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기체 중심 스월 동축형 분사기의 불안정성 분무 현상과 연소기 설계
박구정(Gujeong Park),배진현(Jinhyun Bae),이수지(Suji Lee),이정호(Jungho Lee),윤영빈(Youngbin Yoon) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
한국형발사체 개발 이후 우리나라도 더 높은 효율을 가진 액체 로켓 엔진 개발이 필요하다. 이에 따라서 가스 발생기 엔진보다 높은 효율을 가진 다단 연소 사이클 엔진의 분사기에 대한 연구가 필요하고 주로 사용되는 기체 중심 스월 동축형 분사기에 대한 분무 불안정성 연구를 진행하였다. 또한 이 분사기를 이용하여 추후 연소불안정성에 대한 연구를 위하여 모형 연소기 설계 및 연구 계획을 설명하였다. After the development of KSLV-Ⅱ, We need to higher efficiency engines than KSLV-Ⅱ. The study for staged combustion cycle engine which has higher efficiency than the gas generator cycle engine is required. We conducted the research about gas-centered swirl coaxial injector which usually used in the staged combustion cycle engine. Also, using the gas centered swirl coaxial injector, design and research plan of a model combustor were explained for experiment about the combustion instability.
토모그래피 기법을 이용한 스월 인젝터의 분무 분포 계측
박구정(Gujeong Park),조성호(Seongho Cho),정재묵(Jaemook Chung),김태성(Taesung Kim),윤영빈(Youngbin Yoon) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
고압의 주위 압력 영역에서 토모그래피 기법을 이용하여 분무의 단면을 구성하였다. 구성된 분무 단면은 Indirect Photography method를 이용한 이미지와 함께 비교되어 분무 단면의 크기를 확인하였고 토모그래피에 의해 재구성된 단면의 경계를 설정할 수 있었다. 이를 통해 고압의 주위 압력 영역에서도 토모그래피를 적용하여 분무를 구성할 수 있다는 것을 확인하였다. This study constructed the spray distribution by the Tomography method at high pressure condition. The constructed spray distribution was compared with the images by Indirect Photography method so that the spray size was confirmed and took the boundary of the distribution. It was confirmed that the Tomography applies to construct the distribution at high pressure.
운동량 비 변화에 따른 기체 중심 스월 동축형 분사기의 분무 특성 변화
박구정(Gujeong Park),이정호(Jungho Lee),이인규(Inkyu Lee),윤영빈(Youngbin Yoon) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5
기체 중심 스월 동축형 분사기에서 기체-액체 운동량 비에 따른 분무 특성을 파악하였다. 운동량비가 증가하면 기체의 운동량이 액체 운동량보다 커지게 되고 기체의 축 방향 운동량이 분무에 큰 영향을 미친다. 이에 따라 운동량 비가 커지면 분무각은 감소한다. 또한 리세스 길이가 길어지게 되면 기체-액체의 혼합영역이 증가하게 되어 기체의 영향이 증가하게 되고 분무각은 감소한다. The objective of this work was to investigate the spray characteristics of gas centered swirl coaxial injectors according to the gas-liquid momentum flux ratio which is the key parameter of coaxial injectors. The results showed that the spray angle decreased as the momentum flux ratio increased. At the low liquid differential pressure and high gas velocity, the variation of spray angle increased larger than the condition at the high liquid differential pressure and low gas velocity. As the recess length increased, that is the mixing area of gas and liquid, the spray angle decreased because the effect of gas became larger.
기체 중심 스월 동축형 분사기에서 갭 두께 변화에 따른 분무 특성 연구
박구정(Gujeong Park),이정호(Jungho Lee),윤영빈(Youngbin Yoon) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
기체 중심 스월 동축형 분사기에서 갭 두께의 변화에 따른 분무특성을 평균 액막 두께와 분무각을 통하여 파악하였다. 기체-액체 운동량 플럭스 비가 증가함에 따라 액막 두께와 분무각은 감소하는 경향을 보였다. 갭 두께가 증가했을 때 갭 공간에 액막이 가득히 차지 않는 경우가 발생하여 일정 두께 이상의 액막이 형성되지 않는 것을 확인할 수 있었다. The spray characteristics on gap thickness were investigated by the average film thickness and spray angle in the gas-centered swirl coaxial injectors. The film thickness and spray angle had generally decreasing tendency as the momentum flux ratio increased. although the gap thickness was large, the gap was not filled with water so that the film was not formed over certain thickness.
