Yue Huang  , Wubingyi Shen  ,Zhenye Luan ,Fei Xing  ,Yancheng You

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018-1021

The impact of successive increases and decreases of the equivalence ratios on unsteady characteristics in the transition of combustion modes of a hydrogen-fuelled dual-mode ramjet/scramjet combustor were simulated with DES and finite-rate chemistry model. The present studies were focused on the transient combustion features, the shock train structure and movement. The numerical results confirmed the main qualitative findings about the transition of combustion modes and wall pressure oscillation from the previous experiments. Transient interactions between shock train and multi-scale combustion for the successive decreases of the equivalence-ratios is distinguished from the inverse features of the successive increases of the equivalence-ratios. A detail flow analysis identified the factors contributing to transition of combustion modes for the varying of equivalence ratio are performed by the three dimensional flow visualization sequences.

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In Categories: HiSST 2018, Hypersonic Propulsion, Propulsion Systems and Components
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