Two-Phase Flow in Steam Turbines

Lecturer:

Tutor:

Supervisor:

Department of Energy Engineering

Synopsis:

Two-phase wet steam flow in steam turbines is responsible for efficiency decrease and blade erosion. The physical picture and mathematical model of condensing steam flow is introduced together with formation of coarse droplets responsible for blade erosion.

Requirements:

Basic knowledge on Gas dynamics, Thermodynamics and Steam and Gas Turbines from MS studies.

Syllabus of lectures:

Formation of wet steam during expansion in a convergent-divergent nozzle and in a steam turbine. Homogeneous and heterogeneous nucleation process. Critical droplet size and droplet growth-rate equation. Mathematical model of condensation in the flowing steam. Formation of coarse droplets in steam turbines. Additional energy losses in the wet steam. Causes of blade erosion, erosion-corrosion. Measures for preventing unfavourable effects of the steam moisture occuring in the fossil and nuclear steam turbines.

Syllabus of tutorials:

Study Objective:

Study materials:

Moore M.J., Sieverding C.H.: Two-Phase Steam Flow in Turbines and Separators: Theory,Instrumentation, Engineering.

Hemisphere Publishing corporation, 1976

Note:

Time-table for winter semester 2011/2012:

Time-table is not available yet

Time-table for summer semester 2011/2012:

Time-table is not available yet

The course is a part of the following study plans: