Study on water extraction of hollow stationary blade under wet steam flow conditions

Abstract

In addition to mechanical losses, such as interphase drag loss, braking loss and pumping loss 1 , the presence of wetness in steam turbine can also lead to many additional losses in thermodynamics, profile, shock wave and blade end, etc. The additional thermodynamics loss is caused by nonequilibrium condensing flow where the rapid-expansion pure steam will be in supercooled state, and the heat transfer process is anisothermal 2 . Many experimental and numerical investigations on nonequilibrium condensing flow have been conducted for years, where the classical condensation theory and the growth rate of water droplets have been validated and studied in Laval nozzles 3-5 and turbine cascades [6][7][8] . Moreover, experiments have been carried on in model or full-scale LP steam turbines

Numerical and experimental study of droplet-film-interaction for low pressure steam turbine erosion protection applications

“…(3) Braking losses are generated by large droplets which impinge on the surfaces of moving blades and thus reduce the amount of work. (Gyarmathy, 1962;Kreitmeier et al, 2005;Kawagishi et al, 2013;Starzmann et al, 2014;Wu et al, 2017).…”