[논문]전단동축형 분사기들의 미립화 특성에 대한 연구

안종현; 이근석; 안규복

doi:10.15435/jilasskr.2021.26.1.9

전단동축형 분사기들의 미립화 특성에 대한 연구
Study on Atomization Characteristics of Shear Coaxial Injectors 원문보기

한국분무공학회지 = Journal of ilass-korea, v.26 no.1, 2021년, pp.9 - 17

안종현 (충북대학교 기계공학부) , 이근석 (충북대학교 기계공학부) , 안규복 (충북대학교 기계공학부)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (12)

그림 Fig. 1 Schematic diagram of the experimental setup
그림 Fig. 2 Cross-section of the injector
그림 Fig. 3 Nominal and Experimental conditions of cold-flow tests
표 Table 1 Geometrical parameters of the shear coaxial injectors
그림 Fig. 4 Instantaneous spray images of Inj #1 according to the mass flow rates of water and air
그림 Fig. 5 Instantaneous spray images under single-injection and bi-injection
그림 Fig. 6 Determination of breakup lengths by the image processing technique
그림 Fig. 7 Breakup length results for each injector
그림 Fig. 8 Breakup lengths as a function of the momentum flux ratio
그림 Fig. 9 Definition of spray angles by the image processing technique
그림 Fig. 10 Spray angle results for each injector
그림 Fig. 11 Spray angles as a function of the momentum flux ratio

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