The wind tunnel behaviour of a scaled model with a gust alleviation system in a deterministic gust field

1979 ◽  
Vol 1 (3) ◽  
pp. 141-153 ◽  
Author(s):  
B. Krag
Keyword(s):  
Wind Tunnel ◽  
Scaled Model ◽  
Gust Alleviation

scholarly journals Gust Alleviation Control using Prior Gust Information: Wind Tunnel Test Results

2019 ◽  
Vol 52 (12) ◽  
pp. 128-133
Author(s):  
Yoshiro Hamada ◽  
Kenichi Saitoh ◽  
Noboru Kobiki
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Test Results ◽  
Gust Alleviation

Exploratory Wind Tunnel Gust Alleviation Tests of a Multiple-Flap Flexible Wing

2022 ◽  
Author(s):  
John Berg ◽  
Kuang-Ying Ting ◽  
Tyler J. Mundt ◽  
Marat Mor ◽  
Eli Livne ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Flexible Wing ◽  
Gust Alleviation

scholarly journals Simulating flow around scaled model of a hypersonic vehicle in wind tunnel

2016 ◽  
Vol 774 ◽  
pp. 012095
Author(s):  
T V Markova ◽  
A A Aksenov ◽  
S V Zhluktov ◽  
D V Savitsky ◽  
A D Gavrilov ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Hypersonic Vehicle ◽  
Scaled Model

scholarly journals Fully Mechatronical Design of an HIL System for Floating Devices

Robotics ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 39 ◽  
Author(s):  
Hermes Giberti ◽  
Francesco La Mura ◽  
Gabriele Resmini ◽  
Marco Parmeggiani
Keyword(s):  
Wind Tunnel ◽  
Ocean Basin ◽  
Research Field ◽  
Offshore Wind ◽  
Sea Waves ◽  
Floating Bodies ◽  
Scaled Model ◽  
Offshore Wind Turbines ◽  
Computational Fluid Dynamics Cfd ◽  
Model Subject

Recent simulation developments in Computational Fluid Dynamics (CFD) have widely increased the knowledge of fluid–structure interaction. This has been particularly effective in the research field of floating bodies such as offshore wind turbines and sailboats, where air and sea are involved. Nevertheless, the models used in the CFD analysis require several experimental parameters in order to be completely calibrated and capable of accurately predicting the physical behaviour of the simulated system. To make up for the lack of experimental data, usually wind tunnel and ocean basin tests are carried out. This paper presents a fully mechatronical design of an Hardware In the Loop (HIL) system capable of simulating the effects of the sea on a physical scaled model positioned in a wind tunnel. This system allows one to obtain all the required information to characterize a model subject, and at the same time to assess the effects of the interaction between wind and sea waves. The focus of this work is on a complete overview of the procedural steps to be followed in order to reach a predefined performance.

A Wind Tunnel Study of Heat Transfer Over Complex Terrain

2003 ◽  
Author(s):  
Michelle Pantoya ◽  
Kenneth Shifflett ◽  
Walter Oler ◽  
William Burton
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Wind Energy ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Flow Patterns ◽  
Atmospheric Conditions ◽  
Unstable Flow ◽  
Scaled Model ◽  
Atmospheric Flow

Maximizing wind energy resources requires a detailed understanding of atmospheric flow behavior over complex topography. The objective of this research is to examine unstable flow behavior over a three-dimensional topographic model, representative of mesa terrain that is common in West Texas. The goal is to develop an understanding of how unstable atmospheric conditions caused by surface heating affect boundary layer flow patterns in the natural environment. This objective was accomplished by experimentally monitoring transient thermal behavior of narrow band liquid crystals over a scaled model. Photographic data was collected as the heated model was subjected to a cooler flow field. The transient isotherms result from cooling as the model is exposed to flow in an atmospheric boundary layer wind tunnel. Results suggest that flow patterns associated with unstable conditions can be explained by increased wind speeds on the lee side of a mesa followed by vigorous mixing causing increased cooling rates around the mesa sides. The results could be used to improve the accuracy of numerical atmospheric flow models, assess the feasibility of developing wind turbine sites, and increase the knowledge-base in order to advance wind energy forecasting techniques.

