Multivariate Aero-thermal Optimization for Parameterized Oval Hole Cooling Layout on a Squealer Blade Tip
In order to further broaden the application prospect of the oval hole and parameterization combined inclination method on the squealer tip,the optimized multi-objective generic algorithm of multi-objective genetic algorithm guided by the reduced-dimensional Kriging surrogate model for updating the offspring population was established,and the local search strategy for the Pareto frontier was designed. With the design objectives of maximizing the cooling effectiveness and minimizing the leakage flow rate,coupled with the steady-state RANS numerical method,the multivariable optimization and analysis of the cooling layout on the squealer tip were carried out. The results show that the coupling of intense positive axial inclination and negative radial inclination of the oval hole significantly enhances the wall attachment performance and the film coverage,and the accumulation of jets downstream of the cavity assists to increase the local blocking effect at the rear of the cavity. Appropriate adjustment of the radial inclination of several cooling holes promotes further reduction of the leakage flow rate,while maintaining uniformity of cooling effectiveness and a wide range of film diffusion. The optimized structure improves the film cooling effectiveness by 436.3％ and the leakage flow rate is relatively reduced by 2.141％ compared to the round hole.
Gas TurbineSquealer TipOval HoleFilm CoolingOptimizationGenetic Algorithm
万方数据
维普
