为研究导叶时序对多级液力透平性能的影响，以两级径流式液力透平为研究对象，建立以首级导叶周向位置为基准，依次将次级导叶周向旋转10°的5种时序方案。基于RNG k-ε湍流模型对不同导叶时序位置引起的内流瞬态特性进行了研究。结果表明：导叶时序对液力透平外特性曲线有一定影响，但对各过流部件压力脉动影响更为显著；各监测点处压力脉动主频幅值随着导叶交错角度的增大呈现出不同的规律，当交错角度为40°时液力透平内压力脉动降幅最大，首、次级叶轮出口和次级导叶过渡段主频幅值相比0°方案分别降低了11%，51%和16%；导叶时序对首、次级导叶出口压力脉动几乎无影响。

In order to study the effect of guide vane clocking on the performance of multistage hydraulic turbines, taking the twostage radialflow hydraulic turbine as the research object, five clocking schemes were established in which the circumferential position of the firststage guide vane was used as the benchmark, and the secondary guide vane was rotated by 10° in the circumferential direction successively. Based on the RNG kε turbulence model, the transient characteristics of the inner flow caused by different guide vane clocking positions were studied. The results show that the guide vane clocking has a certain influence on the external characteristic curve of the hydraulic turbine, but it has a more significant influence on the pressure pulsation of the flow components; the main frequency amplitude of the pressure pulsation at each monitoring point presents different laws with the increase of the guide vane staggered angle. When the staggered angle is 40°, the pressure pulsation reduction amplitude in the hydraulic turbine is biggest, the main frequency amplitudes of the primary and secondary impeller outlet and the secondary guide vane transition section are reduced by 11%, 51% and 16% respectively compared with the 0° scheme; the guide vane clocking has almost no effect on the pressure pulsation at the outlet of the primary and secondary guide vanes.

TK734

国家自然科学基金（51569013）；甘肃省杰出青年基金（20JR10RA203）；河南省博士后科研启动项目（2021-181）