[논문]기체주입식 분사기의 이상유동 변화와 분무특성에 관한 연구

이강영; 정하동; 강철웅; 안규복

doi:10.15435/jilasskr.2022.27.3.144

[국내논문] 기체주입식 분사기의 이상유동 변화와 분무특성에 관한 연구
A Study on the Two-Phase Flow Transition and Atomization Characteristics in Effervescent Injectors 원문보기

한국분무공학회지 = Journal of ilass-korea, v.27 no.3, 2022년, pp.144 - 154

이강영 (충북대학교 기계공학부) , 정하동 (충북대학교 기계공학부) , 강철웅 (충북대학교 기계공학부) , 안규복 (충북대학교 기계공학부)

Abstract ▼ AI-Helper

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.

Keyword

표/그림 (12)

그림 Fig. 1 Transition of two-phase flow
그림 Fig. 2 Schematic of each aerator design and injector assembly
그림 Fig. 3 Schematic of experimental setup
표 Table 1 Experimental condition
그림 Fig. 4 Transition of injector internal flow according to TR and GLR
그림 Fig. 5 Injector internal two-phase flow map for each aerator and injector
그림 Fig. 6 Transition of two-phase flow spray pattern according to TR and GLR
그림 Fig. 7 Spray map of two-phase flow for each aerator and injector
그림 Fig. 8 Breakup length measurement through image binarization
그림 Fig. 9 Average breakup length normalized by d_inj
그림 Fig. 10 Injection pressure drop for d_inj = 1.0 mm
그림 Fig. 11 Discharge coefficient for d_inj = 1.0 mm

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