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팁 간격이 덕티드 팬의 공력 및 소음 성능에 미치는 영향에 관한 전산해석COMPUTATIONAL ANALYSIS OF TIP CLEARANCE EFFECT ON AERODYNAMIC AND ACOUSTIC PERFORMANCE OF THE DUCTED FAN

Other Titles
COMPUTATIONAL ANALYSIS OF TIP CLEARANCE EFFECT ON AERODYNAMIC AND ACOUSTIC PERFORMANCE OF THE DUCTED FAN
Authors
황유현김시진조규철명노신이학진
Issue Date
Dec-2023
Publisher
한국전산유체공학회
Keywords
전산유체역학(Computational Fluid Dynamics); 격자-볼츠만 법(Lattice-Boltzmann Method); 로터 공력성능 (Rotor Aerodynamic Performance); 공력 소음(Aerodynamic Noise); 덕티드 팬(Ducted Fan); 팁 간격(Tip Clearance)
Citation
한국전산유체공학회지, v.28, no.4, pp 106 - 116
Pages
11
Indexed
KCI
Journal Title
한국전산유체공학회지
Volume
28
Number
4
Start Page
106
End Page
116
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69140
ISSN
1598-6071
Abstract
A ducted fan offers improved safety by preventing object collisions and shielding the rotating blades. The tip clearance is an important parameter that can control the strong vortex generated at the rotating blade tips and impacts the performance. This study conducted computational analysis to investigate the effect of tip clearance on the aerodynamic performance and noise level of a ducted fan in hover condition using lattice-Boltzmann method (LBM) simulations. The tip clearance was defined as s/R = 1%, 2%, 4% using propeller radius(R), and computational analysis was conducted, including an propeller without duct. The thrust contribution of duct system was confirmed through the axial velocity field and surface pressure contour on ducted fan. Duct Shielding effect and aerodynamic noise level were investigated by comparing the overall sound pressure level (OASPL). Moreover, the directionality of noise propagation was observed using the instantaneous sound pressure field with various tip clearances. As a result, the strength of blade tip vortex increased as the tip clearance increased, thus leading to increase in tonal and broadband noise. It was concluded that a reduced tip clearance demonstrated enhanced noise reduction performance for the ducted fan.
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Lee, Hak Jin
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