摘要
在气-液两相流试验装置上研究了汽轮机空心静叶缝隙热气吹扫对二次水滴尺寸的影响,并结合数值方法分析了热气吹扫对叶栅气动性能的影响.试验结果表明:热气流吹扫使二次水滴的尺寸显著减小,尾缘处的缝隙吹扫对减小二次水滴的尺寸最明显,而压力面对二次水滴尺寸的影响最小,并且提高吹扫压比有助于提高吹扫效果.数值分析表明:压力面和吸力面吹扫缝隙后出现严重的流动分离;扩压区增大,使压力损失增大;尾缘吹扫需对叶片尾缘加厚,但这却导致了严重的尾迹损失;热气吹扫造成叶栅效率降低高达4%.
The effect of the heat steam blowing through the steam turbine hollow stator blades＇ slot on the size of secondary water droplets was studied on the air-water two-phase flow test rig. And the effect of the heat steam blowing on the aerodynamic performance of the blade cascade was analyzed by numerical simulation. The experimental results show that the size of the secondary water droplet is reduced greatly by heat steam blowing. Slot blowing from the trailing edge is most effective, while slot blowing from the pressure side is generally the least effective. To increase the blowing pressure ratio can make the heat steam blowing more effective. Numerical analysis results show that the serious flow separation occurrs on the downstream of the blowing slot on both pressure and sunction side, and the pressure loss increases due to the extended zone of pressure rising. Heat steam blowing at blade trailing will make the thickness of the blade trailing be increased, thus to cause serious wake loss. As a whole, by heat steam blowing, the cascade efficiency has a decrease up to 4 %.
出处
《动力工程》
CAS
CSCD
北大核心
2009年第7期635-639,共5页
Power Engineering
基金
国家高技术研究发展计划资助项目(2007AA05Z251)
关键词
汽轮机
热气吹扫
空心静叶
二次水滴
叶栅效率
数值计算
steam turbine
heat steam blowing
hollow stator blade
secondary water droplet
cascade efficiency
numerical calculation
