Aeroacoustics Assessment of an Hybrid Aircraft Configuration with Rear-Mounted Boundary Layer Ingested Engine

Francesco Petrosino,Mattia Barbarino,Martin Staggat

doi:10.3390/app11072936

Francesco Petrosino, Mattia Barbarino + Show 1 more

Open Access

https://doi.org/10.3390/app11072936

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Abstract

Hybrid electric propulsion is a promising solution to reduce aircraft emissions, thus improving the sustainability of the air transport. In this work, a hybrid aircraft configuration with a rear-mounted boundary layer ingestion (BLI) engine has been investigated. The partial embedding of the engine into the fuselage generates a distortion of the ingested inflow causing additional tonal and broadband BLI noise sources, and, at the same time, alters the existing one, such as the rotor–stator interaction noise (RSI). This work is focused on the tonal RSI noise modeling, with and without the distortion generated by the BLI, and the far-field propagation including the acoustic masking contribution due to the engine–fuselage integration. As the main result, this work shows the contributions of BLI and the engine–aircraft integration on the RSI noise. Both effects should be properly taken into account in the early aircraft design stage for an effective noise reduction even at ground level.

Highlights

Environmental problems are becoming more and more evident in all human fields
The rotor–stator interaction noise (RSI) noise has been computed with the procedure of Section 3.1 by modeling the engine fan stage and, by propagating the in-duct acoustic field at the inlet and outlet of the engine nacelle
As environmental sustainability is a key problem for the air transport, electric propulsion is giving promising answers to improve the aircraft efficiency

Summary

Introduction

The rapid growth of air and urban traffic has prompted Government commissions, the scientific community, and manufacturers to invest resources to reduce the environmental impact of their systems. Innovative aircraft configurations including alternative propulsion systems should be investigated in order to achieve the 2050 goals established by the European Commission [1], that is, among the others, of 65% (−15 EPNdB) for noise reduction [2]. In this context, all benefits expected from electric propulsion require a close coupling of a detailed aircraft design with a dedicated propulsion system.

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