缩性，因此LPM的计算时间比DPM短，这是由于可矢量化的计算过程和较少的记录数据。