论文部分内容阅读
基于准三维的反问题设计方法,设计了可用于低水头可再生能源开发的超低水头轴流式水轮机的导叶和转轮叶片.导叶为等厚叶片,转轮叶片采用空化性能良好的NACA 66(MOD)翼型.设计中根据给定的进出口边环量分布及叶片表面载荷分布,在满足无撞击进口水流条件下,计算、调整叶片剖面翼型的拱度和安放角.为了验证设计方法的有效性,还对该轴流式水轮机进行了全流道的三维定常湍流计算.计算结果表明:流道内水流流动平顺,水力损失小,最高效率可以达到92.16%,且在较宽的水头变幅内,水轮机均具有良好的水力性能.
Based on the quasi-three-dimensional inverse problem design method, the guide vanes and rotor blades of ultra-low head axial-flow turbines are designed for low head renewable energy sources.The vanes are of equal thickness and the rotor blades are of good cavitation performance NACA 66 (MOD) airfoil.According to the given edge volume distribution and blade surface load distribution, the camber and installation angle of blade profile airfoil are calculated and adjusted under the conditions of non-impact inlet flow. In order to verify the validity of the design method, the three-dimensional steady turbulent flow of the full runner is also calculated for this axial-flow turbine. The calculation results show that the flow in the runner is smooth and the hydraulic loss is small. The maximum efficiency can reach 92.16% Within a wide head variation, the turbines have good hydraulic properties.