Numerical simulation of the 3-D unsteady flow in the last stage of the steam turbine
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摘要: 空冷汽轮机组采用空气作为冷却介质,是一种典型的变工况运行机组.深入了解透平叶片在设计状态和高背压条件下的非定常流动机理,能更好设计空冷汽轮机以及提高叶轮机械的性能和稳定性.主要利用三维粘性非定常数值模拟的方法对设计状态和高背压条件下透平叶片内部的流动进行模拟,并分析了设计状态和高背压条件下非定常流动机理.结果表明,在设计状态动静干涉作用是导致非定常现象产生的主要原因;在高背压条件下动静干涉作用很弱,导致非定常现象不明显.Abstract: Air cooling steam turbine uses air as working fluid, and it works in variable-operating condition. It is important for the design of air cooling steam turbine and the performance and stability of turbine to study unsteady flow mechanism in design and off-design state. The flow of turbine in design and off-design state was simulated by the method of numerical simulation of 3-D viscous flow, and the flow mechanism in design and off-design state was studed. The results show rotor-stator interaction causes unsteady flow in design state, and the rotor-stator interaction in off-design state is weak, the unsteady phenomena is not obvious in off-design state.
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Key words:
- turbine /
- unsteady flow /
- rotor-stator interaction
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[1] 徐力平.叶轮机内非定常流动和叶轮机气动力学的实验手段 . 气动热力学发展战略研讨会专题报告汇编 .北京,1989 Xu Liping. The experiment method of unsteady flow and aerodynamics in turbine . The Special Report Compile of Aerothermodynamics Development Strategy Proseminar . Beijing,1989(in Chinese) [2] Eulitz F, Engel K, Gebing H. Numerical inverstigation of the clocking effects in a multistage turbine . ASME 96-GT-26, 1996 [3] Hodson H P, Dawes W N. On the interpretation of measured profile losser in unsteady wake-turbine blade interaction studies . ASME 96-GT-494, 1996 -
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