• 제목/요약/키워드: 깃이 없는 디퓨저

검색결과 4건 처리시간 0.016초

반경류형 회전차를 가진 원심송풍기의 깃이 없는 디퓨저 내의 선회실속에 관한 실험적 연구 (An Experimental Study on the Rotating Stall in Vaneless Diffuser of Centrifugal Blower with Radial Type Impeller)

  • 김진형;조강래
    • 대한기계학회논문집B
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    • 제22권9호
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    • pp.1247-1254
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    • 1998
  • The vaneless diffusers are widely used in industrial centrifugal compressors which are required to operate within a wide flow range. When very high pressure gases are handled by centrifugal compressor. rotating stall is a serious problem because of the occurance of large aerodynamic exciting forces. Rotating stall mostly often occurs in the impellers but it can occur in vaneless diffusers as well. In this experimental study, the rotating stall in vaneless diffuser with radial type centrifugal impeller was measured by changing the flow rate with I-type, X-type hotwire. As the result, it was cleared which type of rotating stall of the impeller stall would occur and how many stall cells would appear relating with the flow rate. As the flow rate reduced, the propagation speed of rotating stall was reduced. But the stall cell number unchanged with respect to the flow rate.

PIV측정에 의한 깃 없는 디퓨저에서의 유동특성 (The Flow Characteristics in a Vaneless Diffuser by PIV Measurements)

  • 윤지인;신유환;이윤표;김광호
    • 한국유체기계학회 논문집
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    • 제15권2호
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    • pp.45-50
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    • 2012
  • The flow characteristics in a vaneless diffuser with a backswept radial impeller have been experimentally investigated according to the variation of discharge flow rate. Particle image velocimetry(PIV) system was applied to measure velocity fields with several operating conditions and on some diffuser horizontal planes. Pressure transducers were installed on hub wall of the diffuser in order to analyze the pressure fluctuations and their corresponding velocity fields. The results show that the location of the main flow center moves from the hub to the shroud side as the flow rate decreases, and the reverse flow is locally generated on the hub side.

전산해석을 통한 원심압축기용 디퓨저의 폭변화에 따른 성능 연구 (PERFORMANCE BY WIDTH CONTRACTION IN VANELESS DIFFUSER OF CENTRIFUGAL COMPRESSOR BY COMPUTATIONAL FLUID DYNAMICS)

  • 이상철;이원석;신유환;정진택
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2010년 춘계학술대회논문집
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    • pp.136-141
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    • 2010
  • This study describes effects of width contraction in vaneless diffuser on the performance of centrifugal compressors using commercial CFD code. Numerical analysis for three different diffusers such as Parallel, half contraction, and full contraction was performed. The results show that the performance of the centrifugal compressor is improved through the use of the diffusers with width parallel in high flow rate. The width contraction of diffusers is influenced static pressure rises. Comparison with the experimental data shows agreement.

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원심펌프의 회전차 출구 유동에 관한 실험적 연구 (An Experimental Study on the Flow at the Impeller Exit of a Centrifugal Pump)

  • 강신형;홍순삼
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 1999년도 유체기계 연구개발 발표회 논문집
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    • pp.234-241
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    • 1999
  • The flow at the impeller exit is important to validate engineering design and numerical analysis of pumps. However, it is not easy to measure the flow at the impeller exit and evaluate the impeller performance since there is usually strong interaction between the impeller and the volute casing. We installed axisymmetric collector instead of the volute casing, so there is no interaction between the impeller and casing. A 3-hole Cobra probe is used to investigate the flow at impeller exit and vaneless diffuser region for design and on design flow rate. For a single suction centrifugal pump of low specific speed, the flow field such as velocity, flow angle, and total pressure are measured by traversing the probe across the vaneless diffuser. These data can be used for performance prediction, desist and numerical analysis of pumps.

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