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بخشی از متن مقاله Wind Tunnel Aerodynamic Coefficients Evaluation of RP Models based on Layer’s Thickness Affect با word :

سال انتشار: 1386

محل انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید

تعداد صفحات: 8

نویسنده(ها):

S DANESHMAND – lecturer Mechanical Engineering Department Islamic Azad University Majlessi Beranch, Isfahan, Iran
S RAHMATI – assistant Professor
R ADELNIA – lecturer

چکیده:

Nowadays, rapid prototyping (RP) methods are widely used to produce wind tunnel testing models where layer thickness is important parameter that affects aerodynamic characteristics of such wind tunnel models. This paper describes the affects of layer thickness on aerodynamic coefficients for constructed wind tunnel testing of models produced via rapid prototyping technology. Three models were evaluated, where these models were fabricated from ABSi by fused deposition method (FDM). The layer thickness applied, was 0.178mm, 0.254mm and 0.33mm. The surface roughnesses for each model were respectively 25m, 63m and 160m (RZ) that was 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 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.