| Numerical investigation on the self-excited oscillation of wet steam flow in a supersonic turbine cascade |
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| 作者姓名： | LI Liang SUN Xiuling LI Guojun FENG Zhenping |
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| 作者单位： | School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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| 摘 要： | The self-excited flow oscillation due to supercritical heat addition during the condensation process in wet steam turbine is an important issue. With an Eulerian/Eulerian model, the self-excited oscillation of wet steam flow in a supersonic turbine cascade is investigated. A proper inlet supercooling results in the transition from steady flow to self-excited oscillating flow in the cascade of steam turbine. The frequency dependency on the inlet supercooling is not monotonic. The flow oscillation leads to non-synchronous periodical variation of the inlet and outlet mass flow rate. The aerodynamic force on the blade varies periodically due to the self-excited flow oscillation. With the frequency lies between 18.1?80.64 Hz, the oscillating flow is apt to act with the periodical variation of the inlet supercooling due to stator rotor interaction in a syntonic pattern, and results in larger aerodynamic force on the blade. The loss in the oscillating flow increases 20.64% compared with that in the steady flow.
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| 关 键 词： | self-excited oscillation wet steam turbine cascade condensation. |
Numerical investigation on the self-excited oscillation of wet steam flow in a supersonic turbine cascade |
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| LI Liang,SUN Xiuling,LI Guojun,FENG Zhenping.Numerical investigation on the self-excited oscillation of wet steam flow in a supersonic turbine cascade[J].Progress in Natural Science,2006,16(9):988-992. |
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| Authors: | LI Liang SUN Xiuling LI Guojun FENG Zhenping |
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| Abstract: | The self-excited flow oscillation due to supercritical heat addition during the condensation process in wet steam turbine is an important issue. With an Eulerian/Eulerian model, the self-excited oscillation of wet steam flow in a supersonic turbine cascade is investigated. A proper inlet supercooling results in the transition from steady flow to self-excited oscillating flow in the cascade of steam turbine. The frequency dependency on the inlet supercooling is not monotonic. The flow oscillation leads to non-synchronous periodical variation of the inlet and outlet mass flow rate. The aerodynamic force on the blade varies periodically due to the self-excited flow oscillation. With the frequency lies between 18.1?80.64 Hz, the oscillating flow is apt to act with the periodical variation of the inlet supercooling due to stator rotor interaction in a syntonic pattern, and results in larger aerodynamic force on the blade. The loss in the oscillating flow increases 20.64% compared with that in the steady flow. |
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| Keywords: | self-excited oscillation wet steam turbine cascade condensation |
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