Abstract
Aero-acoustic resonance in flows around flat plates is a major design concern in various practical applications, especially turbomachinery and heat exchangers, due to its significant effects on fatigue rates and radiated noises intensity. Although research has been intensive on the topic, there is still a lot to be understood for effective resonance prediction and control. Resonance in tandem plate systems is characterized by a double response. This study, investigates for the first time, the flow mechanisms responsible for the generation of low-velocity and high-velocity resonances of the double resonance response. Experimental testing and numerical simulation showed that low-velocity resonance vortices are created by normal shedding in the spacing between the plates, while high-velocity resonance vortices are formed by the interaction of vortices that are naturally shed in the gap with the downstream plate. In addition, altering the gap distance between the plates changes the flow regime responsible for the generation of resonant vortices.
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