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논문 기본 정보

자료유형
학술저널
저자정보
Jinhyun Bae (Seoul National University) Jisu Yoon (Korea Institute of Machinery & Materials) Seongpil Joo (Seoul National University) Jeoungjin Kim (Seoul National University) Chanyeong Jeong (Samsung Electronics) Chae Hoon Sohn (Sejong University) Igor N. Borovik (Moscow Aviation Institute) Youngbin Yoon (Seoul National University)
저널정보
한국항공우주학회 International Journal of Aeronautical and Space Sciences International Journal of Aeronautical and Space Sciences Volume.18 Number.4
발행연도
2017.12
수록면
797 - 806 (10page)
DOI
10.5139/IJASS.2017.18.4.797

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초록· 키워드

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In this study, the reflection coefficient (RC) and the flame transfer function (FTF) were measured by applying acoustic excitation to a duct-type model combustor and were used to predict the frequency of the combustion instability (CI). The RC is a value that varies with the excitation frequency and the geometry of the combustor as well as other factors. Therefore, in this study, an experimentally measured RC was used to improve the accuracy of prediction in the cases of 25% and 75% hydrogen in a mixture of hydrogen and methane as a fuel. When the measured RCs were used, an unstable condition was correctly predicted, which had not been predicted when the RCs had been assumed to be a certain value. The reason why the CI occurred at a specific frequency was also examined by comparing the peak of the FTF with the resonance frequency, which was calculated using Helmholtz’s resonator analysis and a resonance frequency equation. As the CI occurred owing to the interaction between the perturbation in the rate of heat release and that in the pressure, the CI was frequent when the peak of the FTF was close to the resonance frequency such that constructive interference could occur.

목차

Abstract
1. Introduction
2. Experimental Apparatus and Method
3. Results and Discussion
4. Conclusion
References

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