• Title/Summary/Keyword: 시로코 팬

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A Study on Three-Dimensional Flow Analysis and Noise Source of Sirocco Fan (시로코 팬의 3차원 유동해석 및 소음원에 관한 연구)

  • Kang, Jeong-Seok;Kim, Jin-Taek;Lee, Cheol-Hyung;Baek, Byung-Joon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.12
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    • pp.896-902
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    • 2018
  • This study examined the flow and noise inside a sirocco fan for ventilation as a commercial program. To confirm only the location and power of the noise source, flow analysis was performed with steady state flow analysis. Through flow analysis, the flow was observed in the sirocco fan and the velocity vector. The pressure distribution inside was observed with contours. From the results of steady analysis, the position and size of the noise source could be seen using the 'Curle surface acoustic power' and 'Proudman acoustic power'. The Curle surface acoustic power can be used to observe the noise from the surface. The Proudman acoustic power can be used to detect noise generated in the flow region because the position and size of the noise source generated inside the sirocco fan can be seen only in the steady state. Therefore it is necessary to further analyze the unsteady state to check the frequency of the noise generated. This study provides basic data for improving the performance of the Sirocco fan and reducing the noise.

Performance Improvement of Sirocco Fan using Design of Experiments (실험계획법을 이용한 시로코팬의 성능향상)

  • Choi, Young-Seok;Jung, Uk-Hee;Lee, Kyoung-Yong
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.283-286
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    • 2006
  • This paper presents a numerical study on the overall performance and local flow characteristics of the sirocco fan. The effects of impeller and volute shape distribution on the performance of the sirocco fan were numerically studied using a commercial CFD code and a DOE (design of experiments) software. At present, our attention was focused on the relation of the results of DOE and the performance of the sirocco fan. As a main result of the optimization, the performance of the sirocco fan was successfully improved. Also, detailed effects of geometric parameter of impeller and volute in the sirocco fan were discussed.

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Design Method of the Sirocco Fan Considering Aeroacoustic Performance Characteristics (공력음향학적 특성을 고려한 시로코 팬의 설계 방법)

  • Lee, Chan
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.2
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    • pp.59-64
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    • 2010
  • A design method of Sirocco fan is developed for constructing 3-D impeller and scroll geometries, and for predicting both the aerodynamic performance and the noise characteristics of the designed fan. The aerodynamic blading design of fan is conducted by blade angle, camber line determinations and airfoil thickness distribution, and then the scroll geometry of fan is designed by using logarithmic spiral. The aerodynamic performance of designed fan is predicted by the meanline analysis with flow blockage, slip and pressure loss correlations. Based on the predicted performance data, fan noise is predicted by two models for cutoff frequency and broadband noise sources. The present predictions for the performance and the noise level of actual fans are well agreed with measurement results.

Computational Analysis of the Three-Dimensional Flow Characteristics and the Performance of Sirocco Fan (시로코팬의 3차원 유동 특성 및 성능에 대한 전산해석)

  • 하재홍;문영준
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.12 no.7
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    • pp.674-679
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    • 2000
  • The Sirocco fan performance and its three-dimensional flow characteristics were numerically predicted by STAR-CD software. Turbulent flow computations were performed using approximately 500,000 mesh points, and the performance results of two computational methods, transient analysis and quasi-static analysis were compared with experimental data. At present, our attention was focused on localizing the three-dimensional flow characteristics of the Sirocco fin, especially the structure of the secondary flow in the scroll and the through-flow characteristics of the Sirocco fan blades. Also, for an optimization, the scroll passage was tilted with 10 degrees to change the flow characteristics and improve the performance of the Sirocco fan.

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A study on low-noise and high-efficiency sirocco fan development (저소음 고효율 시로코 팬 개발에 관한 연구)

  • Park, K.J.;Lee, S.H.;Son, B.J.
    • 유체기계공업학회:학술대회논문집
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    • 1998.02a
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    • pp.63-72
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    • 1998
  • This study Is on the performance prediction and design of sirocco fan. Slip coefficient is very important factor for the performance analysis of centrifugal-type fan. Because generally used slip coefficient equations of backward curved centrifugal fan are not appropriate for forward curved sirocco fan, in this study a proper slip coefficient equation for sirocco fan is suggested. Using this equation performance prediction program for sirocco fan is composed and also included the total noise prediction that include turbulent noise at the fan Inlet and boundary layer noise. A comparison between the values obtained from performance prediction program and experimental values shows that the program predicts the sirocco fan performance in a practical rate.

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An Experimental Study on Performance and Flow Characteristics of Automotive Sirocco Fan (자동차용 시로코팬의 성능 및 유동특성에 관한 실험적 연구)

  • 유성연;이대웅
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.11
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    • pp.954-963
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    • 2002
  • For the optimal design of an automotive blower system, effects of the scroll cut-off starting angle, the clearance between blade tip and bellmouth, and the scroll expansion angle on the performance of sirocco fan are investigated experimentally. Best performance is achieved at fan exposure ratio $\Deltae/r_c$,/TEX> =1.0, and clearance ratio $\DeltaeC/C=0.62. Flow characteristics inside sirocco fan are also studied by using LDV. Flow patterns in the inside of fan can be classified into three regions. Velocity vector has the same direction as rotational direction of fan at 0~$120^{\circ}$, toward the fan blades at 150~$180^{\circ}$, and opposite direction at 210~$330^{\circ}$. Turbulent intensity is relatively high near the cut-off edge in the scroll housing.

PERFORMANCE IMPROVEMENT OF A RANGE HOOD SIROCCO FAN BY CFD FLOW ANALYSIS (렌지후드의 성능개선을 위한 시로코 팬 주위의 유동해석)

  • Han, B.Y.;Park, J.W.;Lee, M.S.;Park, H.K.
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03a
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    • pp.159-165
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    • 2008
  • A sirocco fan is widely used for discharging pollutants of a kitchen space since it is able to generate a relatively high air flow rate considering its small size and makes less noise than a axial fan or a centrifugal fan. However, it has a problem because its efficiency is low, and power consumption is larger. Performance of a sirocco fan is influenced by various factors such as number of the fan blades, diameter of the fan, geometry of the fan, geometry of its housing, revolution frequency, static pressure condition, and etc. This research investigated the effect on the performance of geometry of the housing. For CFD analysis, we used a commercial code, SC/Tetra, and used a sliding mesh method to give the same condition as an actual state. Verification of the CFD results is done by comparison of experimental data and numerical one about the suction flow rate, and it is confirmed that two results are well consistent. After we changed the shape of housing according to Archimedes' screw, we observed that suction efficiency is improved by 10.7% maximum.

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ESPI를 이용한 에어콘용 시로코팬의 신뢰성평가

  • 김경석;강기수;양승필
    • Proceedings of the Korean Reliability Society Conference
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    • 2002.06a
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    • pp.253-260
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    • 2002
  • This paper propose Electronic Speckle Pattern Interferometry(ESPI) for reliability evaluation of electronic device. Especially, vibration problem in a fan of air conditioner, motor of washing machine and etc. is important factor to design the devices. However, it is difficult to apply previous method, accelerometer to the devices with lightweight and complex geometry. ESPI, non-contact measurement technique is applied for vibration analysis of a sirocco fan inside air conditioner. Vibration mode shapes, natural frequency and the range of the frequency are decided and compared with that of FEM analysis. In mechanical deign of new product, ESPI is able to supply effective design information.

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