水电站放空洞及导流洞一体化流量系数分析

对高水头电站放空洞与导流洞结合的过流能力进行了水工模型试验,并采用CFD计算软件对放空洞有压段出口断面流量系数进行了计算。物理模型试验结果与数值模拟计算结果对比分析表明:不同水位下对应的放空洞压力出口断面数学模型与物理模型所得雷诺数都随库水位的上升而增大,上升幅度大致相同,且都有线性上升的趋势;前者流量系数为0.884～0.897,后者为0.902～0.904,最大绝对偏差为0.02,可见两者结果十分吻合;合理的压坡段坡度有利于增大结构过流能力。

Analysis on Discharge Coefficient of Emptying Tunnel Combined with Diversion Tunnel of Hydropower Station

Hydraulic model test were done for flow capacitying of reservoir emptying tunnel combined with diversion tunnel of high head development.We adopted CFD software fluent to carry out numerical simulations,calculated,and analyzed discharge coefficient of pressure stage export cross-section of emptying tunnel.Comparative analysis results of physical model test and numerical simulation show that correspond different water level Reynolds number of digital analogy and physical simulation of pressure cross-section of the emptying tunnel increase with the rising of water lever,the increase is roughly the same as linear trend.The former discharge coefficient is 0.884-0.897,the latter is 0.902-0.904,a biggest absolute deviation is 0.02.The two results are coincide visibly.Suitable slope gradient is benefit to increasing flux.