【作者】 庾明达； 刘贞谷； 姜露； 张毅雄； 徐自力；

【Author】 YU Ming-da;LIU Zhen-yu;JIANG Lu;ZHANG Yi-xiong;XU Zi-li;Key Laboratory of Nuclear Reactor System Design Technology,Nuclear Power Institute of China;State Key Lab for Strength and Vibration of Mechanical Structures,School of Aerospace,Xi’an Jiaotong University;

【机构】 中国核动力研究设计院核反应堆系统设计技术重点实验室； 西安交通大学航天航空学院机械结构强度与振动国家重点实验室；

【摘要】 采用基于RANS方程的三维时域响应流固耦合迭代数值算法对新开发的核电超长末级叶片的气动稳定性进行了分析。利用流场有限元网格与叶片网格之间的交界面进行压力,位移等变量的数据交换和迭代计算,通过叶片时域位移响应趋势判断叶片是否发生颤振。计算了设计背压,2个高背压等三个工况条件。计算结果表明,动叶叶栅气流进气角度随背压增大而增大,在最高背压工况下叶高各截面的流场流动保持平稳,3种背压工况下叶片的时域响应曲线均以1阶动频模态为主进行自由衰减,叶片响应幅值均呈现收敛的趋势,数值证明了在背压增大到10 800 Pa新开发的核电超长末级叶片仍能保持气动稳定,不会发生颤振。更多还原

【Abstract】 A 3-D time-domain approach based on fluid-structure coupling by solving the RANS governing equation is carried out to analyze the aerodynamic stability of super long last-stage blades of a newly developed nuclear turbine.The unsteady analysis under a design and two highbackpressure conditions are achieved and the results show that the amplitudes of blade vibration curves are all attenuating with the first natural frequency under the three backpressure operating conditions,which numerically proves that the newly developed turbine blades will maintain aerodynamic stable and there is no flutter up to the 10 800 Pa backpressure condition.更多还原