Abstract
One undesirable problem in open cavity flows is the existence of strong and discrete cavity tones, especially with supersonic incoming flows.[1-4] A sound pressure level of almost 160 dB is observed for a supersonic cavity flow at Mach 2.0.[5] The strong cavity tones possibly result in structural vibrations and fatigue, adverse effects on store separation, and undesirable noise. The mechanism driving the cavity tones need to be clarified. The cavity tones are driven by self-sustained oscillations between the shear-layer instability and acoustic disturbances, which is named a feedback-loop mechanism.[6] Despite the fact that the feedback-loop mechanism itself has been well established and accepted, the dependence of cavity noise on variations of cavity configurations and flow conditions are not well-understood.[7]
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