水电站多台机组共用调压室的流态较为复杂，通过模型试验的方法确定其水头损失系数时，历时较长，代价较高。本文利用fluent软件建立数学模型对某常规水电站多机组共用一个尾水阻抗调压室的阻抗系数进行数值模拟分析，分别研究调压室两种典型工况和不同机组台数组合运行时的情况，并将数值模拟结果与物理模型试验值进行了比较，证明用数值模拟方法研究水电站多机组共用调压室的阻抗系数值是有效可行的。

The flow pattern of surge chamber shared by the multi-unit hydropower plant is very complex. Determination of the hydraulic loss coefficient by the model experiments is time-consuming and expensive. In this paper, the FLUNT software was applied to conduct numerical simulation of the hydraulic resistance coefficient of a surge chamber shared by the multi-unit hydropower plant under the combined operation conditions of two typical working conditions and different number of units. The numerical simulation results were compared with those obtained from the physical model experiments, which suggested that the numerical method is feasible to determine the hydraulic resistance coefficient of a surge chamber shared by the multi-unit hydropower plant.