The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Blade shape optimization of centrifugal fan for improving performance and reducing aerodynamic noise of clothes dryer

의류 건조기 성능 향상과 공력소음 저감을 위한 원심팬의 날개 형상 최적화

  • Received : 2019.03.27
  • Accepted : 2019.05.13
  • Published : 2019.05.31
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Abstract

The purpose of this study is paper is to improve the flow performance and to reduce the aerodynamic noise of air discharge system consisting of a centrifugal fan, ducts and a housing for the clothes dryer. Using computational fluid dynamics and acoustic analogy based on FW-H (Ffowcs-Williams and Hawkings) Eq., air flow field and acoustic fields of the air discharge system are investigated. To optimize aerodynamic performance and aerodynamic noise, the response surface method is employed. The two factors central composite design using the inflow and outflow angles of fan blades is adopted. The devised optimum design shows the reduction of turbulent kinetic energy in the ducts and the housing of the system, and as a result, the improved flow rate and reduce noise is confirmed. Finally, the experment using the proto-type manufactured usign the optimum design shows the increase of flow rate by 4.2 %.

본 연구의 목표는 의류 건조기용 원심팬과 덕트 및 하우징 등을 포함한 공기배출 시스템의 유량 성능 향상 및 공력소음을 저감하기 위한 것이다. 전산유체역학과 FW-H(Ffowcs-Williams and Hawkings) 방정식에 기초한 음향상사법을 이용하여 유동 및 소음 특성을 고찰하였다. 유량과 소음성능 최적화 설계를 위해 반응표면기법을 활용하였다. 설계 인자로 원심팬의 날개 입구각, 출구각을 고려한 2인자 중심합성계획법을 채택하였다. 도출된 최적설계안은 덕트와 하우징에서 감소된 난류에너지 분포를 나타냈으며 결과적으로 유량의 증가와 공력소음이 감소됨을 확인하였다. 최종적으로 최적설계안을 기초로 제작한 시제품에 대한 실험을 통하여 4.2 % 유량이 증가함을 확인하였다.

Keywords

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Fig. 1. Fan system of clothes dryer: fan, housing, inlet duct, and exhaust duct.

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Fig. 2. CAD model of target centrifugal fan.

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Fig. 3. Computational domain of fan system.

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Fig. 4. Integral surface for application of FW-H equation.

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Fig. 5. Schematics of flow rate experiment.

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Fig. 6. Optimization design factors.

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Fig. 7. Comparison of original & optimized fan blade.

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Fig. 8. Comparison of velocity magnitude.

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Fig. 9. Comparison of tangential-velocity.

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Fig. 10. Comparison of radial-velocity.

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Fig. 11. Comparison of sound pressure spectrum.

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Fig. 12. Turbulent kinetic energy of fan system.

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Fig. 13. Comparison of P-Q curve experiment.

Table 1. Blade inlet & outlet angle parameter.

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Table 2. Blade inlet & outlet angle parameter.

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References

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