灯泡贯流式水轮机装置甩负荷过渡过程基于内特性解析理论的数值计算方法

Numerical method based on internal character for load rejection transient calculation of a bulb turbine installation

针对工程实际中具有双调节元件的水轮机装置缺少全特性曲线时无法进行过渡过程计算的问题,采用基于内特性解析理论的数值计算方法对灯泡贯流式水轮机装置甩负荷过渡过程进行研究和计算;采用自行开发的计算软件对广东省封开县白垢水电站灯泡贯流式水轮机装置进行甩负荷过渡过程理论计算。结果表明:计算得到的最大转速相对额定转速上升了71.6%,实测最大转速上升率为67.4%,计算值与实测值的相对误差为6.2%;计算得到的最大压力相对初始压力上升了27.5%,实测最大压力上升率为28.75%,计算值与实测值的相对误差为4.3%。转速和压力上升率的相对误差均小于10%,满足工程需要。基于内特性解析理论的数值计算方法可供工程实际中计算过渡过程。

In practical project, when lacking the whole combined characteristic curve of bulb turbine, we can＇t use the traditional method of external character to calculate the load rejection transient. To resolve this problem, this paper uses the Numerical Method of Internal Character Analysis to calculate the load rejection transient of bulb turbine installation. Authors developed a software package to calculate the load rejection transient of bulb turbine installation in Baigou hydropower plant located in Fengkai county, Guangdong province. The maximum rotate speed calculated increase by 71.6% compared with the rated rotate speed. The test ratio increase by 67.4% with 6.2% of relative error; the maximum pressure calculated 27.5% compared with the initial pressure, the test ratio 28.75% with 4.3% of relative error. The results indicate that the relative errors of speed and pressure rises are all less than 10%, this accords with the practical project need. So the numerical method based on internal character for calculating the load rejection transient of bulb turbine installation is a feasible method in practical project.