CAJ | 학술논문

为了分析和预测混流式机组导水机构在运行中出现的损伤，结合华能瑞丽江一级水电站机组的设计参数及运行实例，利用CFD软件，采用雷诺时均Navier-Stokes控制方程、S-A湍流模型和SIMPLC算法，对额定运行工况下的混流式机组导水机构进行三维数值模拟，分析导水机构内部流速场、压力场分布情况。数值模拟结果显示，蜗壳引水区流态良好，活动导叶区流态紊乱，出口边存在较大尺度脱流现象，压力分布不均匀，背水面偏心小圆面处出现负压区，存在空化现象，能量损失较为严重。水电站导水机构实际运行情况与数值模拟结果基本吻合，证明了数值模拟方法的有效性。根据导水机构损伤情况提出了相应的修复建议。
위료분석화예측혼류식궤조도수궤구재운행중출현적손상，결합화능서려강일급수전참궤조적설계삼수급운행실례，이용CFD연건，채용뢰낙시균Navier-Stokes공제방정、S-A단류모형화SIMPLC산법，대액정운행공황하적혼류식궤조도수궤구진행삼유수치모의，분석도수궤구내부류속장、압력장분포정황。수치모의결과현시，와각인수구류태량호，활동도협구류태문란，출구변존재교대척도탈류현상，압력분포불균균，배수면편심소원면처출현부압구，존재공화현상，능량손실교위엄중。수전참도수궤구실제운행정황여수치모의결과기본문합，증명료수치모의방법적유효성。근거도수궤구손상정황제출료상응적수복건의。
Fransic turbine units play a dominant role in hydropower development,and it is still under research in China. Accordinf to the hydro-power station of Ruili River in Myanmar,Fransic turbines of which the installed capacity reach 60MW had been researched. Based on the Reyn-olds-averafed Navier-Stokes equations,the S-A turbulence model and SIMPLEC alforithm,the three-dimensional distributor of Fransic turbine was numerically simulated by CFD software. Flow distribution,pressure field and velocity field which inside the distributor under the rated conditions had been analyzed. The results show that the flow pattern of volute is steady,the pressure distribution is well-distributed,and the loss of water head is small. But in fuide vanes area,the flow pattern disorderrs and nefative pressure exists in the local position. Flow separation,cavitation and vor-ticity led to more enerfy loss. The numerical simulation results and practical operation have been compared and the numerical simulation results afree with the practical operation results,which indicates the accuracy of numerical simulation. Repair suffestions are put forward based on damafe situation of distributor.