CAJ | 학술논문

采用RNG k-ε湍流模型对一可用于小水电、越浪式波浪能发电的单级超低水头水轮机进行了全流道三维非定常流动计算，应用滑移网格技术考察了动静干涉效应。通过数值模拟计算，分析比较了不同流量下水轮机压力、轴向速度的脉动特性，以及轴向水推力、力矩的变化规律。结果表明：水轮机内流场周期性脉动明显，该周期性脉动主要由静叶尾迹与动叶间的干扰所引起，脉动频率以叶片通过频率为主；随着流量（水头）的增加，无叶区压力、轴向速度的波动幅值均逐渐增大。
채용RNG k-ε단류모형대일가용우소수전、월랑식파랑능발전적단급초저수두수륜궤진행료전류도삼유비정상류동계산，응용활이망격기술고찰료동정간섭효응。통과수치모의계산，분석비교료불동류량하수륜궤압력、축향속도적맥동특성，이급축향수추력、력구적변화규률。결과표명：수륜궤내류장주기성맥동명현，해주기성맥동주요유정협미적여동협간적간우소인기，맥동빈솔이협편통과빈솔위주；수착류량（수두）적증가，무협구압력、축향속도적파동폭치균축점증대。
The renormalization group ( RNG) k-εturbulence model is used to investigate the unsteady 3-D flow charac-teristics of a single-stage ultra-low water head hydraulic turbine .A sliding mesh technique is adopted to study the rotor-stator interaction effect .Fluctuation characteristics of the water pressure and the axial velocity , the axial hydraulic thrust and torque on the runner under different flow rates are obtained and compared .Results show that the flow is character-ized by periodic pulsation , and the blade passing frequency dominates the fluctuation frequency .The periodic pulsation is mainly caused by interaction between the stator-wake and the rotor .Fluctuation amplitude of the pressure and axial velocity increases with the increasing flow rate .