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Investigation on the Effects of Atwood Number on the Combustion Performance of Hydrogen-Oxygen Supersonic Mixing Layer

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Proceedings of the International Conference on Aerospace System Science and Engineering 2020 (ICASSE 2020)

Part of the book series: Lecture Notes in Electrical Engineering ((LNEE,volume 680))

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Abstract

Combustion enhancement strategies are needed to improve the combustion efficiency of the supersonic shear layer. A 2D hydrogen-air supersonic shear layer with central jet filled of hydrogen and inert gas mixture under different Atwood (At) numbers is simulated, based on Navier-Stokes equations. The main purpose is to study whether optimal combustion enhancement can be obtained by changing fluid properties (At number). The Euler method cannot effectively identify the hidden flow field structure. Thus, the Lagrangian coherent structure method (LCS) is adopted to visualize the evolution process of vortex. Different Atwood numbers are adjusted by different inert gas (\(\mathrm {N}_{2}\), \(\mathrm {Ar}\), and \(\mathrm {He}\), corresponding to At = 0.14, 0.26, 0.57) with identical mass flow of hydrogen. The obtained results show that combustion efficiency of the reacting cases tends to increase and then decrease, as At number increases. At = 0.26 has the best combustion efficiency which is mainly measured by the normalized mass production of water. Combustion efficiency of At = 0.26 is higher than that of other two cases because of the shorter vortex shedding distance and resulting larger burning area. Combustion performance is controlled by the mixing process. Vortex shedding position is found to play an important role in entrainment process which directly decides the combustion efficiency. The entrained oxygen can be completely consumed because of the excess hydrogen. In conclusion, shortening vortex shedding position helps improve mixing and combustion efficiency, which can be achieved by adjusting Atwood Number.

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Acknowledgements

This work is partially supported by Key Research and Development project of Sichuan Province (Grant No. 2019ZYZF0002) and the National Natural Science Foundation of China (Grant No. 91741113). We thank the Center for High Performance Computing of SJTU for providing a super computer to support this research.

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Authors and Affiliations

  1. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, China

    Chengcheng Liu, Zi’ang Wang, Bin Yu, Bin Zhang & Hong Liu

  2. Sichuan Research Institute, Shanghai Jiao Tong University, Chengdu, China

    Bin Zhang

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  1. Chengcheng Liu
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  2. Zi’ang Wang
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  3. Bin Yu
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Correspondence to Bin Zhang .

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Editors and Affiliations

  1. Shanghai Jiao Tong University, Shanghai, China

    Zhongliang Jing

  2. Shanghai Jiao Tong University, Shanghai, China

    Xingqun Zhan

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Liu, C., Wang, Z., Yu, B., Zhang, B., Liu, H. (2021). Investigation on the Effects of Atwood Number on the Combustion Performance of Hydrogen-Oxygen Supersonic Mixing Layer. In: Jing, Z., Zhan, X. (eds) Proceedings of the International Conference on Aerospace System Science and Engineering 2020. ICASSE 2020. Lecture Notes in Electrical Engineering, vol 680. Springer, Singapore. https://doi.org/10.1007/978-981-33-6060-0_3

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  • DOI: https://doi.org/10.1007/978-981-33-6060-0_3

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