Experimental verification of pulsation suppression over spiked cylinder using standard/double/inverse aerodome

Qin, Qihao; Guan, Ruiqing; Ma, Zhiyong; Xu, Jinglei

doi:10.1016/j.ast.2021.106848

Cited by 4 publications

(2 citation statements)

References 29 publications

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Section: Spiked-blunt Body Modelmentioning

confidence: 99%

“…In addition, the safe blockage ratio A m /A e of the wind tunnel was calculated based on the wind tunnel's operating Mach number Ma e and the coefficient of total pressure loss σ. The detailed derivation processes for these considerations are provided in previous research [51] conducted on this wind tunnel, with the final result expressed in the form of Equation (1): To avoid the unstart phenomenon, the diameter of blunt body D was set to 40 mm, which resulted in a blockage ratio of Am/Ae of 0.128. Based on the computational findings and the requirements of the actual experiment, the length of the cylindrical blunt body L and the spike length l were both set to D, while the spike diameter d was 0.065 D and the aerodome diameter DA was 0.36 D. These detailed parameters are documented in Table 2.…”

Section: Spiked-blunt Body Modelmentioning

confidence: 99%

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Experimental Investigation of the Shock-Related Unsteadiness around a Spiked-Blunt Body Based on a Novel DMD Energy Sorting Criterion

Wang,

Xu,

Qin

et al. 2024

Aerospace

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In this study, we propose a novel dynamic mode decomposition (DMD) energy sorting criterion that works in conjunction with the conventional DMD amplitude-frequency sorting criterion on the high-dimensional schlieren dataset of the unsteady flow of a spiked-blunt body at Ma = 2.2. The study commences by conducting a comparative analysis of the eigenvalues, temporal coefficients, and spatial structures derived from the three sorting criteria. Then, the proper orthogonal decomposition (POD) and dynamic pressure signals are utilised as supplementary resources to explore their effectiveness in capturing spectral characteristics and spatial structures. The study concludes by summarising the characteristics and potential applications of DMD associated with each sorting criterion, as well as revealing the predominant flow features of the unsteady flow field around the spiked-blunt body at supersonic speeds. Results indicate that DMD using the energy sorting criterion outperforms the amplitude and frequency sorting criteria in identifying the primary structures of unsteady pulsations in the flow field, which proves its superiority in handling an experimental dataset of unsteady flow fields. Moreover, the unsteady pulsations in the flow field around the spiked-blunt body under supersonic inflow conditions are observed to exhibit multi-frequency coupling, with the primary frequency of 3.3 kHz originating from the periodic motion of the aftershock.

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Section: Spiked-blunt Body Modelmentioning

confidence: 99%

Section: Spiked-blunt Body Modelmentioning

confidence: 99%