[논문]액체-기체 와류동축형 분사기의 자기-맥동에 대한 기체 밀도의 영향

안종현; 강철웅; 안규복

doi:10.15435/jilasskr.2022.27.3.134

액체-기체 와류동축형 분사기의 자기-맥동에 대한 기체 밀도의 영향
Effect of Gas Density on Self-Pulsation in Liquid-Gas Swirl Coaxial Injector 원문보기

한국분무공학회지 = Journal of ilass-korea, v.27 no.3, 2022년, pp.134 - 143

안종현 (충북대학교 기계공학부) , 강철웅 (충북대학교 기계공학부) , 안규복 (충북대학교 기계공학부)

Abstract ▼ AI-Helper

When a recess is applied to a swirl coaxial injector that uses liquid and gas propellants, a self-pulsation phenomenon in which the spray oscillates at regular intervals may occur. The phenomenon is caused by the interaction between the liquid and gas propellants inside the injector recess region. The propellants' kinetic energies are expected to affect significantly the spray oscillation. Therefore, cold-flow tests using helium as a gas-simulating propellant were conducted and compared with the results of the previous study using air. Dynamic pressure was measured in the injector manifold and frequency characteristics were investigated through the fast Fourier transform analysis. In the experimental environment, the helium density was about seven times lower than the air density. Accordingly, the intensity of pressure fluctuations was confirmed to be greater when air was used. At the same kinetic energy condition, the perturbation frequency was almost identical in the low flow rate conditions. However, as the flow rate increased, the self-pulsation frequency was higher when helium was used.

주제어

표/그림 (14)

그림 Fig. 1 Cross-section of swirl coaxial injector
그림 Fig. 2 Schematic diagram of experimental set-up
표 Table 1 Geometrical parameters of swirl coaxial injectors
그림 Fig. 3 Position of measuring sensors installed on the injector manifold
표 Table 2 Physical properties of simulation propellants used in experiments
표 Table 3 Experimental conditions of previous and present cold-flow tests
그림 Fig. 4 Experimental conditions expressed by propellant mass flow rates
그림 Fig. 5 Comparison of spray patterns according to the occurrence of self-pulsation
그림 Fig. 6 Flow conditions for self-pulsation in experiments using: (a) helium and (b) air
그림 Fig. 7 Intensity of pressure perturbations measured at the oxidizer manifold using: (a) helium and (b) air
그림 Fig. 8 Intensity of pressure perturbations measured at the fuel manifold using: (a) helium and (b) air
그림 Fig. 9 Dominant frequency mapping results using: (a) helium and (b) air
그림 Fig. 10 Dominant frequency according to propellant flow rates under: (a) fixed gas conditions and (b) fixed liquid condition
그림 Fig. 11 Comparison of measured and calculated dominant frequencies for different gases using: (a) Eqs. (6, 7) and (b) Eq. (6)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기

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