明渠—前池—有压引水系统水力瞬变过程计算研究

发布时间：2018-05-10 05:27

本文选题：明渠 + 有压引水系统　；参考：《水利水电技术》2017年04期

【摘要】：针对水电站明渠—前池—有压引水系统水力瞬变过程中明渠段和有压段时间步长相差大、计算过程复杂等问题,提出了有限差分法和特征线法相结合的计算方法。对明渠和有压引水系统分别采用有限差分法与特征线法计算,把前池当集中元件处理,联合水轮机、调速器计算模型,采用统一的时间步长,在Simulink中采用模块化编程,进行过渡过程计算。将模型应用于MZD水电站水力瞬变过程计算,得到关键节点调压室的最高涌浪水位计算值为2 178.96 m,而物理试验值为2 178.57 m,二者非常接近。调压室水位波动过程线与试验结果亦吻合良好。研究表明,有限差分法和特征线法相结合,实现了明渠段和有压段时间步长的统一,降低了计算的复杂程度,可用于明渠—前池—有压引水系统设计。
[Abstract]:In view of the large difference of time step between open channel and pressure section in hydraulic transient process of open channel, forepool and pressure diversion system of hydropower station, and the complexity of calculation process, the method of combining finite difference method and characteristic line method is put forward. The open channel and pressurized water diversion system are calculated by the finite difference method and the characteristic line method respectively. The front pool is treated as a centralized element, the calculation model of the combined turbine and governor is adopted, the unified time step is adopted, and the modular programming is adopted in Simulink. Calculate the transition process. The model is applied to the calculation of hydraulic transient process of MZD Hydropower Station. The maximum surge water level of the key node surge chamber is 2 178.96 m and the physical test value is 2 178.57 m, which is very close to each other. The process line of water level fluctuation in the surge chamber is in good agreement with the experimental results. The results show that the combination of finite difference method and characteristic line method can realize the unification of the time step between the open channel section and the pressure section, and reduce the complexity of calculation. It can be used in the design of open channel, forepool and pressurized water diversion system.
【作者单位】：河北工程大学水利水电学院;
【基金】：水利部公益性行业专项经费项目(201401030)
【分类号】：TV133

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