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논문 기본 정보

자료유형
학술대회자료
저자정보
Mohamed Y. Hashim (Jeonbuk National University) Jonggeun Bae (Jeonbuk National University) Foad Vashahi (Jeonbuk National University) Jeekeun Lee
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2020년 학술대회
발행연도
2020.12
수록면
652 - 657 (6page)

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The current investigation is acquired by using Computation Fluid Dynamic (CFD) to investigate the main characteristic of a turbulent swirling flow in a gas turbine combustor under contraction ratio (CR) variations. These calculations are performed by using STAR-CCM+ commercial software from Siemens and under unsteady-state condition. The realizable k-ε turbulence model is used as it has been the most foretelling scheme for modeling swirling flow inside gas turbine combustors. Two values of CR are used in the study (0 and 50 %, respectively). The swirling flow has been employed to the combustor with methane (CH₄) as the primary fuel. CH4 is injected at constant frequency (0 Hz) with constant air mass flow rate. The results are indicated that when CR = 0 %, the length of central toroidal recirculation zone (CTRZ) extends to nearly 40% of the combustor length. In addition, the core of corner recirculation zone (CRZ) is 0.5 mm. On the other hand, when CR = 50 %, there is a reduction in formation of CTRZ. Furthermore, its length shrinkages to be 30% of the combustor length. However, the core of CRZ‘s diameter has increased twice. The pressure gradient changed to the axial direction, which provides the vortex breakdown bubble and reverses the flow behavior. The stagnation point relocated due to the change in the state of vortex breakdown and the structure of the swir ling flow changed.

목차

Abstract
1. Introduction
2. Methodology
3. Results and discussion
4. Conclusion
References

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