Research at DLR towards airframe noise prediction and reduction
Dobrzynski, Werner and Ewert, Roland and Pott-Pollenske, Michael and Herr, Michaela and Delfs, Jan (2007) Research at DLR towards airframe noise prediction and reduction. Aerospace Science and Technology, pp. 80-90. DOI: 10.1016/j.ast.2007.10.014.
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Official URL: http://www.elsevier.com/locate/aescte
In the final approach phase airframe noise represents the ultimate aircraft noise bar-rier for future aircraft when equipped with quiet UHBR engines. This paper summarizes the results achieved at DLR in the development of methods and tools for airframe noise prediction and reduction. Numerous DLR internal, national and EC co-financed re-search projects were conducted to investigate the aerodynamic noise of wing high-lift de-vices and landing gears, which constitute the major airframe noise contributors. Experi-mental noise source studies where performed on both scaled 2D generic and complete high-lift wing models and on an A320 full-scale wing section as well as on full-scale land-ing gears. These tests aimed at the quantification of airframe noise levels, the identifica-tion of major aeroacoustic sources and the development of noise prediction schemes. The results from these experiments provided information on the noise generation mechanisms and radiation characteristics from slats and landing gears. Devices were developed, which promise an overall airframe noise reduction potential of up to 5 dB, relative to air-frame noise levels of current aircraft. While such technologies already reach a high “technology readiness level” for landing gears, the development of noise reduction means for high-lift devices still remains in a research stage. For the development of low-noise high-lift devices for future aircraft by means of computational aeroacoustics, low-cost simulation codes were developed, validated and applied to a variety of 2D airframe noise problems.
|Title:||Research at DLR towards airframe noise prediction and reduction|
|Date:||13 November 2007|
|Journal or Publication Title:||Aerospace Science and Technology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 80-90|
|Keywords:||Airframe noise; High-lift noise; Landing gear noise; Computational aeroacoustics; Stochastic source modeling|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L VU - Air Traffic and Environment|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L VU - Air Traffic and Environment|
|DLR - Research theme (Project):||L - Quiet Air Traffic (old)|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Technical Acoustics|
Institute of Aerodynamics and Flow Technology
|Deposited By:||Dr.-Ing. Werner Dobrzynski|
|Deposited On:||26 Feb 2008|
|Last Modified:||27 Apr 2009 14:47|
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