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충돌분류에 의한 액적의 크기 및 속도특성에 관한 실험적 연구
한재섭 ( Jae Seob Han ),김선진 ( Seon Jin Kim ) 한국분무공학회 1999 한국액체미립화학회지 Vol.4 No.4
The breakup characteristics of liquid sheet formed by the liquid rocket injector has a close relation with the combustion efficiency. In this paper, basic characteristics of droplet size and velocity distribution were measured with PDPA for the Like Doublet Impinging Injector. Test variables were the angle of impact, the diameter of orifice and jet velocity. Water was used as test fluid. As a result, for impingement angle less than 90 degree, following correlations were obtained between drop size and design parameters : D32(㎛)=295.0×V(-0.09)×(2θ)(-0.1)d×(0.072). For impingement angle greater than 100 degree, drop sizes were increased but eventually converged to a certain limiting value.
한재섭(Jae-Seob Han),김영완(Young-Wan Kim),백종균(Jong-Gyun Baek),김종필(Jong-Pil Kim) 한국항공우주학회 2019 韓國航空宇宙學會誌 Vol.47 No.2
본 논문에서는 항공용 소형 레이다나 유도 무기 탐색기 등에 적용이 가능한 Ka대역 평면형 능동 위상배열 안테나장치를 설계한 내용을 설명하였다. 본 안테나장치는 1000개 급의 복사소자 면배열로 구성하고, 직경 200mm 이내의 크기로 설계하였다. 빔 조향 범위는 ±55° 이상 가능하도록 빔패턴 분석을 통하여 복사 소자 간격을 정의하고 안테나 성능 분석을 수행하였다. RF 구성품 설계와 버짓 검증을 통해 안테나장치의 송신 EIRP는 94.22 dBm, 수신 G/T는 1.68 dB/k 성능으로 요구 규격을 만족할 수 있음을 확인하였다. 송신 EIRP 규격을 만족하기 위해 TRM의 송신 출력은 1.3W 급으로 설계하였고, 수신 G/T 규격을 만족하기 위해 TRM의 수신 잡음 지수를 5dB 이하가 되도록 설계하였다. In this paper, we described the design of Ka-band planar active phased array antenna which is applicable for small RADAR for airborne and seeker of guided missile. The antenna consists of about 1000 array radiating elements and is designed to be within 200mm diameter. We optimized the spacing of radiating elements to allow beem steering above ± 55 degrees of Field of view, and analyzed the performance of antenna. We confirmed that the Effective Isotropic Radiated Power (EIRP) of the antenna can be 94.22 dBm and receive G/T can be 1.68 dB/k through the designs of RF components and the verification of RF budget. The TX output of TR Module is designed to be over 1.3W for EIRP, and Receive noise figure of TR Module is designed to be less than 5dB for G/T.
한재섭(Jae Seob Han),김선진(Seon Jin Kim),김유(Yoo Kim),민세홍(Se Hong Min) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.1
In order to develop the rocket engine which is applied to space transport vehicle, it is necessary that fundamental data for engine design and technique of combustion experimentation. Being based on accumulated experiences for the last many years, we study general procedures and methods for the development of ground static test system. Basic spray characteristics of Injector was measured with instantaneous image of the spray cone, Patternater, and PDPA. Combustion efficiency was measured with actual combustion experimentation Resultly, we gained many fundamental data for rocket engine design and experimental technique for combustion experimentation. we expect that this fundamental data are used in the development of large rocket engine and ground static test system.
충돌분류에 의한 액적의 분포특성 및 연소성능예측에 관한 연구
한재섭(Jae Seob Han),김선진(Seon Jin Kim),김유(Yoo Kim) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.2
The distribution characteristics formed by the liquid rocket injector has a close relation with the combustion performance and instability. In this paper, basic characteristics of distribution was measured with patternator for the Like Doublet Impinging Injector. and, for the prediction of combustion performance, mixing efficiency and efficiency of characteristic velocity are calculated by using the experimental data. Experimental variables were the angle of impact, the diameter of orifice and jet velocity. Water was used as Experimental fluid. Experimental results show that the mass fraction and standard deviation are decreased with increasing impinging angle, jet velocity, and orifice diameter. Maximum efficiency for the characteristic velocity occurs at momentum ratio (ρ_od²_oV²_o/ρ_fd²_fV²_f) 1.0, on the other hand maximum mixing efficiency occurs at the value of 1.5.
점도변화에 따른 탄화수소계 연료의 분무특성에 관한 연구
이용일(Yong Il Lee),한재섭(Jae Seob Han) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.3
An experimental study was carried out to understand the spray characteristics of three kinds(kerosene, heating oil & diesel) of hydrocarbon-fuels. Fuel temperature and injection pressure were main variables in the experiment. Fuel Temperature was changed to obtain various levels of fuel viscosity. Spray angle and spray length were measured by using LVS(Laser Vapor Screen) photographs. 1D PDPA system was used to measure droplet size & droplet velocity. In room temperature, spray characteristics of three kinds of fuels were good, especially in case the fuel injection pressure was more than 6 Kgf/㎠. It was also found that spray characteristics were poor in case fuel kinematic viscosity was more than 5cSt.