A study of the throughflow of nucleating steam in a turbine stage by a time-marching method

被引:8
|
作者
Bakhtar, F. [1 ]
Mohsin, R. [2 ]
机构
[1] Univ Birmingham, Sch Mech Engn, Birmingham B15 2TT, W Midlands, England
[2] Univ Teknol Malaysia, Gas Technol Ctr GASTEG, Johor Baharu, Malaysia
关键词
Steam turbines; nucleation; throughflow; time marching; two-phase flows; wet steam; non-equilibrium flow; 2-DIMENSIONAL 2-PHASE FLOWS; WET STEAM; NOZZLE BLADES; CASCADE; PERFORMANCE; MODEL; CONDENSATION; DESIGN;
D O I
10.1177/0954406213490873
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In the course of expansion in turbines, steam first supercools and then nucleates to become a two-phase mixture. The fluid then consists of a very large number of extremely small droplets which are carried by and interact with the parent vapour. The formation and subsequent behaviour of the liquid phase cause problems which lower the performance of the wet stages of steam turbines. To treat such flows the general conservation equations governing the whole field are combined with those describing droplet nucleation and growth and the set treated numerically. The article examines the solution of throughflows of nucleating steam in a turbine stage using a time-marching technique. The treatment which is the refinement of an earlier one has been applied to the flow in a turbine stage. Comparisons are presented between the results of theoretical solutions and direct measurements upstream and downstream of the nucleating stage and the agreement obtained is good.
引用
收藏
页码:932 / 949
页数:18
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