http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
기체주입식 분사기의 이상유동 변화와 분무특성에 관한 연구
이강영,정하동,강철웅,안규복,Lee, Kangyeong,Jung, Hadong,Kang, Cheolwoong,Ahn, Kyubok 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.3
Gas injection is a technique applied to improve throttling in liquid rocket engines and atomization in effervescent injectors. When a gas is injected into a liquid, it creates a two-phase flow inside the injector. The changes (bubbly flow, slug flow, annular flow, etc.) in the two-phase flow affect the injector's spray characteristics. In this study, cold-flow tests were performed by using three injectors with different orifice diameters and four aerators with different gas injection hole diameters. The experiments were done by changing the thrust ratio (liquid mass flow rate ratio) and gas-liquid mass flow rate ratio. Two-phase flow transition, breakup length, and discharge coefficient according to the injector/aerator design and flow conditions were investigated in detail.
Phase Doppler Particle Analyzer를 이용한 기체주입식 와류형 분사기 연구
이강영 ( Kangyeong Lee ),정하동 ( Hadong Jung ),안규복 ( Kyubok Ahn ) 충북대학교 산업과학기술연구소 2023 산업과학기술연구 논문집 Vol.37 No.1
The effervescent injector has an advantage of having excellent atomization performance even at a low injection pressure-drop. It can also be used as one of several methods for variable throttling of rocket engines. This research was conducted to verify the atomization characteristics when the gas injection method was applied to a closed-type swirl injector. For the measurement of the atomization data, a PDPA(Phase Doppler Particle Analyzer) using an argon laser was used. It was confirmed that the diameter of the generated droplets decreased as the flow rate of the gas increased. In addition, as the flow rate of the gas increased, the velocity of the droplets increased in the recirculation area at the discharge orifice of the swirl injector, and it was confirmed that droplets with a high velocity appeared in the axial direction of the injector.
강철웅(Cheolwoong Kang),이신우(Shinwoo Lee),한선우(Sunwoo Han),이강영(Kangyeong Lee),정하동(Hadong Jung),최동우(Dongwoo Choi),안규복(Kyubok Ahn) 한국추진공학회 2023 한국추진공학회지 Vol.27 No.1
Results of dry-run tests, cold-flow tests, and hot-firing tests performed to throttle a methane engine uni-element thrust chamber are covered in the paper. After installing flow control valves on the oxidizer and fuel supply lines of the methane engine combustion test facility, a number of dry-run tests were repeated so that the valves could reach set strokes quickly and stably. Then, cold-flow tests using liquid nitrogen and gaseous nitrogen were conducted to confirm the stable supply of the simulated propellants according to the valve control. Finally, using liquid oxygen and gaseous methane, hot-firing tests for fixed and continuous thrust control of 50% to 10% of the nominal thrust were successfully performed.