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Chapter1. Introduction 2 As mentioned before, these noise regulations serve to ensure the physical and psychological health of affected individuals. Therefore, health is the primary con- cern when analyzing acoustic immision. A continuous noise exposure can have different persistent effects on human organisms. These include syndromes like insomnia, disrupted communicational and attentional abilities and hearing loss. Moreover, affected individuals have shown a higher relative rate of allergies, car- diovascular diseases and depressions. In addition, the short-term exposure to a very loud noise source (> 85 dB) can cause lasting hearing losses, though this is not a common problem in aviation acoustics [12, 26]. Jet engine acoustics is a field of study which combines methods from acoustics and fluid mechanics to investigate acoustical phenomena of transient flows of jet engines and gas turbines. The research objective is the minimization of the detrimental effects on human health. The Department of Engine Acoustics at the Institute of Propulsion Technology at DLR is dedicated to the research of aeroa- coustic phenomena and the development noise reduction technology for modern turbo engines [6]. 1.1 Motivation In order to evaluate the influence of scarfed and serrated nozzle configurations on the propagation of jet noise, a series of stationary experiments were conducted at the QinetiQ Noise Test Facility (NTF) in Farnborough, UK in summer 2012 as part of the OPENAIR European Research Project. The experiments were carried out using different flow conditions, which reference the ICAO noise certification requirements for new aircraft. In addition, tests using a wing model scaled to the reference engine were conducted to study the influence of wing presence on the free jet. The research took place as a joint venture between Airbus, Rolls-Royce UK (RRUK) and Germany (RRD) as well as Snecma (SN), the DLR and QinetiQ (QQ).PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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