Jet Noise in Airframe Integration and Shielding

Saman Salehian,Reda Mankbadi

doi:10.3390/app10020511

Abstract

This paper reviews and presents new results on the effect of airframe integration and shielding on jet noise. Available experimental data on integration effects are analyzed. The available options for the computation of jet noise are discussed, and a practical numerical approach for the present topic is recommended. Here, it is demonstrated how a hybrid large eddy simulation—unsteady Reynolds-averaged Navier-Stokes approach can be implemented to simulate the effect of shielding on radiated jet noise. This approach provides results consistent with the experiment and suggests a framework for studying more complex geometries involving airframe integration effects.

Highlights

The Federal Aviation Administration (FAA) in the U.S has implemented detailed noise certification requirements in Federal Aviation Regulation (FAR) Part 36 (5) [1]
This paper examined the available experimental investigations on the effect of propulsion airframe
This paper examined the available experimental investigations on the effect of propulsion integration on jet noise

Summary

Introduction

The Federal Aviation Administration (FAA) in the U.S has implemented detailed noise certification requirements in Federal Aviation Regulation (FAR) Part 36 (5) [1]. The maximum noise levels should not exceed the limit of 108 in effective perceived noise in decibels (EPNdB) during approach and flyover stages. Such limitations have motivated various research efforts to predict and control un-installed engine noise. Engine noise is modified as a result of the installation on the aircraft. We address here the airframe effects on the radiated noise. Our focus here is on jet–airframe (J-AF) interactions Such interactions can modify noise generation and radiation significantly, and if these effects are understood, the interaction with the airframe can even be utilized to minimize noise radiation

Methods

Results

Conclusion