大型汽轮机排汽通道流场的三维数值研究
发布时间：2018-10-26 10:31
【摘要】：本文应用FLUENT流体计算软件,分别模拟汽轮机排汽缸和凝汽器喉部内流场,并提出优化改造的方案。同时,考虑到单独模拟与排汽通道耦合模拟结果的差异,建立了汽轮机排汽缸和凝汽器喉部耦合模型并模拟其内部流场,在此基础上通过合理添加导流板来优化排汽通道性能。计算结果表明,排汽缸扩压器线型的调整,可有效改善排汽缸的气动性能;小汽机排汽对喉部内流场结构有着明显的影响,进行数值模拟时有必要加入小汽机排汽口;排汽通道耦合模拟时,无论其进口汽流是直流工况还是旋流工况,在排汽通道上游、中游、下游适当加装导流板均能有效改善通道内流场,但直流工况下的改造效果更加明显,同时,越靠近上游,汽阻优化效果越明显,而在下游添加挡板则更有利于提高出口流场的均匀度。
[Abstract]:In this paper, FLUENT fluid calculation software is used to simulate the internal flow field of steam turbine exhaust cylinder and condenser throat, respectively. At the same time, considering the difference between separate simulation and exhaust channel coupling simulation, the coupling model of steam turbine exhaust cylinder and condenser throat is established and its internal flow field is simulated. On the basis of this, the performance of exhaust passage is optimized by adding reasonable flow guide plate. The calculation results show that the aerodynamic performance of exhaust cylinder can be improved effectively by adjusting the line of exhaust cylinder diffuser, and the exhaust steam of small steam turbine has obvious influence on the structure of internal flow field in the throat, so it is necessary to add the exhaust steam outlet of small steam engine to the numerical simulation. In the coupling simulation of exhaust channel, no matter whether the inlet steam flow is a DC condition or a swirling flow condition, the flow field in the channel can be effectively improved by properly installing a guide plate in the upstream, middle and lower reaches of the exhaust channel, but the modification effect is more obvious under the DC condition. At the same time, the more close to the upstream, the more obvious the effect of steam resistance optimization, and the downstream adding baffle is more conducive to improve the uniformity of the outlet flow field.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK261
[Abstract]:In this paper, FLUENT fluid calculation software is used to simulate the internal flow field of steam turbine exhaust cylinder and condenser throat, respectively. At the same time, considering the difference between separate simulation and exhaust channel coupling simulation, the coupling model of steam turbine exhaust cylinder and condenser throat is established and its internal flow field is simulated. On the basis of this, the performance of exhaust passage is optimized by adding reasonable flow guide plate. The calculation results show that the aerodynamic performance of exhaust cylinder can be improved effectively by adjusting the line of exhaust cylinder diffuser, and the exhaust steam of small steam turbine has obvious influence on the structure of internal flow field in the throat, so it is necessary to add the exhaust steam outlet of small steam engine to the numerical simulation. In the coupling simulation of exhaust channel, no matter whether the inlet steam flow is a DC condition or a swirling flow condition, the flow field in the channel can be effectively improved by properly installing a guide plate in the upstream, middle and lower reaches of the exhaust channel, but the modification effect is more obvious under the DC condition. At the same time, the more close to the upstream, the more obvious the effect of steam resistance optimization, and the downstream adding baffle is more conducive to improve the uniformity of the outlet flow field.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK261
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