Slat noise reduction using steady suction
WebHowever, extensive flow separation is observed on the suction side of the gap filler, which does not eliminate the noise reduction benefit due to the gap filler, but does degrade the aerodynamic performance of the high-lift configuration. ... This change accounts for the reduction in slat noise as measured in previous work. Document ID ...
Slat noise reduction using steady suction
Did you know?
WebJun 25, 2024 · Slat geometry modifications associated with the treatments alter the flow field in the region that dominates the generation of the acoustic field. Three angles of attack (alpha_k = 8, 10, and... WebThe turbulent flow around a high-lift configuration consisting of slat, main element and flap is simulated at a Reynolds number of 1.7 × 10 6 with an implicit finite-volume based …
WebAug 16, 2013 · A new approach, mass injection near the slat cusp, is proposed for the suppression of slat noise. The mechanism and efficiency of the slat noise suppression … WebFeb 5, 2015 · The efficiency and mechanism of slat noise suppression with upstream mass injection was investigated through validated numerical simulations. Delayed detached …
WebJun 1, 2010 · The computations show that the presence of the “blade” seal at the cusp in the simulated geometry significantly changes the slat cove flow dynamics, reduces the … WebApr 1, 2013 · The control effect of air suction on slat noise was numerically studied by Knacke and Thiele. 65 By using steady suction at the inner slat surface, they …
WebThe first approach was to reduce the slat noise using air blown on the suction surface of the slat near its trailing edge. A numerical simulation showed that the slat noise levels over most of the frequencies, especially above a St number of 7, were obviously attenuated.
WebWhen the slat is extended, HIGH-LIFT NOISE REDUCTION USING PLASMA ACTUATORS there is a region of flow separation in its cove in which instabilities and vorticities are generated and interact with the nearby surfaces, generating noise [14, 16, 13]. sylvia rowlandWebSep 9, 2024 · The novelty of the present study is the use of finlets for slat noise reduction, which falls under the scope of cavity noise. This paper aims to present a comprehensive experimental analysis on the aeroacoustic characteristics of slat finlets with different spacings. Unsteady surface pressure measurements and far-field noise measurements … sylvia ruscheWebApr 7, 2024 · It is demonstrated that the dominant features of the flap side-edge flow are the double vortex structures, and the new passive blowing air reduction method can achieve about 3.3 dB noise... sylvia rowleyWebSep 13, 2024 · The slat cusp extensions barely affect the mean C p distribution, whereas the longest extension achieves up to a 5.4 dB reduction in the overall sound pressure level. The slat-cove filler yields an even higher noise reduction that … sylvia rowland robertsWebSep 26, 2014 · A rigid and none actuated adaptive slat was mounted at the inboard station of the high lift system in two setting positions. The first one was an intermediate position providing a gap reduction of about 45%. The second was the … t. f. twoWebMar 1, 2024 · The slat and flap chords are approximately equal to 15% c and 30% c, respectively. In the present study, the slat and flap deflections are both 30 ° for the … sylvia ruth gutmannWebGiven the basic knowledge of the slat flow field, a variety of noise reduction techniques have been studied. The aim is to either reduce the region of flow unsteadiness or alter their position such that they minimally interact with the airfoil surfaces. sylvia savage of woolwich maine