超音速キャビティ流れにおけるフィードバックループメカニズムの解析と圧縮波の分類(乱流(2),一般講演)

概要

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Implicit large-eddy simulations were conducted to clarify the feedback-loop mechanism when supersonic flows past a three-dimensional rectangular cavity with length-to-depth ratio of 2. One feedback-loop cycle was visualized and described using phase-averaged flowfields. Results clearly showed the causality between the leading-lip shedding vortex and acoustic forcing. Mach wave reflection at the aft wall was turned out to be the generation mechanism of feedback acoustic waves. It was confirmed by investigating time-series instantaneous flowfields and autocorrelation coefficients of three simulation cases at different convective Mach numbers. Components of compression waves in supersonic cavity flows were summarized. Proper orthogonal decomposition (POD) in frequency domain was firstly employed for the analysis of compression wave propagation inside cavity. Results illustrated that the propagation of notable compression waves inside cavity is greatly affected by the high-speed recirculation flows.
2010-09-09