摘要
从流体动力学出发 ,应用动量定理研究了定叶片出气边具有一定厚度的非均匀气流场中汽轮机的间隙气流激振力 ,将气流速度展开成 Fourier级数 ,并综合考虑了叶片的各项设计参数 ,并应用理论分析的方法导出了在非均匀气流场中汽轮机直叶片级。
Because the outlet side of fixed blade has a certain thickness, the airflow field of steam turbine is a non-uniform airflow field. Based on the hydrodynamics, the clearance air exciting-vibration force acting on the blades of steam turbine in the non-uniform airflow field is studied by using the momentum theorem in this paper. The velocity of airflow was developed into Fourier series firstly, and then the computational formulas for the short blades in straight stages and twist stages of steam turbine in the non-uniform airflow field was derived. The presented formulas only include the structural parameters and airflow parameters of steam turbine and can overcome the difficulty of selecting efficiency factor in Alford formula, so they can be used to calculate the air exciting-vibration force of steam turbine with non-uniform airflow field easily.
出处
《机械科学与技术》
EI
CSCD
北大核心
2001年第3期343-345,共3页
Mechanical Science and Technology for Aerospace Engineering
基金
国家攀登计划项目 (PD95 2 190 0 )
国家自然科学基金项目 (19990 5 10 )
