Dynamics of Unsteady Tip Leakage Vortex in a Transonic Fan

Prashanth, Mohit Nahar; Farokhi, Saeed; Taghavi, Ray

doi:10.2514/6.2019-1185

Cited by 1 publication

(1 citation statement)

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“…With rapid advances in CFD and computing hardware, CFD-based research on the fast and reliable evaluation of compressor boundary layer blockage and the mechanism of blockage formation has made great progress (Khalid et al , 1999; Zheng and Yang, 2017; Prashanth et al , 2019). Meanwhile, the boundary layer blockage attenuation-based aerodynamic design method becomes a concrete opportunity.…”

Section: Introductionmentioning

confidence: 99%

An overall blockage attenuation-based aerodynamic performance and stability design optimization method for transonic axial flow compressors

Wang

Sun²,

Benini³

et al. 2022

HFF

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Purpose This study aims to use computational fluid dynamics (CFD) to understand and quantify the overall blockage within a transonic axial flow compressor (AFC), and to develop an efficient collaborative design optimization method for compressor aerodynamic performance and stability in conjunction with a surrogate-assisted optimization technique. Design/methodology/approach A quantification method for the overall blockage is developed to integrate the effect of regional blockages on compressor aerodynamic stability and performance. A well-defined overall blockage factor combined with efficiency drives the optimizer to seek the optimum blade designs with both high efficiency and wide-range stability. An adaptive Kriging-based optimization technique is adopted to efficiently search for Pareto front solutions. Steady and unsteady numerical simulations are used for the performance and flow field analysis of the datum and optimum designs. Findings The proposed method not only remarkably improves the compressor efficiency but also significantly enhances the compressor operating stability with fewer CFD calls. These achievements are mainly attributed to the improvement of specific flow behaviors oriented by the objectives, including the attenuation of the shock and weakening of the tip leakage flow/shock interaction intensity. Originality/value CFD-based design optimization of AFC is inherently time-consuming, which becomes even trickier when optimizing aerodynamic stability since the stall margin relies on a complete simulation of the performance curve. The proposed method could be a good solution to the collaborative design optimization of aerodynamic performance and stability for transonic AFC.

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Section: Introductionmentioning

confidence: 99%