Effective Wind Tunnel Testing of Yacht Sails Using a Real-Time Velocity Prediction Program

2011 ◽  
Author(s):  
David Le Pelley ◽  
Peter Richards
Keyword(s):  
Wind Tunnel ◽  
Real Time ◽  
Full Range ◽  
Cost Effective ◽  
Recognition System ◽  
Wind Tunnel Testing ◽  
Prediction Program ◽  
Effective Manner ◽  
Accuracy And Repeatability ◽  
Tunnel Testing

Wind tunnel testing to determine yacht performance has been carried out for at least the last 50 years. A common perception is that experimental methods do not improve significantly over time. This paper shows how modern wind tunnel testing is still the only realistic way of providing a complete picture of aerodynamic performance over a full range of conditions in a rapid and cost-effective manner. The use of a Real-Time VPP and a sail shape recognition system combine to enhance the accuracy and repeatability of testing. The influence of examining boat speed instead of driving force is investigated.

Wind tunnel testing and computational fluid dynamics in FLNG and floating production system design

2016 ◽  
Vol 56 (2) ◽  
pp. 613
Author(s):  
Johnathan Green ◽  
Subajan Sivandran
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Tunnel ◽  
Numerical Modelling ◽  
Full Range ◽  
Wind Tunnel Testing ◽  
Advantages And Disadvantages ◽  
Time Histories ◽  
The Impact ◽  
Tunnel Testing

Demonstrating how numerical modelling, such as computational fluid dynamics (CFD), can be used to validate results from detailed physical wind tunnel models of FLNG vessels and floating systems is the objective of this extended abstract. 3D rapid prototyping is used to build detailed physical wind tunnel models. This physical model (normally of an approximate scale of 1:200) is then placed in a wind tunnel facility to measure the time histories of the wind loads for a full range of wind directions and a range of drafts. CFD is then used to validate the wind tunnel modelling results. Numerical modelling can also be used to analyse a number of different issues such as the impact of turbine exhaust dispersion, and turbulence on helicopter operations and resulting helideck availability. This extended abstract discusses the importance of wind tunnel testing and numerical modelling during the design phase. The idea that numerical modelling does not replace pure theoretical or experimental results, but acts to complement them with gaining a greater overall picture, will be highlighted. Findings will be presented to discuss the advantages and disadvantages of both approaches, and highlight results such as wind shear and turbulence impacts being best calculated through wind tunnel testing. The extended abstract demonstrates that, ideally during the design process, wind tunnel testing should be followed by numerical modelling to interpolate results.

scholarly journals Wind tunnel testing of additive manufactured aircraft components

2018 ◽  
Vol 24 (5) ◽  
pp. 886-893 ◽  
Author(s):  
Z.W. Teo ◽  
T.H. New ◽  
Shiya Li ◽  
T. Pfeiffer ◽  
B. Nagel ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Cost Effective ◽  
Wind Tunnel Testing ◽  
Content Type ◽  
Wind Tunnel Measurement ◽  
Measurement Results ◽  
Joined Wing ◽  
Tunnel Testing

Purpose This paper aims to report on the physical distortions associated with the use of additive manufactured components for wind tunnel testing and procedures adopted to correct for them. Design/methodology/approach Wings of a joined-wing test aircraft configuration were fabricated with additive manufacturing and tested in a subsonic closed-loop wind tunnel. Wing deflections were observed during testing and quantified using image-processing procedures. These quantified deflections were then incorporated into numerical simulations and results had agreed with wind tunnel measurement results. Findings Additive manufacturing provides cost-effective wing components for wind tunnel test components with fast turn-around time. They can be used with confidence if the wing deflections could be accounted for systematically and accurately, especially at the region of aerodynamic stall. Research limitations/implications Significant wing flutter and unsteady deflections were encountered at higher test velocities and pitch angles. This reduced the accuracy in which the wing deflections could be corrected. Additionally, wing twists could not be quantified as effectively because of camera perspectives. Originality/value This paper shows that additive manufacturing can be used to fabricate aircraft test components with satisfactory strength and quantifiable deflections for wind tunnel testing, especially when the designs are significantly complex and thin.

Automated wind tunnel testing

1998 ◽  
Author(s):  
William Schoenfeld ◽  
Francis Priolo
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Testing ◽  
Tunnel Testing
Sign in / Sign up

Export Citation Format

Share Document