摘要
采用标准k-ε湍流模型求解N-S方程,对多级轴流蒸汽轮机内部三维流场进行了数值模拟分析,得到相应的特性曲线与主要的参数分布。计算结果的分析表明,在设计点时流场较好;随着转速的降低,后面几级出现了不同程度的分离,尤其是在25%转速下,最后一级动静叶流场恶劣,这些都造成了不同程度的气流损失,导致了效率的降低;数值计算结果对进一步改进设计此类蒸汽轮机有一定参考价值。
Three dimensional inner flow filed numerical simulation was carried out for a multi-stage axial stream turbine through using k - ε turbulence mode Navier-Stokes equations were solved obtaining the corresponding characteristic curves and the distribution of chief parameters. The results of calculation indicated flow field is preferable at the design point, but when reducing the rotation speed there are different degree separations at the latter stages, specially at the 25% rotation speed the flow field of the last stage rotor and stator are harsh, this cause different degrees flow losses leading the reduction of efficiency. Numerical calculation has reference value for the future improvement design of such kind of turbine.
出处
《汽轮机技术》
北大核心
2010年第4期253-255,共3页
Turbine Technology
关键词
蒸汽轮机
数值模拟
工况特性
stream turbine
numerical simulation
working characteristic
