Browse > Article
http://dx.doi.org/10.15435/JILASSKR.2021.26.1.9

Study on Atomization Characteristics of Shear Coaxial Injectors  

Ahn, Jonghyeon (충북대학교 기계공학부)
Lee, Keunseok (충북대학교 기계공학부)
Ahn, Kyubok (충북대학교 기계공학부)
Publication Information
Journal of ILASS-Korea / v.26, no.1, 2021 , pp. 9-17 More about this Journal
Abstract
Six shear coaxial injectors with different recess length and taper angle were manufactured. Cold-flow tests on the injectors were performed at room temperature and pressure using water and air as simulants. By changing the water mass flow rate and air mass flow rate, spray images were taken under single-injection and bi-injection. Breakup length and spray angle were analyzed from instantaneous and averaged spray images using image processing techniques. For all the injectors, the breakup length generally decreased as the momentum flux ratio increased at the same gas mass flow rate. The injectors with 7.5° taper angle usually had the longest breakup length and the smallest spray angle. When the taper angle was 15° or more, it hardly affected breakup length and spray angle. The recess length did not influence breakup length but its effect on spray angle depended on the taper angle.
Keywords
Atomization characteristics; Breakup length; Cold-flow test; Shear coaxial injector; Spray angle;
Citations & Related Records
연도 인용수 순위
  • Reference
1 A. Fusetti, M. De Rosa, M. Oschwald, and O. J. Hadin, "Influence of LOX injector wall thickness on atomization and combustion of LOX/CH4 sprays", 10th International Conference on Liquid Atomization and Spray Systems, 2006.
2 R. D. Woodward, S. Pal, S. Farhangi, G. E. Jensen, and R. J. Santoro, "LOX/GH2 Shear coaxial injector atomization studies: effect of recess and non-concentricity", 45th AIAA Aerospace Sciences Meeting and Exhibit, 2007.
3 J. Ahn, K. Lee, and K. Ahn, "Effect of geometrical parameters on discharge coefficients of a shear coaxial injector", Journal of ILASS-Korea, Vol. 25, No. 3, 2020, pp. 95-102.   DOI
4 L. R. Reneau, J. P. Johnston, and S. J. Kline, "Performance and design of straight, two-dimensional diffusers", Journal of Basic Engineering, Vol. 89, No. 1, 1967, pp. 141-150.   DOI
5 N. Otsu, "A threshold selection method from gray-level histograms", IEEE Transactions on Systems, Man, and Cybernetics, Vol. 9, No. 1, 1979, pp. 62-66.   DOI
6 K. H. Kim and D. S. Ju, "Development of 'CHASE-10' liquid rocket engine having 10tf thrust using LOX & LNG (methane)", 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006.
7 D. Kim, I. Lee, J. Lim, J. Koo, and Y. Park, "Performance and ignition characteristics of a coaxial swirl injector using LOX-GCH4 propellant", 35th KSPE Fall Conference, 2010.
8 M. C. Kim, Y. J. Kim, and J. S. Kim, "Configuration design, hot-firing test and performance evaluation of 200 N-class GCH4/LOX small rocket engine (Part II: Steady state-mode ground hot-firing test)", Journal of the Korean Society of Propulsion Engineers, Vol. 24, No. 1, 2020, pp. 9-16.   DOI
9 J. S. Jeon, J. H. Min, J. H. Jang, Y. S. Ko and S. J. Kim, "Design and experimental verification of uni-injector using gas methane and LOX as propellants", Transactions of the Korean Society of Mechanical Engineers - B, Vol. 37, No. 3, 2013, pp. 275-283.   DOI
10 Y. J. Kim, M. C. Kim, and J. S. Kim, "Configuration design, hot-firing test and performance evaluation of 200 N-class GCH4/LOX small rocket engine (Part I: A preliminary design and test apparatus)", Journal of the Korean Society of Propulsion Engineers, Vol. 24, No. 1, 2020, pp. 1-8.   DOI
11 M. A. Beisler, S. Pal, and M. D. Moser, "Shear coaxial injector atomization in a LOX/GH2 propellant rocket", 30th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 1994.
12 J. C. Oefelein, "Thermophysical characteristics of shearcoaxial LOX/H2 flames at supercritical pressure", Proceedings of the Combustion Institute, Vol. 30, No. 2, 2005, pp. 2929-2937.   DOI
13 M. Glogowski and M. M. Micci, "Shear coaxial injector spray characterization near the LOX post tip region", 31st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1995.
14 H. Tani, S. Teramoto, and K. Okamoto, "Effects of injector geometry on cryogenic shear coaxial jets at supercritical pressures", Journal of Propulsion and Power, Vol. 31, No. 3, 2015, pp. 883-888.   DOI
15 G. S. Gill and W. H. Nurick, "Liquid rocket engine injectors", NASA SP-8089, 1976.