• Title, Summary, Keyword: 팬-블레이드

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A study on the Structural Stability about the Fan Blade by the Air Excited Forces. (공기 가진력에 의한 팬 블레이드 구조 안정성 평가에 관한 연구)

  • 정규강;김경희;조생현
    • Journal of the Korean Society of Propulsion Engineers
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    • v.4 no.1
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    • pp.93-101
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    • 2000
  • In a gas-turbine engine, fan blades in flow path are confronted with many kinds of loading. The study of the excited force by the wake of struts has proposed and the possibility of fatigue failure about rotating fan blades by the excited force at the steady state is evaluated. Equations of the excited force of wakes has been derived at the steady state and the maximum pressure distributions measured at the transient state are proposed. Dynamic characteristics and the fatigue strength of fan blades by experimental test were obtained. To evaluate HCF(High Cycle Fatigue) damage of fan blades, FEM analysis was performed with a steady state harmonic response, which was followed by high cycle fatigue damage factor from goodman diagram.

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Cooling Performance of PC cooling Fan For Various Cooling Fan Blade numbers and Design Shapes (PC용 냉각팬의 형상 및 블레이드의 수 변화에 따른 냉각성능)

  • Park, Won-Keol;Lee, Dong-Ryul
    • Proceedings of the KAIS Fall Conference
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    • pp.685-689
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    • 2012
  • 본 연구는 PC용 냉각팬의 효율적인 설계를 위하여 냉각팬의 형상 변경 및 블레이드의 수 변화를 통해서 PC 부품 발열체의 온도변화를 수치해석적으로 수행하였다. 기존의 냉각팬 형상을 기준으로 블레이드의 수를 변화시키고 실제 형상을 변경한 냉각팬을 동일한 설계 입력조건를 적용하여 비교 분석하여 냉각성능을 파악하였다. 두 Case를 비교한 결과 기존 형상은 블레이드의 수가 증가 할수록 냉각효과가 커졌고, 형상을 변경한 냉각팬의 경우 Blade 6에서 가장 큰 냉각 효과를 보였다. 그리고 Blade 6과 8을 비교해 봤을 때 두 블레이드 사이에서 온도차이는 미소한차이로 냉각효과를 비교하기 어려웠다. 두 Case에서 제작과정과 비용을 비교해 보았을 때 Case 2의 Blade 6 경우가 더 우수한 것으로 보아 형상을 변경한 블레이드에서 최적설계를 얻을 수가 있었다.

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Characteristics of Flow-Induced Noise in the Suction Nozzle of a Vacuum Cleaner with a Double-Blade Fan (이중 블레이드 팬이 장착된 진공청소기 브러쉬의 유동소음 특성)

  • Park, I-Sun;Sohn, Chae-Hoon;Oh, Jang-Keun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.2
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    • pp.205-213
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    • 2011
  • The characteristics of noise generation in the suction nozzle of a vacuum cleaner are analyzed numerically and experimentally. First, the flow resistance induced by each element in the suction nozzle of a vacuum cleaner with a double-blade rotary fan is investigated numerically and its relation with flow-induced noise and suction performance is examined in an anechoic room. The flow resistance and vorticity in the suction nozzle are calculated, and it is found that they are closely related to flow-induced noise and that the upper limit of noise reduction is only 4 dBA. This upper limit can be achieved by changing the design of the brush nozzle. Two methods for noise reduction by enlargement of flow-inlet area and by optimization of the number of blades are tested. Finally, the effects of each method are verified experimentally.

Dynamic Characteristics of Ducted Fan: A Study (덕트 팬의 동특성 연구)

  • Baek, Sang Min;Kwon, Jae Ryong;Rhee, Wook
    • Journal of Aerospace System Engineering
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    • v.11 no.6
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    • pp.84-91
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    • 2017
  • The dynamic characteristics of a ducted fan in hovering condition were investigated. The section properties of the fan blade were calculated, and a simulation model was developed according to the rotor system components. Dynamic analyses were conducted relative to the rotational speed and the collective pitch. The proposed ducted fan system showed less aero-elastic instability within the designated operating ranges. To verify the analytical approach, a rotating test stand of the ducted fan was set up. A functional test of the assembly was carried out to determine the kinematics and interference between components. The non-rotating and rotating normal frequencies were measured by excitation of the collective pitch using hydraulic actuators. The results indicated a correlation between the test equipment and the simulation model.

Numerical Analyses on the Aerodynamic Characteristics of an Axial Type In-line Duct Fan (축류식 In-line duct fan의 공력특성에 관한 전산해석)

  • Cho, Lee-Sang;Ahn, Kwang-Weon;Cho, Jin-Soo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.4
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    • pp.1-11
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    • 2004
  • Numerical analyses on the aerodynamic characteristics of a counter rotating axial flow fan were conducted for the development of an axial type in-line duct fan. The counter rotating fan has a front rotor and a rear rotor which are counter rotating each other. Blade design of the counter rotating fan was done by extension of design method for axial flow fan which consists of rotor and stator blades. Through flow analysis was performed using matrix method which is applied for flow fields prediction of compressors or turbines. Aerodynamic characteristics and characteristic curves of the counter rotating fan were analyzed by expansion of the frequency domain panel method with duct modeling. Pressure losses were higher at leading edge and hub region of rotor blades. Characteristic curve of the counter rotating fan was overpredicted without consideration of viscous effect.

