Blade cooling technology of heavy-duty gas turbines

In recent years heavy-duty gas turbine performance has undergone a continuous improvement. To further reduce the consumption of effective gases, the authors have proposed a steam-mist two-phase flow cooling scheme, under which turbine blades are cooled by mist-and-steam dual working media instead of air. The scheme in question has become the focus of study with each passing day. A great deal of research shows that the steam-mist cooling method enjoys a variety of merits, such as quick cooling, high cooling efficiency, small flow resistance and simple configuration etc., which will play a major role in the cooling of turbine blades of next-generation high performance gas turbines. A numerical simulation of the cooling process in an impingement gas-film structure has identified a significantly higher average cooling efficiency with the low temperature zone being extended remarkably.