350MW抽风式空冷汽轮发电机轴流风扇性能研究

Study on Properties of Axial Flow Fan for 350MW Extracting Air-cooled Turbo-generator

为使汽轮发电机轴流风扇产生的气动摩擦损耗不直接引入到电机内部,研制了大容量350MW抽风式空冷汽轮发电机。基于该电机在试验条件下轴流风扇安装角为29.2°的运行数据,开展CFD仿真计算,研究扇叶的安装角(29.2°、31.2°)和叶片数对静压效率、压升、温升等风扇性能参数的影响。通过数据分析发现,在保证风扇数目足够的情况下,电机风量较大时,可采用风扇安装角度31.2°,同时适当提高空冷器冷却能力;在电机风量较少时,建议采用风扇安装角29.2°。

In order to introduce the aerodynamic friction loss generated by the axial flow fan of the turbo generator indirectly into the generator,a large-capacity 350MW air-cooled turbo-generator was developed.Based on the operating data of the axial flow fan installation angle of 29.2°under the test conditions,the CFD simulation calculation was carried out to study the influence of the fan installation angle(29.2°、31.2°)and the number of blades on fan performance parameters such as static pressure efficiency,pressure rise and temperature rise.Through data analysis,it is found that as the number of fans is sufficient,the fan installation angle of 31.2°could be used when the air volume of the generator is larger,and the cooling capacity of the air cooler could be appropriately improved.When the air volume of the generator is smaller,it is recommended to use the fan installation angle of 29.2°.