【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、扭叶片级短叶片的间隙气流激振力计算公式更多还原

【Abstract】 Because the outlet side of fixed blade has a cer tain thickness, the airflow field of steam turbine is a non-uniform airflow fie ld. Based on the hydrodynamics, the clearance air exciting-vibration force acti ng on the blades of steam turbine in the non-uniform airflow field is studied b y using the momentum theorem in this paper. The velocity of airflow was develope d 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 p arameters and airflow parameters of steam turbine and can overcome the difficult y of selecting efficiency factor in Alford formula, so they can be used to c alculate the air exciting-vibration force of steam turbine with non-uniform ai rflow field easily.更多还原