Studies on Airframe Noise Generation at High-lift Devices in Relation to Aerodynamic Performances

Author(s):  
Yuzuru Yokokawa ◽  
Taro Imamura ◽  
Hiroki Ura ◽  
Hiroshi Uchida ◽  
Takeshi Ito ◽  
...  
Author(s):  
Roland Ewert ◽  
Juergen Dierke ◽  
Christina Appel ◽  
Michael Pott-Pollenske ◽  
Rolf Emunds ◽  
...  
Keyword(s):  

Author(s):  
Yuzuru Yokokawa ◽  
Mitsuhiro Murayama ◽  
Masahiro Kanazaki ◽  
Katsuichi Murota ◽  
Takeshi Ito ◽  
...  

Author(s):  
William Scholten ◽  
Ryan Patterson ◽  
Darren Hartl ◽  
Thomas Strganac ◽  
Jeff Volpi ◽  
...  

The leading-edge-slat on an aircraft is a significant contributor to the airframe noise during the low speed maneuvers of approach and landing. It has been shown in previous work that the slat noise may be reduced with a slat-cove filler (SCF). The objective of this current work is to determine how the SMA SCF behaves under steady flow using finite element structural models and finite volume (FV) fluid models based on a scaled wind tunnel model of a newly considered multi-element wing with a SCF. Computational fluid dynamics (CFD) analysis of the wing is conducted at multiple angles of attack, different flow speeds and high lift device deployment states. The FV fluid models make use of overset meshes, which overlap a slave mesh (that can undergo movement and deformation) unto a fixed master mesh, allowing for retraction and deployment of the slat and flap in the CFD analysis. The structural and fluid models are linked using a previously developed framework that permits the use of custom user material subroutines (for superelastic response of the SMA material) in the structural model, allowing for the performance of fluid-structure interaction (FSI) analysis. The fluid and structural solvers are weakly coupled such that the fluid solver transfers pressure data and the structural solver transfers displacements, but the physical quantities of each program are solved independently. FSI results are shown for the cases of the slat/SCF in the fully-deployed configuration as well as for the case of the slat/SCF undergoing retraction in flow.


Author(s):  
Hiroki Ura ◽  
Yuzuru Yokokawa ◽  
Taro Imamura ◽  
Takeshi Ito ◽  
Kazuomi Yamamoto

2015 ◽  
Vol 77 (21) ◽  
Author(s):  
Mohammad Hazrin Ismail ◽  
Shamsul Anuar Shamsudin ◽  
Mohd Nizam Sudin

Airframe noise reduction becomes a main interest among researchers who study the performance of aircrafts. The airframe noise can occur between the high-lift systems and main body of the airfoil. The proposed shape-changing airfoil is one of many ideas to reduce airframe noise by eliminating the gap between the main body and high-lift systems. This paper presents a new design of 30P30N airfoil, which converts the three-element airfoil (slat, main body and flap) into two-element airfoil (combination of slat and main body as an element and flap) by installing a shape-changing slat into the systems. This work applies a chain of rigid bodies connected by revolute and prismatic joints that are capable of approximating a shape change defined by a set of morphed slat design profiles. To achieve a single degree of freedom (DOF), a building-block approach is employed to mechanize the fixed-end shape-changing chain with the helped of Geometric Constraint Programming technique as an effective method to develop the mechanism. The conventional and shape-change 30P30N airfoils are compared to study the performances of airfoils with the velocity and angle of attack are constant.


Author(s):  
Yuzuru Yokokawa ◽  
Mitsuhiro Murayama ◽  
Yasushi Ito ◽  
Hiroki Ura ◽  
Dong-Youn Kwak ◽  
...  

1998 ◽  
Author(s):  
Werner Dobrzynski ◽  
Kiyoshi Nagakura ◽  
Burkhard Gehlhar ◽  
Andreas Buschbaum
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