• 제목/요약/키워드: 프로펠러 홴

검색결과 4건 처리시간 0.024초

전향 스윕 프로펠러 홴의 성능 및 유동특성 (Performance and Flow Characteristics of a Forward Swept Propeller Fan)

  • 김진권;강신형
    • 대한기계학회논문집B
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    • 제24권1호
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    • pp.75-84
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    • 2000
  • Performance and flow characteristics of a small forward swept propeller fan for home refrigerators are studied experimentally. An unusual discontinuity is observed in the performance curve of the fan. Mean flow fields measured with as-hole Pitot probe reveal that the flow is axial at the high flow rate and radial at the low flow rate. The flow structure changes abruptly across the discontinuity. Unsteady flow measurements with a set of hot-wire probes indicate that near the discontinuity a single-cell stall rotates at 40% speed of the fan speed, while away from the discontinuity the flow shows periodic variation corresponding to the blade passage frequency. Phase-lock averaged flow fields measured with a triple-sensor hot-wire probe show that there appears radially inward flow over the pressure side of the blade and the outward passage flow over the tip.

프로펠러 홴 날개 위의 역류 유동 (Reverse Flow on Blade-Surface of Propeller Fan)

  • 김재원;남임우
    • 한국유체기계학회 논문집
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    • 제4권2호
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    • pp.7-14
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    • 2001
  • Design and development of a propeller fan for a cooling tower have been accomplished by both numerical prediction of performance and experimental validation with a wind tunnel. Main interest lies on blade geometry of a fan for optimal design of aerodynamic performance. A commercial program, Fine/Turbo used for the present numerical estimation, gives us engineering information such as flow details near the blades and flow rate of the system. The numerical results are compared with precise experimental output and show good agreement in comparison between the two data. Also new proposed model of a blade shows improved performance relative to present running model in market.

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불균일 난류 유입유동이 프로펠러형 송풍기의 톤소음에 미치는 영향에 대한 실험적 연구 (An Experimental Study on the Effects of Non-uniform Inlet Flows upon Tonal Radiation from an Axial-type Propeller Fan)

  • 이승배;김광용;양귀철
    • 한국유체기계학회 논문집
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    • 제1권1호
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    • pp.49-57
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    • 1998
  • The acoustic signatures from a propeller fan under non-uniform inlet flow conditions were measured to reveal the mechanism for tonal radiation. Experimental studies were carried out by generating non-uniform turbulent flows with circumferential and radial components of harmonic incoming gust deliberately. This paper reports the measured acoustic power exponents and cross-spectra for circumferential and radial disturbances at a specified flow-rate coefficient.

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