Dense Spray Patternation using Optical Tomography
Cho, Seongho,Park, Gujeong,Yoon, Youngbin The Korean Society for Aeronautical and Space Scie 2013 International Journal of Aeronautical and Space Sc Vol.14 No.4
Optical tomography was used to measure the pattern of spray cross-section. The maximum-likelihood estimation (MLE) algorithm was used to reconstruct the spray cross-section from the measured transmission rate of the spray. A swirl-type injector was used to form an optically dense spray, and the test was carried out in a high-pressure chamber, to control the pressure condition of the test site. Before the experiment, the reliability of the MLE-based reconstruction algorithm was verified, by comparing it with a conventional filtered back projection reconstruction (FBP) method. The MLE algorithm showed superior reconstruction of the image. In the spray patternation experiment, the results of the optical tomography and optical line patternator, which uses Mie scattering signal information, were compared. While measuring the cross-section of optically dense spray, the intensity of the scattering signal had attenuated to an uncorrectable level, which led to incorrect spray pattern measurement by the optical line patternator. However, reliable results were obtained by optical tomography, under the same condition. Finally, the pattern of the optically dense spray was measured at various chamber pressures, of up to 3 MPa. As the chamber pressure increased, the hollow cone-shaped swirl spray shrank, and the attenuation coefficient value of the inner region increased.
Dense Spray Patternation using Optical Tomography
Seongho Cho,Gujeong Park,Youngbin Yoon 한국항공우주학회 2013 International Journal of Aeronautical and Space Sc Vol.14 No.4
Optical tomography was used to measure the pattern of spray cross-section. The maximum-likelihood estimation (MLE) algorithm was used to reconstruct the spray cross-section from the measured transmission rate of the spray. A swirl-type injector was used to form an optically dense spray, and the test was carried out in a high-pressure chamber, to control the pressure condition of the test site. Before the experiment, the reliability of the MLE-based reconstruction algorithm was verified, by comparing it with a conventional filtered back projection reconstruction (FBP) method. The MLE algorithm showed superior reconstruction of the image. In the spray patternation experiment, the results of the optical tomography and optical line patternator, which uses Mie scattering signal information, were compared. While measuring the cross-section of optically dense spray, the intensity of the scattering signal had attenuated to an uncorrectable level, which led to incorrect spray pattern measurement by the optical line patternator. However, reliable results were obtained by optical tomography, under the same condition. Finally, the pattern of the optically dense spray was measured at various chamber pressures, of up to 3 MPa. As the chamber pressure increased, the hollow cone-shaped swirl spray shrank, and the attenuation coefficient value of the inner region increased.
Lee, Ingyu,Yoon, Jungsoo,Park, Gujeong,Yoon, Youngbin The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.4
A throttleable rocket engine enables operational possibilities such as the docking of spacecraft, maneuvering in a certain orbit and landing on a planet's surface, altitude control, and entrance to atmosphere-less planets. Thus, throttling methods have long been researched. However, dual-manifold injectors, which represent one throttling method, have been investigated less than others. In this study, dual-manifold and single-manifold injectors were compared to determine the characteristics of dual-manifold injectors. Also, the effects of gas injection were investigated with various F/O ratios. To investigate the characteristics, mass flow rate, spray pattern, spray angle, and droplet size were measured. The spray angle and droplet size were captured by indirect photography. About 30 images were taken to assess the spray patterns and spray angle. Also, 700 images were analyzed to understand the droplet distribution and targeting area, moving to the right from the centerline with 1.11-cm intervals. The droplet size was obtained from an image processing procedure. From the results, the spray angle showed two transition regions, due to swirl momentum in the swirl chamber regardless of the F/O ratio. The droplet size showed similar trends in both dual-manifold and single-manifold injectors except in the low mass flow rate region. In the case of the dual- manifold injector, the spray cone was not fully developed in the low mass flow rate region due to low angular momentum in the swirl chamber.