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of 181
pro vyhledávání: '"Ann P. Dowling"'
Autor:
Ann P Dowling
Publikováno v:
International Journal of Aeroacoustics. 21:291-306
I first met Shôn in October 1973. I had just started Part III of the Cambridge Mathematical Tripos – a post-graduate course that was retrospectively awarded a Masters’ Degree in Mathematics. After a summer job working with Ted Broadbent on aircr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6b5a9cf89512f9e8f944b6dd55e5804
https://doi.org/10.1177/1475472x221107356
https://doi.org/10.1177/1475472x221107356
Autor:
Ann P. Dowling, Benshuai Lyu
Publikováno v:
Journal of Fluid Mechanics. 870:760-783
Jet noise is a significant contributor to aircraft noise, and on modern aircraft it is considerably enhanced at low frequencies by a closely installed wing. Recent research has shown that this noise increase is due to the scattering of jet instabilit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3c25ceedf4d4b900ebcf1ccd3b7975c
https://doi.org/10.1017/jfm.2019.268
https://doi.org/10.1017/jfm.2019.268
The present work studies the effect of entropy dispersion on the level of combustion noise at the turbine outlet of the Rolls-Royce ANTLE aero-engine. A new model for the decay of entropy waves, based on modeling dispersion effects, is developed and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fe5d7f2116fd1a8125dc2056f6454f4
Autor:
Benshuai Lyu, Ann P. Dowling
Abstract Jet noise remains a significant aircraft noise contributor, and for modern high-bypass-ratio aero-engines the strong interaction between the jet and aircraft wing leads to intensified installed jet noise. An experiment is carried out in this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f3c46eb809abe2bb67e1d5c59d969a2
Publikováno v:
AIAA Journal. 55:446-458
Entropy waves are an important source of indirect combustion noise and potentially contribute to the generation of thermoacoustic instabilities in gas-turbine combustors. Entropy fluctuations generated by unsteady combustion are known to disperse and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a499692ab478d50b80379f9af131cb9
https://doi.org/10.2514/1.j055199
https://doi.org/10.2514/1.j055199
Understanding the nature of the unsteady flow at the combustor exit is required to accurately simulate time dependent phenomena in the turbine entry, such as indirect noise generation. Using Large Eddy Simulations of the combustion process in a reali
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c62c16f79c15ffa4305c56c00c943388
https://www.repository.cam.ac.uk/handle/1810/290788
https://www.repository.cam.ac.uk/handle/1810/290788
Publikováno v:
International Journal of Aeroacoustics. 15:59-80
Air-moving devices such as fans are routinely characterised experimentally in terms of their sound power, and sound quality which depends on both broadband and tonal noise levels. The International Organization for Standardization method 5136, widely
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b36ecc4280d0d0f7cf9d50fc0c2b0cd
https://doi.org/10.1177/1475472x16630667
https://doi.org/10.1177/1475472x16630667
Autor:
Benshuai Lyu, Ann P. Dowling
A 2D temporal incompressible stability analysis is carried out for lobed jets. The jet base flow is assumed to be parallel and of a vortex-sheet type. The eigenfunctions of this simplified stability problem are expanded using the eigenfunctions of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4fd97fc5d62f1472f27f7fd12b0852b
Autor:
Benshuai Lyu, Ann P. Dowling
Jet installation causes jet noise to be amplified significantly at low frequencies and its physical mechanism must be understood to develop effective aircraft noise reduction strategies. A hybrid semi-empirical prediction model has recently been deve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f135b48e6bb78b07972fb79c271212bb
Autor:
Benshuai Lyu, Ann P. Dowling
Publikováno v:
2018 AIAA/CEAS Aeroacoustics Conference.
© 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. An analytical model is developed in this paper to model the sound due to the scattering of instability waves by an aircraft wing with a swept trailing edge.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::01870126a7f6195211b1792e647d9136
https://doi.org/10.2514/6.2018-2980
https://doi.org/10.2514/6.2018-2980