The problem investigated in this experiment was which height of Gurney Flap gives the best lift improvement on an airfoil without increasing drag. The Gurney Flaps' heights are determined as a percentage of the airfoil's chord length. The hypothesis is that a Gurney Flap will produce the best lift to drag ratio when its height is two percent of the airfoil's chord length. The hypothesis was tes...

in this paper, inflow turbulence effects on the flow wake parameters around a naca0012 airfoil at zero incidence angle and reynolds number of 38,700 were investigated. various turbulence promoter networks were used to achieve turbulence intensity of 5% and 6%. experiments have been conducted for three different turbulence intensities in which mean velocity parameters, turbulence intensity, freq...

Under the right parameters, flutter occurs in an airfoil when aerodynamic forces drive a dynamic structure to an oscillatory, possibly divergent condition. The presence of a rotational stiffness nonlinearity at the root of an all-moving airfoil has been shown to decrease the freestream velocity at which flutter occurs. Since this is a somewhat common configuration for flight structures and othe...

Direct numerical simulations were performed to study the effect of an elastically mounted trailing edge actuator on the unsteady flow over a plunging, thin airfoil at Reynolds number of 14700 based on the chord length. The goal is to investigate potential benefits of flow-induced passive actuation of the trailing edge to the lift and drag characteristics of flapping MAV wings. The trailing edge...

In this study, efficient global optimization (EGO) with a multi-fidelity hybrid surrogate model for multi-objective optimization is proposed to solve multi-objective real-world design problems. In the proposed approach, a design exploration is carried out assisted by surrogate models, which are constructed by adding a local deviation estimated by the kriging method and a global model approximat...

A NUMBER of military and civilian applications require efficient operation of airfoils in low chord Reynolds numbers. The applications include propellers, sailplanes, ultralight mancarrying/man-powered aircraft, high-altitude vehicles, wind turbines, unmanned aerial vehicles, and micro air vehicles. Careful management of boundary layers on low-Reynolds-number airfoils is required to alleviate t...

la a rather aeaeral sense, ia"erse airfoU desila caa be takea to meaa the problem of speclfyinl a desired set of airfoU characteristics, sudl as tbe airfoU maxima .. tblekaess ratio, pltchlal moment, part of tbe "e1oclty distributioa, or bouadary-layer develop_t. From tills laformatloa, the correspoadinl airfoU shape is determiaed. This paper presents a metbod tbat approacha tbe desiga problem ...

<p>Airfoil telah mengalami banyak perkembangan dan optimalisasi melalui berbagai cara. Terdapat teknik yang dapat digunakan untuk memodifikasi bentuk arifoil standar ada saat ini. Metode PARSEC merupakan salah satu parameterisasi paling airfoil. Paper ini menyediakan penjelasan komprehensif.mengenai implementasi metode pada bahasa pemrograman <em>python</em>. Studi menggunakan...

In this paper, we further develop the theory of complete mixability and joint mixability, we provided sufficient conditions for certain univariate distributions with oneside unbounded support that are not joint mixable and complete mixable. An alternative proof to a result of Wang and Wang (2016) which related to the joint mixability of elliptical distributions with the same characteristic gene...

A computational fluid dynamic (CFD) study compared two configurations of distal anastomosis of 12 mm Contegra conduit: conventional 'circular' vs. oblique 'elliptical' anastomosis extended on the left PA, evaluating pressure and velocity profiles, and shear stress, from PA origin to the bifurcation. 'Elliptical' anastomosis provides larger (=54% difference) cross-sectional area than 'circular' ...