摘要
建立刷式汽封数值计算模型,分析刷毛直径、刷毛密度及刷毛与轴的间隙对刷式汽封性能的影响,对刷式汽封进行优化设计。结果表明:减少刷毛直径、增加刷毛密度、降低刷毛与轴的间隙,可降低刷式汽封的气流的泄漏量,提高其效率;优化设计的刷式汽封的直径为0.11～0.13mm,密度为每厘米汽封刷子中含有细金属丝1900～2400根,刷毛与轴的间隙为0.4～0.5mm;刷毛齿形做成尖锐边缘时,流量系数较小,从而可减小泄漏量。
A new structure of seal brush seal was put forward,the calculation model was built.The structure parameters were optimized by changing the diameter of a brush,the density of brush,and the gap between brush bristles and the axis.The results show that decreasing the diameter of a brush,increasing the density of brush or decreasing the seal gap can improve the seal performances and the steam turbine’s internal efficiency.The optimum diameter of a brush is between 0.11 to 0.13 mm.The optimum density of brush seal is 1 900 to 2 400 brushes per centimeter.To decrease the leakage of brush seal,the tip of brush should have sharp edge.
出处
《润滑与密封》
CAS
CSCD
北大核心
2010年第5期70-73,共4页
Lubrication Engineering
基金
国家自然科学基金项目(50706025)
上海市科委地方院校能力建设项目(08160512400)
关键词
汽轮机
汽封
刷式密封
steam turbine
gland seal
brush seal
