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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
664 - 669 (6page)

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The present work makes a numerical progress towards improving the theoretical understanding of the interaction between the dynamics of swirling flow fields and fuel injection frequencies. These forced frequencies (ff) are (0, 50, 100, 250, 500) Hz. In this study, a pulsed injection of methane (CH4) with swirling inlet flow are investigated numerically by applying Unsteady Reynolds Averaged Navier-Stokes (URANS) approach using STAR-CCM+ commercial software from Siemens. Air flows through a swirler into the combustor model at mass flowrate of 11.9 g/s. Where, methane (CH₄) is injected to the model by using an applied field function. Results indicate that when ff = 0 Hz, the swirling motion becomes weak due to the weak momentum ratio (MR<1) and this leads to form a wake recirculation zone (WRZ) behind the central recirculation zone (CRZ). In addition, the spreading of the flow at the beginning and while moving downstream along the axial direction of the combustor is mainly because of the centrifugal force imparted on the flow. On the other hand, strong peaks for mean axial velocity are shown in the middle for all ff. This peak is a strong indictor to form inner shear layers that is in turn stimulates the mixing region between the central toroidal recirculation zone (CTRZ) and the positive streamwise velocity flow. Furthermore, the stagnation point shift up stream to be at the centre axis of the combustor. This indicates strong rate of high strain rate region will be pushed upstream with increasing the frequency.

목차

Abstract
1. Introduction
2. Computational setup
3. Results and discussion
Conclusion
References

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