Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
AN OVERVIEW OF BLADE COOLING EFFECTS ON TURBINE PERFORMANCE
Submission Author:
Janaina Ferreira da Silva , SP
Co-Authors:
Janaina Ferreira da Silva, Ana Adalgiza Garcia Maia, Cleverson Bringhenti, Jesuino Takachi Tomita
Presenter: Janaina Ferreira da Silva
doi://10.26678/ABCM.COBEM2019.COB2019-0400
Abstract
The development of gas turbine has focused on more powerful and efficient engines. A way to improve engine performance is by increasing the Turbine Inlet Temperature (TIT). A limit in the performance improvement is imposed by the permissible metal temperature. Cooling techniques have been used to allow the engine running above the melting point of the material. Generally, a portion of air is bled from the compressor for cooling purposes. The cooling air flows through the internal blade channels extracting heat from the metal, being discharged into the hot gases through the holes on the blade surface, the blade tip, and the trailing edge. However, turbine blade cooling decreases engine performance when compared with the uncooled one. This adverse effect is mainly due to pressure losses and the reduction of the mainstream temperature and mass flow through the cooled turbine section. In this paper, a single cooled turbine stage and turbofan engine are simulated. A marked difference between uncooled and cooled results was found for performance and flow parameters. The results also demonstrated that the cooling technique substantially affects predicting cooling airflow. It highlights the importance of considering the cooling on performance estimation since preliminary phases.
Keywords
Gas Turbine, Engine Performance, Simulation, Blade cooling, Cooling technique