Numerical investigation of the aerodynamic characteristics of a train subjected to different ground conditions

2018 ◽  
Vol 232 (10) ◽  
pp. 2371-2384 ◽  
Author(s):  
Ji-qiang Niu ◽  
Xi-feng Liang ◽  
Dan Zhou ◽  
Yue-ming Wang
Keyword(s):  
Wind Tunnel ◽  
Boundary Layers ◽  
High Speed ◽  
Rapid Development ◽  
Ground Effect ◽  
Aerodynamic Performance ◽  
Detached Eddy Simulation ◽  
Scaled Model ◽  
Ground Conditions ◽  
Ground Condition

Due to the rapid development of high-speed railways and the increasing speed of trains, the aerodynamic phenomenon caused by moving trains could be affected. Therefore, the scaled model test has been widely used to simulate the aerodynamic performance of the stationary train in wind tunnel. However, it is difficult to disregard the influence of the ground effect on the aerodynamic performance of trains. In this study, the delayed detached eddy simulation based on the shear stress transport κ–ω turbulence model is used to investigate the aerodynamic performance of trains on three ground conditions (stationary floor + stationary ballast, stationary ground + stationary ballast, and stationary ballast). The numerical method used in this paper is verified by a wind tunnel test. The way the three ground conditions influence the flow field around the train is also analyzed. The results show that the ground condition affects the thickness of the ballast boundary layers without a train, thickness of the train boundary layers, train drag, distribution of pressure and velocity along the train, and the size of the wake region; however, the ground condition had a little effect on the flow structures around the train tail. These findings can help in designing the wind tunnel experiment.

Large Scale Pressurized Water Reactor Passive Containment Cooling System Wind Tunnel Test

2019 ◽  
Vol 5 (3) ◽  
Author(s):  
Huang Jingyu ◽  
Pan Xinxin ◽  
Song Chunjing
Keyword(s):  
Wind Tunnel ◽  
Large Scale ◽  
Cooling System ◽  
Air Flow ◽  
Wind Tunnel Test ◽  
Pressurized Water Reactor ◽  
Scaled Model ◽  
Pressurized Water ◽  
Water Reactor ◽  
Wind Speeds

The objective of the current work is to shed light on studying the air flow features of the air path which is part of the passive containment cooling system (PCS) in a pressurized water reactor design. A wind tunnel test using a 1:100 scaled model is established to study the characteristic called “wind-neutrality” of the air flow in the air path, which indicates that the environmental wind should not be beneficial or detrimental to the air flow for containment cooling. Test results show that the pressure distribution in the air path is uniform, and wind speeds, wind angles, and surroundings have little effect on air flow uniformity. These investigations show that it is possible to understand air flows in the air path of PCS with a scale wind tunnel test.

Design for Wind Tunnel Testing of Scaled Model by CFD Method

2013 ◽  
Vol 275-277 ◽  
pp. 567-571
Author(s):  
Zhu Hui ◽  
Zhi Gang Yang
Keyword(s):  
Wind Tunnel ◽  
Drag Force ◽  
Wind Tunnel Testing ◽  
Force Coefficient ◽  
Scaled Model ◽  
Supporting System ◽  
Scheme Design ◽  
Testing Scheme ◽  
Cfd Method ◽  
Tunnel Testing

The numerical investigations presented in this paper deal with wind tunnel testing scheme design for 1/4 scaled MIRA model including supporting system. Based on the structure of aerodynamic and aero-acoustic full scale wind tunnel, using computational fluid dynamics (CFD), focus on MIRA model and supporting system, the drag force of scaled models and supporting system were calculated. By comparing with the wind tunnel testing results and drag force coefficient of reference, it is certain that the wind tunnel testing scheme is available and effective and that the value calculated by CFD is in good agreement with experiments.

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