多能互补发电系统中杨家湾水电站水轮机压力脉动特性的数值研究

Numerical Study on Pressure Fluctuation Characteristics of Turbine in Yangjiawan Hydropower Station in Multi-energy Complementary Power Generation System

在多能互补联合发电系统中,水电作为调节系统,为了平衡系统中出力的波动,需要频繁地改变运行工况。而在偏工况下运行时,水轮机就会出现压力脉动、水力振动等稳定性问题。本文针对多能互补联合发电系统中的杨家湾水电站混流式水轮机,开展了压力脉动特性数值研究,对杨家湾水电站额定水头下不同导叶开度工况进行非定常数值计算,设置了一系列各过流部件监测点,通过快速傅里叶变换(FFT)对水轮机内部压力脉动进行频谱分析,找出了各过流部件产生压力脉动的原因,研究了不同工况下水轮机压力脉动特性。

In the multi-energy complementary combined power generation system,as the regulating system,hydropower needs to change the operating conditions frequently in order to balance the fluctuation of output in the system.However,when the turbine runs under partial conditions,there will be pressure pulsation,hydraulic vibration and other stability problems.In this paper,the numerical study of the pressure pulsation characteristics of the Francis turbine of Yangjiawan Hydropower Station in the multi-energy complementary combined power generation system is carried out.The unsteady numerical calculation of the different guide vane opening conditions under the rated head of Yangjiawan Hydropower Station is carried out.A series of monitoring points of each overcurrent component are set up.The spectrum analysis of the pressure pulsation inside the turbine is carried out by fast Fourier transform(FFT),and the causes of the pressure pulsation of each overcurrent component are found out.The pressure pulsation characteristics of the turbine under different working conditions are studied.