Combined cycle and partial load operating of modern heavy-duty gas turbines require highly efficient secondary air systems to supply both cooling and sealing air. Accurate performance predictions are then a fundamental demand over a wide range of operability. The paper describes the development of an efficient procedure for the investigation of gas turbine secondary flows, based on an in-house made fluid network solver, written in Matlab R environment. Fast network generation and debugging are achieved thanks to Simulink R graphical interface and modular structure, allowing predictions of the whole secondary air system. A crucial aspect of such an analysis is the calculation of blade and vane cooling flows, taking into account the interaction between inner and outer extraction lines. The problem is closed thanks to ad-hoc calculated transfer functions: cooling system performances and flow functions are solved in a pre-processing phase and results correlated to influencing parameters using Response Surface Methodology (RSM) and Design of Experiments (DOE) techniques. The procedure has been proved on the secondary air system of the AE94.3A2 Ansaldo Energia gas turbine. Flow functions for the cooling system of the first stage blade, calculated by RSM and DOE techniques, are presented. Flow functions based calculation of film cooling, tip cooling and trailing edge cooling air flows is described in details.

AN EFFICIENT PROCEDURE FOR THE ANALYSIS OF HEAVY DUTY GAS TURBINESECONDARY FLOWS IN DIFFERENT OPERATING CONDITIONS / Matteo Cerutti; Luca Bozzi; Federico Bonzani; Carlo Carcasci. - CD-ROM. - 4:(2010), pp. 1-1143. (Intervento presentato al convegno ASME TurboExpo tenutosi a Glasgow (UK) nel June 14-18) [10.1115/GT2010-22935].

AN EFFICIENT PROCEDURE FOR THE ANALYSIS OF HEAVY DUTY GAS TURBINESECONDARY FLOWS IN DIFFERENT OPERATING CONDITIONS

CARCASCI, CARLO
2010

Abstract

Combined cycle and partial load operating of modern heavy-duty gas turbines require highly efficient secondary air systems to supply both cooling and sealing air. Accurate performance predictions are then a fundamental demand over a wide range of operability. The paper describes the development of an efficient procedure for the investigation of gas turbine secondary flows, based on an in-house made fluid network solver, written in Matlab R environment. Fast network generation and debugging are achieved thanks to Simulink R graphical interface and modular structure, allowing predictions of the whole secondary air system. A crucial aspect of such an analysis is the calculation of blade and vane cooling flows, taking into account the interaction between inner and outer extraction lines. The problem is closed thanks to ad-hoc calculated transfer functions: cooling system performances and flow functions are solved in a pre-processing phase and results correlated to influencing parameters using Response Surface Methodology (RSM) and Design of Experiments (DOE) techniques. The procedure has been proved on the secondary air system of the AE94.3A2 Ansaldo Energia gas turbine. Flow functions for the cooling system of the first stage blade, calculated by RSM and DOE techniques, are presented. Flow functions based calculation of film cooling, tip cooling and trailing edge cooling air flows is described in details.
2010
ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
ASME TurboExpo
Glasgow (UK)
June 14-18
Matteo Cerutti; Luca Bozzi; Federico Bonzani; Carlo Carcasci
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/628305
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