Numerical analysis of condensation effects on final-stage rotor-blade rows in low-pressure steam turbine
Numerical analysis of condensation effects on final-stage rotor-blade rows in low-pressure steam turbine
复制标题
DOI：
10.1299/jfst.2017jfst0018
复制
发表时间：
2017
影响因子：
0.8
通讯作者：
Hironori Miyazawa;Takashi Furusawa;S. Yamamoto
中科院分区：
文献类型：
--
作者：
Hironori Miyazawa;Takashi Furusawa;S. Yamamoto
问题是当气流通过定子和转子叶片的若干级时发生的冷凝如何影响这种转矩波动。摘要低压汽轮机转子叶片排上的湿蒸汽流动的非定常力与蒸汽凝结之间的因果关系是一个尚未解决的问题。在这项研究中，我们调查的凝结对末级长转子叶片列在低压蒸汽涡轮机的时间相关的扭矩的影响。在此基础上，模拟了不同进口温度条件下湿蒸汽在涡轮机三级静-动叶排中的非定常流动。入口温度的变化会导致由于冷凝而产生具有不同湿度的流场。比较了不同进口温度下的流场温度和压力，并比较了末级长动叶上随时间变化的压力计算得到的扭矩。在这项研究中的计算结果表明，上的末级长转子叶片上的时间相关的扭矩显着依赖于冷凝增加的潜热和冷凝量是高度敏感的进口温度的变化。本研究还表明，可能存在一个最佳的入口温度，以优化低压汽轮机的扭矩。
issue is the question of how such torque fluctuations are affected by the condensation that occurs as stream passes through several stages of stator and rotor blades. Of the literature we Abstract The causal relationship between unsteady forces of wet-steam flows on rotor-blade rows and the steam condensation in low pressure steam turbines is still one of unresolved issues. In this study, we investigate the effect of condensation on the time-dependent torque of final-stage long-rotor blade rows in a low pressure steam turbine. Then we simulate unsteady wet-steam flows through the three-stage stator-rotor blade rows in the steam turbine while changing the inlet temperature condition. The variation of the inlet temperature results in creating a flow field with a different amount of wetness due to condensation. The temperature and pressure in the flow field obtained from a different inlet temperature are compared with each other, and the torques calculated from the time-dependent pressure on a final-stage long-rotor blade are also relatively compared. The calculated results in this study indicate that the time-dependent torques on the final-stage long-rotor blade significantly depend on the latent heat added by condensation and that the amount of condensation is highly sensitive to variations in the inlet temperature. This study also suggests that an optimal inlet temperature may be exist for optimizing the torque of low pressure steam turbines.