低水头混流式水泵水轮机过流能力近似计算

为了保证电力系统的稳定运行和能源的合理利用,在综合利用的多能源小电力系统中,一般通过低水头抽水蓄能电站水泵水轮机进行调节.低水头水泵水轮机过流特性直接影响其性能和效率,而自身流道参数是影响水泵水轮机过流能力的主要因素.从低水头抽水蓄能电站水泵水轮机的工作特点出发,根据水泵水轮机工作原理推导出过流能力近似计算公式.通过数值模拟方法计算了不同水头工况的流量,并与近似计算公式结果进行了对比分析.结果表明两者基本一致,且相对误差较小,在5%左右.

Approximate calculation of flow capacity of low-head Francis pump-turbine

In order to ensure the stability of power system and the rational use of energy low-head pumped storage power stations are usually used to adjust electricity in the multi-energy small power systems. The performance and efficiency of the unit are directly influenced by the pump-turbine flow capacity which is mainly decided by the channel parameters. Based on the characteristics and principles of pump-turbine in the low-head pumped storage power station, the approximate calculation formula is obtained, and the flows under different water heads are calculated by numerical simulation. The results of the formula and numerical simulation are compared, a good agreement is obtained and the relative errors are around 5%.