<title>CRYSTAL camera: an infrared prototype instrument for flow visualization between 90 and 313 K has been installed in a cryogenic wind tunnel</title>

With the increasing requirement of Reynolds number simulation in wind tunnel tests, the cryogenic wind tunnel is considered as a feasible method to realize high Reynolds number. Characteristic model-based adaptive controller design method is introduced to flow field control problem of the cryogenic wind tunnel. A class of nonlinear multi-input multi-output (MIMO) system is given for theoretical research that is related to flow field control of the cryogenic wind tunnel. The characteristic model in the form of second-order time-varying difference equations is provided to represent the system. A characteristic model-based adaptive controller is also designed correspondingly. The stability analysis of the closed loop system composed of the characteristic model or the exact discrete-time model and the proposed controller is investigated respectively. Numerical simulation is presented to illustrate the effectiveness of this control method. The modeling and control problem based on characteristic model method for a class of MIMO system are studied and first applied to the cryogenic wind tunnel control field.

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Supersonic Nonequilibrium Plasma Wind-Tunnel Measurements of Shock Modification and Flow Visualization

AIAA Journal ◽

10.2514/2.841 ◽

2000 ◽

Vol 38 (10) ◽

pp. 1879-1888 ◽

Cited By ~ 31

Author(s):

R. Yano ◽

V. Contini ◽

E. Plonjes ◽

P. Palm ◽

S. Merriman ◽

...

Keyword(s):

Wind Tunnel ◽

Flow Visualization ◽

Nonequilibrium Plasma ◽

Wind Tunnel Measurements

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Thermal analysis of cryogenic wind tunnel models

10.2514/6.1984-1802 ◽

1984 ◽

Author(s):

A. CARLSON

Keyword(s):

Thermal Analysis ◽

Wind Tunnel ◽

Cryogenic Wind Tunnel

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A Study of Potential Test Capabilities of the NASA Langley 0.3-Meter Transonic Cryogenic Wind Tunnel

30th AIAA Aerodynamic Measurement Technology and Ground Testing Conference ◽

10.2514/6.2014-2654 ◽

2014 ◽

Author(s):

Ben D. Phillips ◽

Colin P. Britcher

Keyword(s):

Wind Tunnel ◽

Cryogenic Wind Tunnel ◽

Potential Test

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Feasibility of airfoil tests with a small high subsonic cryogenic wind tunnel

ICIASF 99. 18th International Congress on Instrumentation in Aerospace Simulation Facilities. Record (Cat. No.99CH37025) ◽

10.1109/iciasf.1999.827174 ◽

2003 ◽

Author(s):

Y. Yamaguchi ◽

M. Kashitani ◽

K. Kaibara ◽

T. Saito

Keyword(s):

Wind Tunnel ◽

Cryogenic Wind Tunnel

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Improvements in the Power Output of a Horizontal Axis Wind Turbine Due to the Introduction of a Curved Blade

Volume 2: Symposia and General Papers, Parts A and B ◽

10.1115/fedsm2002-31255 ◽

2002 ◽

Author(s):

Erin K. Clarke ◽

Sylvester Abanteriba

Keyword(s):

Wind Tunnel ◽

Flow Visualization ◽

Wind Turbine ◽

Power Output ◽

Turbine Blades ◽

Horizontal Axis Wind Turbine ◽

Modified Model ◽

Curved Blade ◽

Generation Capacity ◽

The Impact

This paper examines the impact on the power generation capacity of a wind turbine as a result of the modification of the shape of the blades of an existing wind turbine. The modification involves curving the blades in the direction of rotation resulting in an increase in generated lift and therefore an increase in the power output of the wind turbine. Two three-bladed models were tested in a wind tunnel, one original straight-bladed model and one modified model both of which were 0.84 m in diameter. A study of the methods of flow visualization for a wind turbine in a wind tunnel was investigated. The corresponding results are presented. It was discovered that the china clay method of flow visualization in conjunction with a strobe light gave a good indication of the direction of the airflow over the turbine blades as did condensed oil droplets from a smoke wand which presented a very clear indication of the span-wise flow. It was concluded from the investigation that curving the blade into the direction of rotation on a wind turbine produced a greater power output at the same wind speed as an unmodified wind turbine.

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