An Investigation of Type IV Shock Interaction Over a Blunt Body with Forward-Facing Cavity

Xiao, Fengshou; Li, Zhufei; Zhu, Yujian; Yang, Jiming

doi:10.1007/978-3-319-46213-4_32

Cited by 1 publication

(1 citation statement)

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“…Through examining the relevant literature [ 40 , 41 , 42 ] and further analysis, we have considered that possible reasons for the low pulsation frequency are: the structural characteristics of the combustion chamber, the high temperature and high pressure exhaust gas accumulated at the bottom of the resonant cavity that will form vortices, as well as the fact that that shedding of vortices needs to interact with the high-speed flow of fresh mixture, which leads to the slow exhaust process and effects the combustion cycle time. On the other hand, whether the pulsating combustion with large amplitude pressure oscillation is high-speed detonation combustion remains to be further verified by the following experiments.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine

Song

Chen

et al. 2022

Entropy

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A shock wave focusing initiation engine was assembled and tested in an experimental program. The effective pyrolysis rate of the pre-combustor was evaluated over a range of supplementary fuel ratio in this paper. Results highlight two operational modes of the resonant cavity: (1) pulsating combustion mode, (2) stable combustion mode. The appearance of the two combustion modes is jointly affected by the flow and the structural characteristic value of the combustion chamber. This paper uses images, time-frequency analysis, and nonlinear time series analysis methods to identify and distinguish these two combustion modes. It is believed that the interaction between the combustion chamber and the supply plenum is the probable reason for different combustion modes. The experiment has found that structural parameters and import flow parameters have an impact on the initiation of the combustion chamber. Increasing the injection pressure can appropriately broaden the fuel-rich boundary of initiation. Low equivalence ratio and high injection pressure can also appropriately increase the combustion working frequency in a small range. From the perspective of pressure utilization, under the premise of ensuring successful initiation, injection pressure should not be too high.

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Section: Experimental Results and Analysismentioning

confidence: 99%