摘要
针对超临界600 MW机组汽轮机高压缸第1级配置的斜置静叶,采用Fluent软件建立了汽轮机静叶不同斜置角度(斜度)的计算模型,模拟分析了静叶在0°,30°,45°和60°4种斜度下蒸汽的流场和能量转换特性。结果表明:随着静叶斜度的增大,压力面的压力损失减小,吸力面的附面层厚度减小,进而流动损失减小;静叶斜度的存在降低了能量的转换作用;随着静叶斜度的增大,静叶出口汽流速度和出口汽流角沿叶高的分布减小,出口的平均动能呈减小趋势,这可能有助于改善汽轮机的安全性能。该结论可为同类机组汽轮机的设计提供参考。
By Fluent software,the numerical model for the oblique stator in the first stage of high pressure cylinder of a supercritical 600 MW unit steam turbine was established to investigate the flow filed and energy conversion characteristics of the steam,under conditions with the static blade＇s inclination angle of 0°,30°,45°and 60°.The results show that,with an increase in the static blade＇s oblique angel,the pressure loss of the pressure side decreases,and the thickness of the boundary layer of the suction face decreases,thereby the flow loss and the profile loss decreases.The presence of oblique angle weakens the role of energy conversion.With an increase in the oblique angle,the steam velocity and flow angle at the static blade outlet decreases along the blade height direction,and the average kinetic energy at the outlet decreases.This may help improving the safety of the steam turbine.
出处
《热力发电》
CAS
北大核心
2016年第6期40-45,共6页
Thermal Power Generation
基金
国家自然科学基金项目(51475088)
关键词
超临界机组
汽轮机
静叶
斜度
流场
能量转换
压力面
吸力面
supercritical unit
steam turbine
static blade
oblique angle
flow field
energy conversion
pressure side
suction face
