大型立式水轮发电机闭路循环通风系统仿真研究

发布时间：2018-06-29 08:57

本文选题：水轮发电机 + 闭路循环　；参考：《中国电机工程学报》2014年35期

【摘要】：大型立式水轮发电机通风冷却对其安全稳定运行影响很大,研究发电机闭路循环通风流场特征是非常有必要的。目前,由于发电机内通风流道多、尺寸差异大,进行全流道建模模拟计算量过大,而给数值研究全流道通风流场带来一定的困难。该文提出了一种利用最小周期性单元建模研究发电机闭路循环流场的方法,并在CFX软件中引入了多重参考系坐标和冷却器多孔介质模型进行数值模拟计算。计算结果表明:轴向中心位置的定子通风沟风量较小,建议采用增大其横截面积的方法以增大风量,改善定子通风均匀性;磁轭风沟入口面流场存在一定的不均匀性,证明局部建模给定边界条件是不准确的;发电机上下端部流场存在不利涡。该文进一步对上下端部设置过渡圆弧板改造,并达到消除电机端部不利涡,通风量比原设计增大15.3%的效果。研究结果可为发电机通风系统的优化设计提供参考依据。
[Abstract]:The ventilation and cooling of large vertical Hydrogenerator has a great influence on its safe and stable operation. It is very necessary to study the characteristics of the closed loop ventilation flow field of the generator. At present, because of the large flow channel in the generator and the large size difference, the simulation calculation of the full flow passage is too large, which brings a certain amount of numerical study on the full flow field. This paper puts forward a method to study the closed loop flow field of the generator by using the minimum periodic element model. The multiple reference coordinate and the porous medium model of the cooler are introduced in the CFX software. The calculation results show that the air volume of the stator in the axial center is smaller, and it is suggested to increase its transverse flow. The method of cutting area is to increase the air volume and improve the uniformity of the stator ventilation. The flow field of the entrance surface of the yoke wind gully has some inhomogeneity, which proves that the given boundary condition is inaccurate in the local modeling; the flow field in the upper end of the generator has an unfavorable vortex. The results show that the ventilation capacity is 15.3% higher than that of the original design. The research results can provide a reference for the optimal design of the generator ventilation system.
【作者单位】：中国农业大学水利与土木工程学院;杭州力源发电设备有限公司;清华大学热能工程系;
【基金】：国家自然科学基金项目(51279205)~~
【分类号】：TV735

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