• Title/Summary/Keyword: 스크롤 케이싱

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Numerical Simulation of Flows Inside Scroll Casing with Rotating Impeller (회전하는 임펠러를 포함한 스크롤 케이싱 내부 유동장의 전산 해석)

  • Kim J W.;Ahn E. Y.;Park J. W.
    • 한국전산유체공학회:학술대회논문집
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    • 2004.10a
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    • pp.65-68
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    • 2004
  • The design procedure for centrifugal blower with high inlet resistance is not presented yet. Overall fluid dynamic performance is estimated for comparison between the case of atmospheric inlet condition and the present model. Detail information between blades is prepared by using a commercial program, SCRYU-Tetra. A centrifugal blower with large inlet pressure is adopted in an air purifier having filtering devices. As the inlet residence increases the flow rate of the system is decreased. In parallel, outlet area of the system affects the performance of the system in the sense of flow balance. Consequently, the flow balance between the inlet and outlet becomes an important parameter for the design of the scroll casing for the centrifugal blower with high inlet pressure.

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Study on flows by turbofan without scroll casing (스크롤 케이싱이 없는 터보팬에 관한 연구)

  • Kim, Jae Won;Park, Jin Won;Oh, Jung Su;Ahn, Eun Young
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.590-595
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    • 2004
  • Turbo fan as an air moving device is widely used for its silent characteristics and high efficiency relative to the other centrifugal multi blade impeller. In general, turbo fan is installed with a scroll casing for energy conversion from kinetic one to pressure energy. However, a turbo fan without scroll casing is considered as a present model that is proposed model for compact design of a product In detail, the model has only 4 cutoffs as guiders for 4 separated outlets. Specially, equal distribution of flow rate generated by the model blower is main interest in this investigation. The optimal position of the guider is found by reducing abnormal flows such as reverse flow in each outlet.

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An Experimental Study of the Influences of Basic Design Parameters on the Performance and the Noise Characteristics of Cross-flow Fans (직교류 홴의 설계인자가 성능 및 소음 특성에 미치는 영향에 대한 실험적 연구)

  • 구형모
    • Journal of KSNVE
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    • v.10 no.3
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    • pp.430-436
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    • 2000
  • The cross-flow fans have been widely used to constitute the air moving systems in many air-ventilating and air-conditioning units. The cross-flow fan system has many design parameters which have crucial influence on the performance and the noise characteristics of the units. As a result there are many difficulties in the design stage of the system and the general design guide has not been sufficiently established yet. This study presents the experimental results of the parametric investigation of some chosen design parameters which are directly related to the shape of the stabilizer the profile of the scroll casing and the diffusion angle of the flow exit. The results are expressed in terms of the fan performance and the specific sound pressure level characteristics. Some parameters have been found to have crucial effects on the system performance/noise characteristics and should be considered with care in the design stage.

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Centrifugal Blower with High Inlet Resistance (고 흡입저항을 가진 원심 송풍기)

  • Kim, Jae-Won
    • The KSFM Journal of Fluid Machinery
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    • v.6 no.2 s.19
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    • pp.15-22
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    • 2003
  • Comprehensive study on a centrifugal blower for air-purifier involving a few physical filters for percolation process has been accomplished for an optimal design of the air handling system. The filtering media causes a flow resistance for induced flows by a rotating impeller. The present methodology is to adopt PIV system for velocity measurements and wind tunnel connected with an anechoic chamber for total performance test of the blower. Trial prototypes for the blades of a rotor and casing are presented for satisfaction of both flow rate and noise level set by design objectives. Tapered blades with a special casing for a fan show good performance data. The results of velocity fields also explain the reason of improvements of the blower performance.

Estimation of Noise Level near Cross Bow Fan by Measurements of Static Pressure. (정압을 이용한 직교류팬 주변의 소음 예측)

  • Kim, Jae-Won;Cho, Yong;Jung, Yoon-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.1156-1161
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    • 2001
  • A significant trial has been performed for estimation of noise level of a cross flow fan for air conditioning system. In general, measurements of noise level of machinery require rigorous equipment involving an anechoic chamber with precision gauges. The apparatus is expensive to utilize and is not easy to construct. In this work, we adopt static pressure sensing from an ordinary pressure transducer for prediction of noise level of a rotating fan. The present procedure is finding sound pressure from the static pressure by manipulating Light-Curle equation depicts noisy energy in terms of pressure on surfaces of noise generators. Sound power level near core unit of the fan is evaluated with the present methodology in a normal laboratory room without any sound absorbers. The method is easy and shows good prediction results compared with precise measurements by using microphones.

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Characteristics of Performance for Centrifugal Blower with Different Outlet Geometries (토출구의 형상에 따른 원심 송풍기의 성능특성)

  • Kim, Jae-Won;Kim, Jin-Min;Lee, Kook-Do
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.70-77
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    • 2004
  • Comprehensive investigation on the outlet's geometric shapes of a centrifugal blower with higher inlet resistance than an atmospheric pressure is carried out for improvements of its performance. Most unwanted behaviors of such blower are pulsating flows because of unbalance between inflows and outflows in a scroll casing. In order to reduce this undesirable phenomenon a triump is made for both the shape of outlet duct and an accessory structure inserted in the outlet port of the blower. The modification on the shape is concerned with the contraction of cross sectional area and the attached structure is for an intentional obstruction to cause a flow resistance. The details of the modification are examined for different cases and results. The methodologies for the work are performance evaluations including noise level and velocity measurements with PIV Consequently, the performance of improved system is close to that of the system operating with atmospheric pressure at the inlet.

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CFD Performance Analysis and Design of a 8kW Class Radial Inflow Turbine for Ocean Thermal Energy Conversion Using a Working Fluid of Ammonia (암모니아 작동유체를 이용한 해수온도차발전용 8kW급 구심터빈의 설계 및 CFD 성능해석)

  • Mo, Jang-Oh;Cha, Sang-Won;Kim, You-Taek;Lim, Tae-Woo;Lee, Young-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.8
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    • pp.1030-1035
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    • 2012
  • In this research, we analysed design and CFD analysis of an inflow radial turbine for OTEC with an output power of 8kW using an working fluid of ammonia. The inflow radial turbine consists of scroll casing, vain nozzle with 18 blade numbers and rotor blade with 13 blade numbers. Mass flow rate, and inlet temperature are 0.5kg/s and $25^{\circ}C$ respectively, and variable rotational speeds were applied between 12,000 and 36,000 with 3,000 rpm intervals. As the results according to the rotational speeds, the designed speed is 24,000 rpm where maximum efficiency exists. The maximum efficiency and output power are 88.66% and 8.52kW, respectively. Through this study, we expect that the analysed results will be used as the design material for the composition of the turbine optimal design parameters corresponding to the target output power under various working material conditions.