Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.820520
Title: Hot jet noise modelling
Author: Gryazev, Vasily
ISNI:       0000 0004 9355 6197
Awarding Body: Queen Mary University of London
Current Institution: Queen Mary, University of London
Date of Award: 2020
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Abstract:
Impact of noise emissions associated with the commercial aviation poses a challenge to aircraft manufactures in the 21st century. Excessive noise levels in the vicinity of the airports and urban areas are not only annoying, but also have a direct implication for people's health. Adverse effects of aircraft noise on wildlife are also well-known. With a predicted increase of number of aircraft around the world noise pollution tends to increase accordingly. Aircraft noise is regulated by International Civil Aviation Organization (ICAO) which poses stringent noise regulations to alleviate the noise. Aircraft noise sources of aerodynamic origin include several major components, one of which that is very important for take-off conditions is noise generated by the propulsive jet flow from the engine exhaust, i.e. jet noise. Hence, predictions of jet noise is an essential component of the multidisciplinary design optimisation studies where the reduction of noise and NOx emissions is becoming a second important criterion for aeroengine design after safety. The process of noise generation in high-speed jet flow is characterised by the coexistence of a disparity of flow scales which include large-scale coherent structures and fine-scale turbulence interacting with acoustic waves whose scale is typically much larger than the that of the aerodynamic scales in the jet. All this complexity is exacerbated by incomplete understanding of turbulence properties of the anisotropic high-Reynolds number flows. Hence, understanding and prediction of jet noise is a complex task that has been a challenge for researchers since the dawn of the first aircraft. In general, jet noise is a classical problem of aeroacoustics, which solution involves knowledge from several disciplines such as fluid dynamics, applied mathematics, and computational modelling. In particular, computational modelling has become a very important tool in jet noise research since unsteady high-resolution computational methods for free-shear flow simulations have now reached a mature state. These methods can provide a wealth of information about the physics of sound generation in turbulent jet flows that can be used in further theoretical modelling.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.820520  DOI: Not available
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