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遠心 임펠러의 相對 渦流 크기 모델에 根據한 이론적인 미끄럼 係數
팽기석,정명균,Paeng, Kee-Seok,Chung, Myung-Kyoon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.3
By calculating the location and size of the relative eddy formed in the rotating impellers with the logarithmic spiral vanes, a new simple but accurate slip factor is analytically derived. The proposed slip factor depends on only one parameter that is a function of the number of vanes and the vane exit angle. Predicted slip factor for various cases are compared with those estimated by a number of previous slip factors as well as a recent theoretical calculation by Visser et al. ( JFM, Vol. 268, pp. 107-141, 1994). It is found that the present slip factor yields almost similar results to Wiesner's which has been empirically formulated based on the theoretical calculation of Busemann.
팽기석(Kiseok Paeng),안철주(Chulju Ahn),민성기(Seongki Min),김유일(Yuil Kim) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
추력 150 lbf 급의 초소형 터보제트 엔진이 개발되었다. 본 엔진은 소형 무인항공기(UAV), 기만기, 대공망 제압용 유도무기 등 다양한 무기체계에 적용이 될 수 있도록 고성능, 소형, 저가로 설계되었으며, 시제엔진을 제작하여 지상 성능 시험 및 고도 시험을 수행하였다. 본 논문에서는 소형, 저가, 고효율 터보제트 엔진을 구성하는 각 엔진 구성품의 특징, 구조, 구성품 및 엔진 시험 결과 등에 대하여 기술하였다. A 150 lbf-thrust class micro turbojet engine has been developed. The engine could be applied to power plant for small aviation vehicle such as UAV, decoy and anti-radar missile and was designed with concepts that has small size, low-cost and high performance. A prototype was manufactured and performed the ground static test and high altitude test. This paper outlines the features and layout of 150 lbf turbojet engine and also describes the design characteristics and test results of the engine and components.
정명균,오재민,팽기석,송재욱,Jeong, Myeong-Gyun,O, Jae-Min,Paeng, Gi-Seok,Song, Jae-Uk 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.3
In order to design and analyze the performance of an axial-flow pump it is necessary to know the flow deviation, deflection angle and pressure loss coefficient as a function of the angle of incidence for the hydrofoil section in use. Because such functions are unique to the particular section, however, general correlation formulae are not available for the multitude of hydrofoil profiles, and such functions must be generated by either experiment or numerical simulation for the given or selected hydrofoil section. The purpose of present study is to generate design correlations for hydrofoils with double circular arc (DCA) camber by numerical analysis using a commercial code, FLUENT. The cascade configuration is determined by a combination of the inlet blade angle, blade thickness, camber angle, and cascade solidity, and a total of 90 cascade configurations are analyzed in this study. The inlet Reynolds number based on the chord and the inlet absolute velocity is fixed at 5${\times}$10$\^$5/. Design correlations are formulated, based on the data at the incidence angle of minimum total pressure loss. The correlations obtained in this way show good agreement with the experiment data collected at NASA with DCA hydrofoils.
UAV 추진기관의 현황 및 차세대 UAV 추진기관의 개발 전망
이동훈(Donghun Lee),팽기석(Kisuk Paeng),김유일(Yuil Kim),박부민(Poomin Par),최성만(Seongman Choi),허환일(Hwanil Huh) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
현재 운용중인 UAV(Unmanned Aerial Vehicle) 추진기관의 현황 및 추진기관 종류에 따른 장, 단점을 분석하였으며, 차세대 UAV 추진기관의 개발 전망 및 UAV 추진기관에 적용될 가스터빈 엔진의 특성 및 요구조건을 제시하였다. The characteristics and present state of UAV engine which is operating currently were studied and advantages/disadvantages of UAV engines were also analyzed. Forecast of next generation UAV engine development trend was presented and the performance demand of gas turbine engine for UAV were suggested.
최재호(Jae Ho Choi),한착희(Chak Heui Han),팽기석(Ki Seok Paeng),전승배(Seung Bae Chen),김용련(Yong Ryun Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This paper presents an aerodynamic design, flow analysis and performance test of a pressure ratio 4:1 centrifugal compressor for gas turbine engine. The compressor is made up of a centrifugal impeller, a two-stage diffuser consisted of radial and axial types. The impeller has a 45 degree backswept angle and the design running tip clearance is 5% of impeller exit height. Three-dimensional numerical analysis is performed to analyze the flows in the impeller, diffuser and deswirler considering the impeller tip clearance. Test module and rig facilities for the compressor stage performance test are designed and fabricated. The overall compressor stage performances as well as the static pressure fields on the impeller and diffuser are measured. Two diffusers of wedge and airfoil types are tested with an impeller. The calculation and test results show that flow fields downstream the deswirler at the design and off-design points are highly nonuniform and the airfoil diffuser has the better aerodynamic characteristics than those of wedge diffuser.