耦合末级的1000MW汽轮机排汽通道数值模拟

发布时间：2018-03-27 08:51

本文选题：MW汽轮机　切入点：排汽通道　出处：《中国电机工程学报》2017年16期

【摘要】：排汽通道流场的好坏直接影响凝汽器的换热性能和机组的安全经济性。利用计算流体力学(computational fluid dynamics,CFD)软件,综合考虑汽轮机末级、排汽缸和凝汽器喉部三者之间的相互影响,对某1000MW机组进行了汽轮机末级和排汽通道的整体耦合研究,并与部分耦合时的计算结果进行对比,以便清晰地了解排汽通道的真实流场。针对排汽通道流场分布特点,通过装设多组导流板对排汽通道流场进行合理改善。计算结果表明:在排汽通道流场和气动性能方面,整体耦合与部分耦合的模拟结果存在较大的差异;加装导流板后,排汽通道流场得到明显改善,在100%工况下,发电机侧排汽通道的压损减小了191.83Pa,出口处汽流的均匀性系数增大了9.26%。
[Abstract]:The flow field of exhaust channel directly affects the heat transfer performance of condenser and the safety and economy of unit. By using computational fluid dynamics (CFD) software, the interaction among the final stage of steam turbine, exhaust cylinder and condenser throat is considered synthetically. The integral coupling between the final stage of steam turbine and exhaust passage of a 1000MW unit is studied, and the results of calculation are compared with those of partial coupling in order to clearly understand the real flow field of exhaust steam channel. The flow field of exhaust passage is improved reasonably by installing several sets of guide plates. The results show that there is a great difference between the simulation results of integral coupling and partial coupling in the flow field and aerodynamic performance of exhaust duct, and the simulation results show that the flow field of exhaust channel is improved by installing the guide plate. The flow field of exhaust channel is improved obviously. Under 100% working condition, the pressure loss of generator side exhaust channel is reduced by 191.83 Pa, and the uniformity coefficient of steam flow at outlet increases by 9.26%.
【作者单位】：电站设备状态检测与控制教育部重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(51606066) 中央高校基本科研业务费专项资金资助项目(2017MS117)~~
【分类号】：TM621

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