Modal analysis of morphing cavities flow based on DMD method

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 218-225.

LIU Zhe1,2, NING Fangli1,2, ZHANG Changtong1, ZHAI Qingbo1,2, DING Hui1, WEI Juan3

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Abstract

Cavity self-excited oscillation exists widely in aerospace field, andsevere pressure oscillations cause structural fatigue and damage of components inside a cavity, so it is of great significance to study the control method of cavity noise.Here,a morphing cavity was proposed, inside it a crank-slider mechanism was installed to adjust inclination angle of its bottom surface and back wall one. The flow in a morphing cavity with Mach 0.5 and low Reynolds number was simulated with the direct numerical simulation.Results showed that with increase in inclination angle of back wall surface, the modal sound pressure level and the total sound pressure level at the monitored point gradually decrease, so the flow field in the cavity is more stable and the pressure oscillation is obviously weakened; the dynamic mode decomposition (DMD) method was used to do the dynamic modal analysis of morphing cavities with different inclination angles of back wall surface, all dynamic modes show to be convergent ones, the flow tends to a stable limit cycle state with increase in inclination angle of back wall surface; dynamic mode structures corresponding to the main modal frequency are different, they show different positions of large-scale structures with positive and negative directions, with increase in inclination angle, structures’ scales gradually decrease.

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morphing cavity / cavity noise / direct numerical simulation / dynamic mode decomposition (DMD) / modal

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LIU Zhe1,2, NING Fangli1,2, ZHANG Changtong1, ZHAI Qingbo1,2, DING Hui1, WEI Juan3. Modal analysis of morphing cavities flow based on DMD method[J]. Journal of Vibration and Shock, 2020, 39(19): 218-225

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