• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.1041-1042
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• 2012

• 한국항공우주학회지
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• 제40권12호
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• pp.1017-1024
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• 2012

깃끝단 후퇴각을 가지는 최신 터보프롭 항공기의 프로펠러 블레이드에 대한 공력설계 및 해석을 수행하였다. 프로펠러 형상 설계를 위한 익형은 HS1 계열을 적용하였다. 와류-깃요소 이론(Vortex-Blade element theory)을 기반으로 하고 최소에너지 손실 조건을 만족하는 Adkins의 방법을 적용하여 Conventional 프로펠러 블레이드에 대한 공력설계 및 성능해석을 하였다. 목표 항공기의 설계점에서 코드 길이와 피치각을 변경해 가며 프로펠러 형상을 생성하였다. Conventional 프로펠러 블레이드 형상 정보를 기반으로 코드 길이, 깃끝단 후퇴각을 수정 적용하여 최신 프로펠러를 설계하였다. 전산유체역학을 이용한 설계된 최신 프로펠러 공력특성 분석을 통하여 최신 프로펠러가 적절하게 설계되었음을 확인하였다.

• 한국항공우주학회지
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• 제38권11호
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• pp.1060-1066
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• 2010

본 논문은 헬리콥터 로터 블레이드 플랜폼 설계를 위해 개발된 공력 최적설계 기법의 응용에 대한 내용이다. 블레이드 스팬 방향에 따른 익형의 배치, 비틀림 및 시위 등의 최적 분포를 결정하여 호버링 figure of merit과 고속 전진비행 시 등가 양항비를 최대화하는 설계문제를 정식화 하였다. 다양한 설계문제에 대해 최적설계 기법의 특성을 파악하였으며, 본 연구의 설계기법과 성능예측에 사용된 모델링 특성과 관련된 장점과 제한점에 대해 검토하였다. 보다 정확한 최적형상의 설계를 위해 요구되는 모델링 개선방향에 대한 검토와 향후 연구분야를 정의하였다.

• 동력기계공학회지
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• 제5권3호
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• pp.38-47
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• 2001

One stage axial type turbine is designed by mean-line analysis, streamline curvature method and blade design method using shape parameters. Tip and hub diameter of the turbine are 300mm and 206.4mm, respectively. The rotating speed is 1800RPM, and the output power is 1.4kW. The flow coefficient is 1.68 and the reaction factor at mean-line is 0.373. The number of stator and rotor of the turbine are 31 and 41, respectively. Mach number of stator exit flow near hub is 0.164. A test rig is developed for performance test to validate a developed design method. The experimental result shows that the maximum efficiency is obtained on the design point.

• 한국유체기계학회 논문집
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• 제14권2호
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• pp.47-51
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• 2011

This paper describes the shape optimization of a blower impeller used for a refuse collection system. Two design variables, which are used to define the blade angles of an impeller, are introduced to increase the blower performance. A blower efficiency is selected as an object function, and the shape optimization of the blade angles is performed by a response surface method (RSM). Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of object function for the training data. Relatively good agreement between experimental measurements and numerical simulation is obtained in the present study. Throughout the shape optimization, blower efficiency for the optimal blade angles is successfully increased up to 3.6% compared with that of reference at the design flow rate. Detailed flow field inside the turbo blower is also analyzed and discussed.

• 한국유체기계학회 논문집
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• 제19권2호
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• pp.16-20
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• 2016

Design optimization of a transonic compressor rotor(NASA rotor 37) was carried out using response surface method(RSM) which is one of the optimization methods. A numerical simulation was conducted using ANSYS CFX by solving three-dimensional Reynolds-averaged Navier Stokes(RANS) equations. Response surfaces that were based on the results of the design of experiment(DOE) techniques were used to find an optimal shape of blade which has the maximum aerodynamic performance. Two objective functions, viz., the adiabatic efficiency and the loss coefficient were selected with three design configurations to optimize the blade shape. As a result, the efficiency of the optimized blade is found to be increased.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.401-407
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• 2004

This study proposes a interim development result for the l-㎾ class small wind turbine system, which is applicable to relatively low wind speed regions like Korea and has the variable pitch control mechanism. In the aerodynamic design of the wind turbine blade, parametric studies were carried out to determine an optimum aerodynamic configuration which is not only more efficient at low wind speed but whose diameter is not much larger than similar class other blades. A light composite structure, which can endure effectively various loads, was newly designed. In order to evaluate the structural design of the composite blade, the structural analysis was performed by the finite element method. Moreover both structural safety and stability were verified through the full-scale structural test.

• 한국자동차공학회논문집
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• 제5권5호
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• pp.197-212
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• 1997

The performance of a torque converter can be expressed by the performance parameters such as flow radius and flow angle, on the mean flow path. The geometric analysis of the torque converter is required to determine these parameters for the modeling of the torque converter. In general, the blade shape is depicted by three dimensional data at the mid-surface of blade or those of the pressure and suction side. To generate three dimensional model of the blade using the data mentioned above, a consistent data format and a shape generation algorithm are required. This paper presents a useful consistent data format of the blades and an algorithm for the geometrical shape generation. By the geometric analysis program to which the shape generation algorithm is embedded, the variation of blade angles in rotating element analyzed. Then finally, the analyzed results of geometric profile of a blade are compared with those of the blade design principle, so called forced vortex theorem.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.63.2-63.2
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• 2011

The objective of this study is to investigate the aerodynamic characteristics of a small vertical axis wind turbine with dual blade type. The Wind turbine with dual blade has various angle of attack. so this turbine improve starting characteristics. The various arrangement of the vertical axis wind turbine with dual blade is designed. Among them, it shows superior quality that is arranged in three rows. Among arrangement in three rows, we use general computational fluid dynamics program CFX to find out the optimal arrangement. By comparing the predicted results of the aerodynamic characteristics of the different arrangement of the blades, an appropriate arrangement of the blade is suggested to design the small wind turbine blade.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.60.2-60.2
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• 2011

This study is to develop a 1kW-class small wind turbine blade which will be applicable to relatively low speed regions. For this blade, a high efficiency wind turbine blade is designed and a light and low cost composite structure blade is adopted considering fatigue life. In this study, shape design of 1kW-class small wind turbine blade for hybrid power generation system is carried out by BEMT(blade element momentum theory). X-FOIL open software was used to acquire lift and drag coefficients of the 2D airfoils used in power prediction procedure. Moreover, pressure and velocity distributions are investigated according to TSR by CFD analysis.