Acoustic Impact on Fan Flutter Characteristics in Short Aero Engine Intakes

What is it about?

Our paper addresses the topic of integrating low fan pressure ratio, wide chord propulsors into short nacelles. This topic is relevant for future engines with increased propulsive efficiency, often associated with an increased and ultra-high bypass-ratio (UHBR). In our paper we look into the problem of acoustically induced fan flutter, a challenging and real-world problem being crucial for propulsor operation which has to be understood and addressed during the design phase of the fan. We provide deep analysis of a unique data set of high fidelity results over a wide range of operational and physical parameters, taking advantage of a very efficient CFD method formulated in frequency domain. We then generalize the problem and link those CFD data to a simple analytical model to be used at very early design phases. This also helps understanding the nature of the driving physical nature.

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Photo by Ramon Kagie on Unsplash

Photo by Ramon Kagie on Unsplash