Study on Improvement of Fan Efficiency in Small Axial-Flow Fans : 1st Report, Designing a High Efficiency Fan by Using Numerical Optimization(Fluids Engineering)

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  • 小型軸流ファンの効率改善に関する研究 : 第1報,最適化手法による高効率ファンの設計(流体工学,流体機械)
  • 小型軸流ファンの効率改善に関する研究(第1報)最適化手法による高効率ファンの設計
  • コガタジクリュウ ファン ノ コウリツ カイゼン ニ カンスル ケンキュウ ダイ1ポウ サイテキカ シュホウ ニ ヨル コウコウリツ ファン ノ セッケイ

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A high efficiency small axial-flow fan was designed by using the design tool based on computational fluid dynamics and numerical optimization. For numerical optimization, a simulated annealing algorithm was applied to maximize fan efficiency. The optimized fan efficiency was increased by 17% compared to the initial fan. The initial fan was a conventional product designed by half vortex design. The differences in the blade shapes and the blade passage flow between the initial and optimized fans were investigated to analyze the causes of the fan efficiency improvement. The blade shape of the optimized fan had a different geometry to that of the initial fan in terms of the exit blade ange, solidity, and number of blades. By increasing the exit blade angle, the tip blade loading of the optimized fan was decreased compared to that of the initial fan. The decrease of the tip blade loading suppressed reverse flow and the increase of the deviation angle. The tip blade loading was found to have a great influence on the fan efficiency.

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