LAUSR

Burners are the heating source of a gas turbine which are working at high temperatures and under high thermo-mechanical stresses. These components are always threatened by cracking and hot corrosion damages due to high-temperature working environment. In this study, the effects of employing thermal barrier coating and modified cooling system on the temperature distribution and the cracking phenomenon in a burner ring of a power plant gas turbine are investigated. Microstructural examinations on a ring without thermal barrier coating demonstrate that nitrogen uptake by the ring at high temperature leads to the formation of some undesirable phases. These phases, hot corrosion, and high thermal loads lead to cracking of the ring during turbine operation. Results show that both modification of cooling system and applying thermal barrier coating reduce ring temperature, but the latter has significant effect on reducing ring temperature and cracking phenomenon.