Investigation of rapid manufacturing technology with ABS material for wind tunnel models fabrication

2012 ◽  
Vol 32 (8-9) ◽  
pp. 575-584 ◽  
Author(s):  
Saeed Daneshmand ◽  
Cyrus Aghanajafi ◽  
Hossein Shahverdi
Keyword(s):  
Surface Roughness ◽  
Wind Tunnel ◽  
Raw Materials ◽  
Dimensional Accuracy ◽  
Aerodynamic Characteristics ◽  
Wind Tunnels ◽  
Rapid Manufacturing ◽  
Material Strength ◽  
Wind Tunnel Testing ◽  
Tunnel Testing

Abstract Nowadays, several procedures are used for manufacturing wind tunnel models. These methods include machining, casting, molding and rapid prototyping. Raw materials such as metals, ceramics, composites and plastics are used in making these models. Dimension accuracy, surface roughness and material strength are significant parameters which are effective in wind tunnel manufacturing and testing. Wind tunnel testing may need several models. Traditional methods for constructing these models are both costly and time consuming. In this research, a study has been undertaken to determine the suitability of models constructed using rapid manufacturing (RM) methods for use in wind tunnel testing. The aim of this research is to improve the surface roughness, dimensional accuracy and material strength of rapid manufacturing models for testing in wind tunnels. Consequently, the aerodynamic characteristics of three models were investigated and compared. The first model is made of steel, the second model from FDM-M30, and the third model is a hybrid model. Results show that metal models can be replaced by hybrid models in order to measure aerodynamic characteristics, reduce model fabrication time, save fabrication cost and also to verify the accuracy of aerodynamic data obtained in aerospace industry.

Design and Production of Wind Tunnel Testing Models with Selective Laser Sintering Technology Using Glass-Reinforced Nylon

2006 ◽  
Vol 532-533 ◽  
pp. 653-656 ◽  
Author(s):  
Saeed Daneshmand ◽  
R. Adelnia ◽  
S. Aghanajafi
Keyword(s):  
Wind Tunnel ◽  
Selective Laser Sintering ◽  
Aerodynamic Characteristics ◽  
Laser Sintering ◽  
Cnc Machining ◽  
Wind Tunnel Testing ◽  
The Cost ◽  
Force Data ◽  
Good Agreement ◽  
Tunnel Testing

In this study, the ability of Selective Laser Sintering (SLS) Technology for production of wind tunnel testing models are evaluated. It has been undertaken to determine the suitability of the Model constructed with SLS method in subsonic and transonic wind tunnel testing. Two models were evaluated in this study. The first model was fabricated from aluminum 5086-H32 by a CNC machining technique. The other model had the same section but was fabricated by the selective laser sintering (SLS) process. Aerodynamic characteristics and times as well as costs of both models were measured in 0.3 to 1.2 Mach and the results were compared. The longitudinal aerodynamic data and the normal force data obtained from SLS model showed good agreement with data obtained from the aluminum model. The greatest difference in the aerodynamic data between two models is the total axial force. The time and the cost of production are considerably reduced with use of SLS model.

scholarly journals AN AIRPLANE WITH UNCONVENTIONALLY PLACED PROPELLER POWER UNIT

2017 ◽  
Vol 57 (1) ◽  
pp. 1-7
Author(s):  
Jan Červinka ◽  
Robert Kulhánek ◽  
Zdeněk Pátek
Keyword(s):  
Wind Tunnel ◽  
Power Unit ◽  
Aerodynamic Characteristics ◽  
Full Scale ◽  
Wind Tunnel Testing ◽  
Complex Task ◽  
Model Case ◽  
Tunnel Testing

The significance of the influence of operating propellers on the aircraft aerodynamic characteristics is well-known. Wind tunnel testing of an airplane model with operating propellers is a complex task regarding the required similarity of the full-scale and the model case. Matching sufficient similarity in axial and rotational velocities in the propeller slipstream is the primordial condition for the global aerodynamic similarity of the windtunnel testing. An example of the model power units with related devices is presented. Examples of the wind tunnel testing results illustrate the extent of the propeller influence on aerodynamic characteristics of an aircraft of unconventional configuration with power units positioned at the fuselage afterbody.

Evaluation of Surface Finish Affect on Aerodynamic Coefficients of Wind Tunnel RP Models Production with ABSi Material

2008 ◽  
Vol 594 ◽  
pp. 255-260 ◽  
Author(s):  
A. Ahmadi Nadooshan ◽  
Saeed Daneshmand ◽  
C. Aghanajafi
Keyword(s):  
Wind Tunnel ◽  
Rapid Prototyping ◽  
Layer Thickness ◽  
Axial Force ◽  
Normal Force ◽  
Aerodynamic Characteristics ◽  
Wind Tunnel Testing ◽  
Aerodynamic Coefficients ◽  
Fused Deposition ◽  
Tunnel Testing

Nowadays, rapid prototyping (RP) methods are widely used to produce wind tunnel testing models and thickness of layers is an important parameter that affects the aerodynamic characteristics of model. This paper described the Affects layer thickness models product with rapid prototyping on Aerodynamic Coefficients for Constructed wind tunnel testing models. Three models were evaluated. These models were fabricated from ABSi by a fused deposition method (FDM). The layer thickness was 0.178mm, 0.254mm and 0.33mm. The roughness of surfaces for each model was 25/m, 63/m and 160/m (RZ) that determined by perthometer2. A wing-body-tail configuration was chosen for the actual study. Testing covered the Mach range of Mach 0.3 to Mach 1.2 at an angle-of-attack range of -4° to +16° at zero sideslip. Coefficients of normal force, axial force, pitching moment, and lift over drag are shown at each of these Mach numbers. Results from this study show that layer thickness does have an effect on the aerodynamic characteristics in general; the data differ between the three models by fewer than 6%. The layer thickness does have more effect on the aerodynamic characteristics when Mach number is decreased and had most effect on the aerodynamic characteristics of axial force and its derivative coefficients.

Automated wind tunnel testing

1998 ◽  
Author(s):  
William Schoenfeld ◽  
Francis Priolo
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnel Testing ◽  
Tunnel Testing
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