• Title/Summary/Keyword: 재생형 블로워

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Characteristics of Leakage Flow on Regenerative Blower and Leakage-reducing Design for Performance Enhancement (재생형 블로워의 누설유동 특성과 누설유량 저감을 통한 성능 향상)

  • Choi, Min-Ho;Kim, Young-Hoon;Kang, Shin-Hyoung
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.4
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    • pp.57-63
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    • 2011
  • Regenerative blower is suitable for hydrogen recirculation in fuel cell vehicle due to its capability of high pressure rise in single stage. Numerical models were applied to investigate inner gap leakage flow characteristics. A leakage flow in the inner gap is dominantly affected by pressure gradient. Therefore a blower with concentric channel type was suggested as one of modified models for reducing the inner gap pressure gradient. Also numerical results such as pressure rise, efficiency, leakage flow rate and torque were compared between modified and reference models. The performance of concentric channel type was improved as a result of reduced leakage flow.

Development of Hydrogen Recirculation Blower for Fuel Cell Vehicle by Flow Analysis (유동해석에 의한 연료전지용 수소 재순환 블로워 개발)

  • Shim, Chang-Yeul;Hong, Chang-Oug;Kim, Young-Soo
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.684-689
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    • 2005
  • Parametric calculation were conducted to estimate performance of variable geometry of hydrogen recirculation blower for fuel cell vehicle. The pressure rise and efficiency are effected by change of the geometric parameter of impeller and casing, and stripper clearance under various mass flow. Hydrodynamic performance were evaluated, and also the inner flow fields were investigated by CFD. Calculated results show good coincidence with experimental test results of total pressure performance. Performance of model designed by parametric calculations satisfied experimental data of verification model.

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FLOW ANALYSIS AND PERFORMANCE EVALUATION OF HIGH PRESSURE DOUBLE STAGE RING BLOWER (고압 이단 링블로워의 삼차원 유동해석 및 성능평가)

  • Lee, K.D.;Kim, K.Y.
    • 한국전산유체공학회:학술대회논문집
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    • 2007.10a
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    • pp.45-48
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    • 2007
  • In the present work, flow analysis has been performed for side channel type double stage ring blower by solving three-dimensional Reynolds-averaged Navier-Stokes equation. Shear stress transport model is used as turbulent closure. The commercial CFD code CFX 11.0 is used for the calculations. Each of two stage is calculated separately and the second stage inlet flow is same as the first stage outlet flow so that consecutive calculation is possible. Velocity and pressure fields have been analyzed at the midplane between blades. The numerical results are validated with experimental data for head coefficients at different flow coefficients.

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FLOW ANALYSIS AND PERFORMANCE EVALUATION OF HIGH PRESSURE DOUBLE STAGE RING BLOWER (고압 이단 링블로워의 삼차원 유동해석 및 성능평가)

  • Lee, K.D.;Kim, K.Y.
    • Journal of computational fluids engineering
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    • v.12 no.4
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    • pp.85-89
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    • 2007
  • In the present work, flow analysis has been performed for side channel type double stage ring blower by solving three-dimensional Reynolds-averaged Navier-Stokes equation. Shear stress transport model is used as turbulent closure. The commercial CFD code CFX 11.0 is used for the calculations. Each of two stage is calculated separately and the second stage inlet flow is same as the first stage outlet flow so that consecutive calculation is possible. Velocity and pressure fields have been analyzed at the mid-plane between blades. The numerical results are validated with experimental data for head coefficients at different flow coefficients.

Visualization of Flow inside the Side Channel Type Regenerative Blower (사이드 채널형 재생블로워의 내부 유동 가시화)

  • Yang, Hyeonmo;Lee, Kyoung-Yong;Choi, Youngseok;Jeong, Kyungseok
    • The KSFM Journal of Fluid Machinery
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    • v.16 no.5
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    • pp.24-28
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    • 2013
  • Visualization of internal flow of a regenerative blower has been made by injecting a tracer directly into the flow. For the convenience of visualization, working fluid has been replaced by water and marbling color oil has been used as a tracer. Oil droplet has been injected near the inlet of the blower and the streak has been recorded using a high speed camera with the illumination of high power light sources. At first, droplets have irregular motion in the near inlet area and enter into a groove of the impeller. Then the droplets circulate inside the groove while translated by the rotational motion of the impeller. When the droplets get out of the impeller groove, their speed is lower than that of impeller. And the droplets repeatedly enter into the groove and circulate inside the grooves. Then the droplets either flow to the outlet or reenter into the inlet area through stripper. Through this experimental study, internally circulating motion of the flow inside a regenerative blower has been characterized.