Bezier函数型径向弯叶片及其在AP1000核电常规岛前置泵中的应用

Bezier Function Type Radially Bent Blades and Their Applications in the Booster Pumps Installed in the Conventional Island of the AP1000 Nuclear Power Station

基于Bezier函数叶片造型设计方法,针对AP1000核电常规岛前置泵大容量高参数的特性,提出性能优良的"正弯叶片"和"反弯叶片"两种叶片径向弯曲结构。详细比较这两种形式径向弯叶片几何特征。在此基础上,通过计算流体力学技术并结合试验方法对上述两种径向弯叶片的水力特性进行研究,并提出最优的叶片径向弯度参数。通过CFD(计算流体力学)技术并结合试验方法对上述两种径向弯叶片的水力特性进行研究,结果表明:叶片径向弯曲使叶片负荷沿叶高重新分布,这是提升AP1000前置泵性能的主要因素;在设计工况下,"正弯叶片"相对于传统"直叶片"扬程提高12 m,效率提高0.6%,相对于"反弯叶片"扬程提高17m,效率提高0.7%,满足了将AP1000核电机组常规岛前置泵性能提升的要求。

By adopting the method for modeling and designing Bezier function type blades and in the light of such specific features as a large capacity and high parameters of the booster pumps installed in the conventional island of the AP1000 nuclear power station,presented were two types of radially bent blade structure with excellent performance, i. e.＂positively bent blade＂and＂negatively bent blade＂. The hydraulic characteristics of both radially bent blades mentioned above were studied by adopting the CFD technology in combination with the test methods. It has been found that to radially bend the blades to make the blade load redistributed along the blade height is regarded as the main factor in improving the performance of the AP1000 booster pumps. Under the design condition,the＂positively bent blade＂has a head of 12 meters higher than that of the traditional straight blade and an efficiency of 0. 6% higher than that of the traditional one while 17 meters higher than that of the ＂negatively bent blade＂and 0. 7% higher than that of the＂negatively bent one＂,thus meeting the requirements set for improvement in the performance of the booster pumps installed in the conventional island of the AP1000 nuclear power station.