Wall Interference Correction Method for Kevlar Wall Test Section

2020 ◽  
Vol 57 (5) ◽  
pp. 889-900
Author(s):  
Hiroki Ura ◽  
Masashi Shigemi ◽  
Tomonari Hirotani ◽  
Tomoyuki Homma
Keyword(s):  
Test Section ◽  
Correction Method ◽  
Interference Correction

Global wall interference correction and control for the NWTC Transonic Test Section

1997 ◽  
Author(s):  
W. Sickles ◽  
F. Steinle, Jr. ◽  
W. Sickles ◽  
F. Steinle, Jr.
Keyword(s):  
Test Section ◽  
Interference Correction ◽  
And Control

Testing Three-Dimensional Bluff-Body Models in a Low-Speed Two-Dimensional Adaptive Wall Test Section

1995 ◽  
Vol 117 (4) ◽  
pp. 546-551 ◽  
Author(s):  
D. Sumner ◽  
E. Brundrett
Keyword(s):  
Drag Coefficient ◽  
Test Section ◽  
Bluff Body ◽  
Three Dimensional ◽  
Correction Method ◽  
Blockage Ratio ◽  
Two Dimensional ◽  
Interference Effects ◽  
Low Speed ◽  
Straight Wall

Thin, sharp-edged disk models were evaluated in a low-speed two-dimensional adaptive flexible wall test section to determine the optimum adaptive wall testing environment for three-dimensional bluff-body models, by providing model testing recommendations for nominal solid blockage ratio and model span ratio. Drag coefficient measurements obtained under straight wall and adapted wall conditions showed that for a two-dimensional adaptive wall test section, the model span ratio imposes a more severe restriction upon model size than does the nominal solid blockage ratio. Minimum wall interference conditions were achieved with adapted walls for nominal solid blockage ratios less than 3 percent and model span ratios less than 21 percent, independent of the nominal test section aspect ratio, based on favorable comparison with previously-published experimental data. Data obtained under straight wall conditions confirmed that wall interference effects can only be neglected in conventional, straight-walled test sections for solid blockage ratios less than 0.5 percent and model span ratios less than 10 percent. The post-test boundary correction method of Maskell was successfully used to adjust the straight wall test section drag coefficient measurements of the larger models for wall interference effects, but no direct measurements of wall interference are used with this method. The results support the careful use of a two-dimensional wall adjustment strategy for three-dimensional nonlifting flows.

Evaluation of Wall-Interference Correction Method Using Numerical Analysis and Porous Wall Model

2015 ◽  
Vol 52 (1) ◽  
pp. 226-234 ◽  
Author(s):  
Taisuke Nambu ◽  
Atsushi Hashimoto ◽  
Makoto Ueno ◽  
Keiichi Murakami ◽  
Tetsuya Sato
Keyword(s):  
Numerical Analysis ◽  
Porous Wall ◽  
Correction Method ◽  
Wall Model ◽  
Interference Correction

Research on the Interference Correction in the CNC Incremental Forming Based on Iterative Algorithm

2014 ◽  
Vol 988 ◽  
pp. 305-308
Author(s):  
Hu Zhu ◽  
Hua Yi Li ◽  
Wei Zhang
Keyword(s):  
Iterative Algorithm ◽  
Correction Method ◽  
Correction Angle ◽  
One Dimensional ◽  
Accuracy Requirement ◽  
Cnc Incremental Forming ◽  
Interference Correction ◽  
The Given ◽  
Location Point

Aiming at the problem of the interference of extrusion tool handle and workpiece in the process of 5-axis CNC sheet forming, an interference correction method based on one-dimensional searching algorithm of iterative of optimal design is presented in this paper. Using the iterative algorithm, the optimal critical posture of extrusion tool which the interference is corrected with the given accuracy requirement is found out, and then the interference correction angle is calculated. Taking the cutter location point (CLP) as a rotation center, the extrusion tool is rotated the correction angle to achieved interference correction. The case study shows that this method is simple, effective and it can correct the interference with the given accuracy value.

WALL-INTERFERENCE CORRECTION FOR THE SURFACE-PRESSURE HYSTERESIS OF AN AIRFOIL UNDERGOING PLUNGING MOTION

2015 ◽  
Vol 39 (2) ◽  
pp. 293-305
Author(s):  
Mohammad Saeedi ◽  
Mahmoud Mani ◽  
Armin Hamta
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Test Section ◽  
Wind Tunnels ◽  
Far Field ◽  
Wind Tunnel Experiments ◽  
Interference Correction ◽  
Dimensional Parameters ◽  
Conventional Test ◽  
The Difference

In the current research, the results of a number of wind-tunnel experiments on a moving airfoil with plunging motion are presented. The experiments have been conducted in two different configurations which are tunnels with conventional and slotted test-section walls to provide resemblance to a far-field condition. The difference in results obtained from two test-section configurations can be considered as the wall effect and regulated as a function of non-dimensional parameters which can be further used for correcting experimental results obtained from conventional wind tunnels. When the derived correction factor is applied to a numerical simulation of a wind tunnel with a conventional test section (for points located in the front portion of the airfoil), the resulting pressure variations closely resembled that of a far-field numerical simulation. This methodology showed promising results for the specific configurations used in this research.

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