In this paper, a multi-objective optimization of a transonic axial fan to enhance aerodynamic stability has been conducted using three-dimensional Reynolds-Averaged Navier-Stokes equations, surrogate modeling and multi-objective genetic algorithm (MOGA). Hub radius and first rotor chord length of the axial fan were chosen as design variables for the optimization. Peak adiabatic efficiency of the axial fan and stall margin at 60% of the designed rotational speed, were used as objective functions. Latin Hypercube Sampling (LHS) method was used to select design points in the design space. The objective functions were formulated using the response surface approximation (RSA) model. Three LHS samples with different distributions of twelve design points were tested to study their effects on prediction accuracy of the RSA model and optimization results. MOGA with the RSA models based on the best LHS sample, was used to obtain the Pareto-optimal front. As a result of optimization, an improvement of 17.2% in the stall margin at 60% of the designed rotational speed and 2.96% in peak adiabatic efficiency were obtained compared to the reference design. It was also found that distribution of the design points generated by LHS affects the effectiveness of the surrogate-based optimization.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4971-2
PROCEEDINGS PAPER
Optimization of a Two-Stage Transonic Axial Fan to Enhance Aerodynamic Stability
Arshad Afzal,
Arshad Afzal
Inha University, Incheon, Korea
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Kwang-Yong Kim,
Kwang-Yong Kim
Inha University, Incheon, Korea
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Wonsuk Lee
Wonsuk Lee
Hanwha Techwin, Seongnam-si, Korea
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Sang-Bum Ma
Inha University, Incheon, Korea
Arshad Afzal
Inha University, Incheon, Korea
Kwang-Yong Kim
Inha University, Incheon, Korea
Jaeho Choi
Hanwha Techwin, Seongnam-si, Korea
Wonsuk Lee
Hanwha Techwin, Seongnam-si, Korea
Paper No:
GT2016-56261, V02CT39A010; 10 pages
Published Online:
September 20, 2016
Citation
Ma, S, Afzal, A, Kim, K, Choi, J, & Lee, W. "Optimization of a Two-Stage Transonic Axial Fan to Enhance Aerodynamic Stability." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 2C: Turbomachinery. Seoul, South Korea. June 13–17, 2016. V02CT39A010. ASME. https://doi.org/10.1115/GT2016-56261
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