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큰 후향 계단이 있는 이중 모드 램젯 엔진 모델의 램젯 모드 연소 시험
양인영(Inyoung Yang),이경재(Kyung-jae Lee),이양지(Yang-ji Lee),김춘택(Chun-taek Kim) 한국추진공학회 2016 한국추진공학회지 Vol.20 No.6
Ramjet mode combustion test was performed for a dual-mode ramjet engine model. The engine model consists of an air intake, a combustor and a nozzle. The combustor in the model has a large backward-facing step, designed to be used as a part of a rocket-based combined cycle engine. The test was performed at the flight speed of Mach 5 and the altitude of 24 km. Strong combustion was established only when the fuel was injected from both of the bottom-side and cowl-side wall. When the total fuel stoichiometric ratio was 1.0, distributed as 0.5 on the cowl side and 0.5 on the bottom side, the flow became subsonic at some portion in the combustor by thermal choking, i.e., ramjet mode was established for this condition.
위치에너지를 축적하는 태양동력 장기체공 무인기의 설계 인자 분석
양인영(Inyoung Yang),이보화(Bo-Hwa Lee),장병희(Byung-Hee Chang) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.10
상승 비행에 의해 위치에너지를 축적하는 태양동력 장기체공 무인기에 대하여 설계 인자 분석을 수행하였다. 위치에너지 축적을 위한 비행과 관련된 인자인 최저 및 최고 수평 비행 고도, 활강 및 상승 각도, 설계점 속도 및 고도, 활강 및 상승 시작 시각을 분석 대상으로 하였다. 태양동력 무인기 구성품의 중량 모델을 이용하여 항공기 크기 및 중량을 결정하고 비행 중 생산 및 소모하는 에너지를 계산함으로써 임무 수행에 필요한 배터리 용량을 결정하였다. 각 설계 인자값과 무인기 중량의 관계를 연구하였다. 최고 수평 비행 고도, 활강 및 상승 각도, 설계점 속도 및 고도, 활강 및 상승 시작 시각에는 설계가 가능하도록 하는 범위가 존재하며 이 범위 내에서 총 중량을 최소화하는 최적값이 존재하였다. Design parameter analysis is performed for a solar-powered UAV, storing potential energy by climb flight. Parameters related to the flight for saving potential energy, i.e. minimum & maximum altitudes for level flight, gliding & climbing angle, design point speed & altitude, gliding & climbing start time are investigated as design parameters. Weight and size of the UAV are determined using a weight model for the components of the solar-powered UAVs. Produced energy and consumed energy are calculated using these weight and size, yielding the required weight of the battery for a given mission. Relationship between the total weight of the UAV and each parameter is investigated. For the parameters listed above, there exist their ranges only where the design is possible. And there exist optimal values of these parameters minimizing the total weight.
양인영(Inyoung Yang),이경재(Kyung-Jae Lee),이양지(Yang-Ji Lee),이상훈(Sanghoon Lee),김형모(Hyungmo Kim),박부민(Poomin Park) 한국추진공학회 2018 한국추진공학회지 Vol.22 No.3
A combustion test for a supersonic combustor was conducted using a direct-connected type supersonic combustor test facility. The facility was verified for the capability of simulating required flow conditions. The test condition was maintained at Mach 2.0, 915 ℃ and 496 kPa for 15 s. Using gaseous hydrogen as the fuel, the combustor model was also tested for its ignition and flame holding capability at the fuel equivalence ratio of 0.12. Combustion efficiency was 71%, and the supersonic flow regime was obtained at this test condition.
양인영(Inyoung Yang),이보화(Bo-Hwa Lee) 한국추진공학회 2010 한국추진공학회지 Vol.14 No.4
Measurement uncertainty assessment was performed for altitude performance test for a turboshaft engine. Mathematical models of measurement were suggested for major performance parameters such as shaft horse power, fuel flow, specific fuel consumption, and airflow. The procedure was compared with the test of turbojet or turbofan engines. Uncertainty involved with the test condition measurement was assessed. Influence of the test condition measurement uncertainty on the corrected performance data was discussed. Uncertainty assessment result was provided for a example test case using a real altitude test facility. For major performance parameters, measurement uncertainties were assessed as 0.65~1.09% including the test condition measurement uncertainty, 0.36~0.94% not including it.
양인영(Inyoung Yang),이경재(Kyung-jae Lee),이양지(Yang-ji Lee),김형모(Hyung-Mo Kim) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
스크램젯 엔진용 초음속 연소기 연구를 위한 직결형, 연속식 연소 시험 설비를 개발하였다. 비행체 속도 마하 5, 연소기 입구 유속 마하 2를 가정하고, 시험 대상 연소기의 유로 단면은 높이 32 mm, 폭 70 mm로 가정하여 설비 요구 조건을 결정하였다. 이에 따라 설비는 유동 전압력 548 kPaA, 전온도 1,320 K, 유량 0.776 kg/s로 설계하였다. 설비는 터보형 압축기, 전기 가열기 및 연소식 가열기와 그 하류에 유동 가속을 위해 장착한 마하 2의 2차원 노즐로 구성하였다. 노즐 상류에서 산소를 추가 공급하여 연소식 공기 가열에 의한 산소 감소를 보상하도록 하였다. 배기는 별도의 감압은 하지 않았다. 저압, 저유량에서의 시운전을 수행하였으며, 설계점 운전은 향후 계획 중에 있다. A direct-connected, continuous type combustion test facility was developed to test a supersonic combustor model used in scramjet engines. The facility requirements were determined by assuming the flight speed of Mach 5, yielding the combustor inlet flow speed of Mach 2. Also the cross-section of the supersonic combustor under test was assumed as 32 mm X 70 mm. As a result, the facility was designed to have the flow total pressure of 548 kPaA, total temperature of 1,320 K, and flow rate of 0.776 kg/s. The facility consists of a turbo type air compressor, electric air heater, vitiation air heater and a two dimensional facility nozzle to accelerate the flow to Mach 2. Also, an oxygen supply system was added to compensate the vitiation. The exhaust de-pressurization system is not added. Designed pressure, temperature, and flow rate were verified through the test operation of the facility.
큰 후향 계단이 있는 이중 모드 램젯 엔진의 설계 연구
양인영(Inyoung Yang),이양지(Yang-Ji Lee),이경재 (Kyung-Jae Lee) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.6
Scaled model of a dual-mode ramjet engine with large backward-facing step, as a component of the rocket-based combined cycle engine, was designed. Design parameters were derived for this engine with the consideration of application for the rocket-based combined cycle engine. Design methodology was established for these design parameters. The design was partially verified through numerical study. Flow characteristics of the dual-mode ramjet engine with large backward-facing step was investigated experimentally. The design methodology for relevant design parameters established in this study was verified as feasible.