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정하동,안종현,안규복 한국분무공학회 2023 한국액체미립화학회지 Vol.28 No.2
In this paper, the atomization characteristics of bi-swirl coaxial injectors for a 420 N-class bipropellant thruster were investigated. Three types of injectors, namely closed-type, open-type, and screw-type, were manufactured and designed to have the same spray angle and injection pressure drop. Water was used as a simulant, and cold-flow tests were conducted under ambient temperature and pressure conditions. Since the inner and outer injectors were designed to be the same type, only the inner fuel injectors that were easy to measure were used. Using a phase doppler particle analyzer, the velocity and diameter of atomized droplets were measured. Closed-type swirl injector exhibited droplet distributions with relatively high velocities and small SMD compared to the other two injectors. Open-type swirl injector formed droplets with reverse velocities in the center region and had a large recirculation zone. Screw-type swirl injector showed a sharp decrease in droplet velocity and size with radial distance from the liquid film breakup point. For the same design requirements, the closed-type swirl injector has superior atomization performance.
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.