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송풍-역풍 겸용 축류팬 피치각에서 역풍시 효율저하 원인에 관한 연구
김화영(Hwa-Young Kim),허진혁(Jin-Huek Hur),문승재(Seung-Jae Moon),이재헌(Jae-Heon Lee),유호선(Hoseon Yoo),임윤철(Yun-Chul Im) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In this study, the numerical study has carried out to analyze the factors of the efficiency decrease at backward flow situation in an axial fan with adjustable blades. The analysis is carried out the pitch angle 36˚ on the forward flow and the pitch angle -26˚ on the backward flow. The numerical results show that the air flow rates of the pitch angle 36˚and -26˚ are respectively calculated to 285 CMM and 212 CMM. The results are similar to the experimental results carried out by Chang, and have made the maximum error of 10.6% when compared with the experimental results. The important reason of the fan efficiency decrease is that axial fan used for this study was designed to use for the forward flow. As the results, the pitch angle -26˚ has occurred the recirculation around the impeller blade, impeller cover and stator.
피치각 조정형 송풍-역풍 겸용 축류팬에서 배연용 피치각 선정을 위한 실험적 연구
장택순(Taek-Soon Chang),허진혁(Jin-Huek Hur),문승재(Seung-Jae Moon),이재헌(Jae-Heon Lee),유호선(Ho-Sun You),임윤철(Yun-Chul Im) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In this study, the experimental study has carried out to select pitch angle on the backward flow in an axial fan that has adjustable pitch blades. With the change of pitch angle of axial fan with adjustable blade, air flow rate, pressure and air flow direction can be changed. Because of this merit, adjustable axial fan can be used in the backward flow. For the selection of the backward flow pitch angle, fan performance test method is selected by KS B 6311. Dynamic pressure, static pressure, electric current and voltage are measured in each pitch angles of axial fan that are 36°, -16°, -21°, -26°, -31° and -36°. In the result of test, fan performance curves at several pitch angle has been investigated. Finally, pitch angle of -26° has been selected to get largest flow rate at backward flow situation.