INVESTIGADORES
FACHINOTTI Victor Daniel
congresos y reuniones científicas
Título:
Optimization of ventilation holes in an aeronautic turbine hole
Autor/es:
ALEJANDRO ALBANESI; JOSÉ RISSO; VICTOR D. FACHINOTTI; ALBERTO CARDONA
Lugar:
Santa Fe
Reunión:
Congreso; XV Congreso sobre Métodos Numéricos y sus Aplicaciones (ENIEF 2006); 2006
Institución organizadora:
Asociación Argentina de Mecánica Computacional (AMCA)
Resumen:
Ventilation of turbine blades is used in aeronautic jet engines to increase the gas temperature inside the turbine, without incrementing the blades temperature beyond certain limits and thus preserving their expected lifetime. Ventilation is achieved by taking cold air from the compressor and passing it through holes in a rotating disc previous to the turbine. The shape of the hole plays a major role in the air flow and in the stress distribution of the disc.
Numerical optimization techniques were used to solve this problem. These methods provide a computational tool for design and a systematic approach to take design decisions that previously relied more on experiments and intuition. Classical optimization algorithms usually minimize an objective function under certain design constraints, by varying the design variables within prescribed bounds. The optimization algorithms use information computed by other analysis software to recalculate the design variables at each iteration.
The objective of the present study is the optimization of the shape of the ventilation hole in order to maximize the cross section area of the air channel and to minimize the equivalent stress in the surroundings of the hole. In order to perform the optimization, a parametric model of the disc was created. Several alternatives for defining the optimization problem were evaluated, and a final mechanical design was proposed that takes full account of the three-dimensional features of the problem.
The analysis was performed using the software Samcef. BOSS/Quattro was the optimization module, while the mechanical analysis was made using Mecano and Asef modules (nonlinear and linear modules, respectively) to carry out the coupled thermo- mechanical analysis.