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고 흡입 저항을 갖는 원심형 송풍기의 성능 향상에 관한 연구 원문보기
(An) Investigation on the Performance Improvement of Centrifugal Blower with High Inlet Resistance

  • 저자

    이국도

  • 학위수여기관

    鮮文大學校 大學院

  • 학위구분

    국내박사

  • 학과

    기계공학과 유체기계 전공

  • 지도교수

  • 발행년도

    2004

  • 총페이지

    xiii, 115p.

  • 키워드

    고흡입저항 원심형송풍기 성능향상;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10064883&outLink=K  

  • 초록

    Comprehensive investigation on centrifugal blower is investigated for the optimal design of an air moving unit adopted in an air purifier with physical and electric filters for its inherent purpose. Centrifugal blower has large applications to industry and home appliance products. The application field becomes larger and larger as the industry is going on developing. Specially, the use of the blower is possible for the case of air purifiers with high inlet resistance for filtering process. It is necessary to consider an improved design method under the unfavorable situation mentioned above. This is the main motivation of this investigation. The present methods of this research are using computational tools for numerical calculation for the flows in the system and performance estimation with wind tunnel. The models of two kinds of blades with forward and backward one are prepared at the different operating conditions; one is for normal running blower at atmospheric pressure and the other for operating with high inlet resistance. The flows are different with those in the blower with an inlet opens atmospheric pressure. The performance including noise level and efficiency of the blower with high inlet resistance decreases due to the reduced inflows that are caused by high inlet resistance. In addition, the flow unbalance becomes a major reason of unwanted circulating flows inside the system. In order to improve the poor performance of the blower with the high inlet resistance, a treatment on the scroll casing of the blower is proposed. The triumph is concerned with the intentional addition of a structure in the outlet passage, the type of outlet duct, and the position of the cut off of the casing. The three modifications are contrived to increase the performance of the blower. This is the main improvement of this investigation. The present methods of this research are using PIV (Particle Image Velocimetry) for the flows in the system and performance estimation with wind tunnel. Main interest lies on the additional structures for removing abnormal flows at the outlet of the blower and the position of the cut off. Considered assistant structure is a circular cylinder inserted in a scroll casing for control of outlet resistance by adjustments of the position of the circular cylinder. Several positions for the inserted cylinder are examined for the effects on the flow stability that is identified by the absences of reverse flows. The out flows are measured by PIV and hot wire anemometer and used for the decision of the effects of the inserted cylinder whose size is fixed as a 5% of the impeller diameter. Another triumph is concerned with the angle of the outer wall of the casing. Considered models are distinguished by both the out duct angles from 90 degree to 75 degree with the increment of 5 degree and the cut off positions. The flows are different with those in the blower with an inlet opens atmospheric pressure. The performance including noise level and efficiency of the blower with high inlet resistance decreases due to the reduced inflows that are caused by high inlet resistance. In addition, the flow unbalance becomes a major reason of unwanted circulating flows inside the system. In order to increase the flow rate of the blower with the high inlet resistance, a treatment on the scroll casing of the blower is proposed. The modification for the blower is concerned with the looking for an optimal position of the cutoff of the casing converting kinetic energy to pressure energy. Three different casings of the triumph are presented for the comparison of the improved effects on the performance. Optimal model for the casing with high inlet resistance is found through the comparison of the performance of the system and flow velocity distribution near the outlet. Series of figures for flow information are prepared for deep understanding of the centrifugal blower with high inlet resistance.


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