Dynamic Modeling and Stabilization of a Tri-Ducted Fan Unmanned Aerial Vehicles using Lyapunov Control (삼중 덕티드 팬 비행체 운동모델링 및 리아푸노프 제어를 이용한 안정화)

  • Na, Kyung-Seok;Won, Dae-Hee;Yoon, Seok-Hwan;Sung, Sang-Kyung;Ryu, Min-Hyoung;Cho, Jin-Soo;Lee, Young-Jae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.7
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    • pp.574-581
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    • 2012
  • Because of the exposed blade, the UAV using the rotors entail the risks during operation. While a wrapped duct around the fan blades reduces risks, it is a higher thrust performance than the same power load rotor. In this paper, for applying advantages of a ducted fan, the tri-ducted fan air vehicle configuration is proposed. The vehicle has three ducted fans. Two of them are the same shape and size and the third one is the smaller. It is possible to control a rapid attitude stability using thrust vector control. The equations of motion of the tri-ducted fan were derived. Lyapunov control input was applied to the system and stable inputs were derived. A nonlinear simulation was fulfilled by using parameters of a prototype vehicle. It verified a stable attitude and analyzed results.

Predictions of Rotor and Fan noise in the Frequency Domain (주파수 영역에서 로터 및 팬의 소음 예측)

  • 정춘면;박승철;이덕주
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.111-116
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    • 1991
  • 주파수 영역에서 로터의 thickness noise는 블레이드의 여러가지 기하학적인 조건, 즉 블레이드 수, 블레이드의 사잇각, 에어포일의 모양 그리고 반경방향의 블레이드 끝모양에 따라서 해석되어진다. 본 논문은 비 등간격 로터의 기하학적 조건에 따른 음신호의 위상간섭 영향을 고찰하기 위해서 등간격을 이루는 로터에 대해서 해석된 Hanson의 방법을 확장하였다. thickness noise를 6개의 블레이드를 가진 로터에 대하여 15.deg., 30.deg., 45.deg., 비 등간격을 이루는 경우와 각각에 45 tip angle로 sweepback되었을 때 먼 거리의 음향학적 음신호와 그 스펙트럼을 계산하였다.

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Optimal Design of the Stacking Sequence on a Composite Fan Blade Using Lamination Parameter (적층 파라미터를 활용한 복합재 팬 블레이드의 적층 패턴 최적설계)

  • Sung, Yoonju;Jun, Yongun;Park, Jungsun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.6
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    • pp.411-418
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    • 2020
  • In this paper, approximation and optimization methods are proposed for the structural performance of the composite fan blade. Using these methods, we perform the optimal design of the stacking sequence to maximize stiffnesses without changing the mass and the geometric shape of the composite fan blade. In this study, the lamination parameters are introduced to reduce the design variables and space. From the characteristics of lamination parameters, we generate response surface model having a high fitness value. Considering the requirements of the optimal stacking sequence, the multi-objective optimization problem is formulated. We apply the two-step optimization method that combines gradient-based method and genetic algorithm for efficient search of an optimal solution. Finally, the finite element analysis results of the initial and the optimized model are compared to validate the approximation and optimization methods based on the lamination parameters.

Performance/Noise Optimization of Centrifugal Fan Using Response Surface Method (반응표면법을 이용한 원심팬 성능/소음 최적화)

  • Shin, Donghui;Heo, Seung;Cheong, Cheolung;Kim, Tae-Hoon;Jung, Jiwon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.3
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    • pp.165-172
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    • 2017
  • In this study, centrifugal fan blades used to circulate cold air inside a household refrigerator were optimized to achieve high performance and low noise by using the response surface method, which is frequently employed as an optimization algorithm when multiple independent variables affect one dependent variable. The inlet and outlet blade angles, and the inner radius, were selected as the independent variables. First, the fan blades were optimized to achieve the maximum volume flow rate. Based on this result, a prototype fan blade was manufactured using a 3-D printer. The measured P-Q curves confirmed the increased volume flow rate of the proposed fan. Then, the rotation speed of the new fan was decreased to match the P-Q curve of the existing fan. It was found that a noise reduction of 1.7 dBA could be achieved using the new fan at the same volume flow rate.

Optimal Design using Flow-structure Interaction Analysis Method of Engine Generator Cooling Fan (엔진발전기 냉각팬의 유동-구조 연성해석 기법을 이용한 최적설계)

  • Kim, Seung Chul
    • Journal of the Korean Institute of Gas
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    • v.24 no.3
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    • pp.47-53
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    • 2020
  • In this study, the optimization design data was presented by analyzing the performance and durability of the cooling fan by one-way fluid-structure interaction analysis of the cooling fan shape used in the engine generator. For this purpose, a steady-state analysis was performed on the flow field inside the cooling fan, and the durability was analyzed by using the steady-state calculation results as input data for structural analysis. Six types were modeled for fluid analysis by changing the blade and sweep angle of the cooling fan, and the ratio of mass flow rate and torque was best in A type, but B type with relatively large mass flow rate was the best. It was judged to have flow performance. As a result of examining the structural analysis by setting the four blade thickness of the B type selected through the fluid analysis, it was judged that B Type-3 is the most suitable when considering the fatigue safety factor.