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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국항공우주학회 International Journal of Aeronautical and Space Sciences International Journal of Aeronautical and Space Sciences Volume.13 Number.3
- 발행연도
- 2012.9
- 수록면
- 386 - 397 (12page)
이용수
초록· 키워드
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The stability and structure of bluff-body stabilized hydrogen flames were investigated numerically and experimentally. The velocity of coflowing air was varied from subsonic velocity to a supersonic velocity of Mach 1.8. OH PLIF images and Schlieren images were used for analysis. Flame regimes were used to classify the characteristic flame modes according to the variation of the fuel-air velocity ratio, into jet-like flame, central-jet-dominated flame, and recirculation zone flame. Stability curves were drawn to find the blowout regimes and to show the improvement in flame stability with increasing lip thickness of the fuel tube, which acts as a bluff-body. These curves collapse to a single line when the blowout curves are normalized by the size of the bluff-body. The variation of flame length with the increase in air flow rate was also investigated. In the subsonic coflow condition, the flame length decreased significantly, but in the supersonic coflow condition, the flame length increased slowly and finally reached a near-constant value. This phenomenon is attributed to the air-entrainment of subsonic flow and the compressibility effect of supersonic flow. The closed-tip recirculation zone flames in supersonic coflow had a reacting core in the partially premixed zone, where the fuel jet lost its momentum due to the high-pressure zone and followed the recirculation zone; this behavior resulted in the long characteristic time for the fuel-air mixing.
목차
Abstract
Nomenclature
1. Introduction
2. Experiments and Analysis Methods
3. Results And Discussions
4. Conclusions
Acknowledgement
References
참고문헌 (27)
참고문헌 신청
1. [학술지(정기간행물)] - Esquiva-Dano, I. / 2001 / Influence of a bluff-body’s shape on the stabilization regime of non-premixed flames / Combustion and Flame 127 : 2167 ~ 2180
2. [학술지(정기간행물)] - Kundu, K. M. / 1980 / On flame stabilization by bluff-bodies / Journal of Engineering for Power 102 : 209 ~ 214
3. [학술지(정기간행물)] - Roquemore, W. M. / 1983 / Dynamic behavior of a bluff-body diffusion flame / AIAA Journal 21 : 1410 ~ 1417
4. [학술대회논문] - Masri, A. R. / 1984 / Turbulent Diffusion Flames of Hydrocarbon Fuels Stabilized on a Bluff Body / Proceedings of the Combustion Institute 20 : 319 ~ 326
5. [학술지(정기간행물)] - Huang, R. F. / 1994 / Characteristic modes and thermal structure of nonpremixed circular-disc stabilized flame / Combustion Science and Technology 100 : 123 ~ 139
2. [학술지(정기간행물)] - Kundu, K. M. / 1980 / On flame stabilization by bluff-bodies / Journal of Engineering for Power 102 : 209 ~ 214
3. [학술지(정기간행물)] - Roquemore, W. M. / 1983 / Dynamic behavior of a bluff-body diffusion flame / AIAA Journal 21 : 1410 ~ 1417
4. [학술대회논문] - Masri, A. R. / 1984 / Turbulent Diffusion Flames of Hydrocarbon Fuels Stabilized on a Bluff Body / Proceedings of the Combustion Institute 20 : 319 ~ 326
5. [학술지(정기간행물)] - Huang, R. F. / 1994 / Characteristic modes and thermal structure of nonpremixed circular-disc stabilized flame / Combustion Science and Technology 100 : 123 ~ 139
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UCI(KEPA) : I410-ECN-0101-2014-558-001182752