Papers by Keyword: Aerodynamic

Abstract: Wing-In-Ground (WIG) Effect Vehicle can be differentiated into manned and unmanned aerial vehicle. These aircraft are designed in aerodynamic shapes to enables them to glide at low altitude above the sea surface. Proper design of wings and stabilizer is crucial to provide effective lifting force with minimum total body weight. A study was conducted to determine the orientation and shape of the wing and stabilizer for a new WIG Effect vehicle prototype. Three-dimensional modeling and air flow analysis were carried out to analyze the lifting force generated under the provided body construction materials and total gross weight. In this study, two wing designs and wing orientations were studied since the WIG Effect vehicle is not equipped with wing aileron or wing flap. The first design is called as original design which suggested by industrial fabricator and the second design is called as modified design suggested from this study for design improvement. The modified wing exhibited the largest lifting force, which applied the Bernoulli’s Principle in the design. Modified wing at 20° angle of attack has been selected as the best orientation of wing.

Abstract: Aerodynamic characteristics of three supermileage car chassis with new design concepts for improving the driver’s view field and driving comfort is investigated and compared with that of one with traditional low-height design. New car shapes with shorter axle distance and higher center of gravity are created. Feasibility of the new design is verified from the aspects of rollover safety, due to the maximum crosswind speed of 40 km/h, and the drag coefficient at straight driving up to 40 km/h. The analytical verification is conducted with a commercial CFD software. Comparing to the traditional design, the analysis shows that it is possible to obtain a lower drag coefficient and lower total drag, while rollover safety is still guaranteed, for a supermileage car with wider view field and taller appearance. Reduction of the form drag is intimately related to the decrease of velocity curl in the flow direction and the size of the vortices in the wake. Results of this study can provide new concepts that are different from those used in the past for the development of supermileage cars.

Abstract: The purpose of this study is to determine the coefficient drag, C_D of the Proton PREVẾ by experimental method using Low Speed Wind Tunnel. All the relevant data are collected through the literature reviews from books and journals. First, the basic thing in aerodynamic is studied. There are two things are concern when studies aerodynamics. They were air flow and vehicle shape which we regard as aerodynamics factor that determine aerodynamic of the vehicle. Fundamental of air flow and vehicle shape is reviewed includes the relationship between air speed with pressure, boundary layer, Reynolds number, drag, lift drag and shape optimization. Wind tunnel is also studied before the experiment. Five selected speed were been tasted during the experiment to determine the C_D value.

Abstract: The problem of wind aerodynamics is solved. The experiment in a small wind tunnel was performed. The graphs of the pressure coefficients Cp on angle of attack have been determine. Significant microclimatic processes have been established.

Abstract: The purpose of this project is to study the airflow from across Proton Inspira car and evaluate the drag force and drag coefficient of the Proton Inspira car by simulation. All relevant data are collected through the literature review from book and journal. In methodology, model specification and simulation procedure is explained, together with consider assumption. Five selected speed were been input to the software to determine the C_D Value. The calculation and graphical result has been generated by the software and discussed.

Abstract: This paper is primarily concentrated with determining aerodynamic characteristics and choosing the best angle of attack at a maximum lift and low drag for the FX 63-137 aerofoil at a low Reynolds number and a speed of 20m/s and 30m/s, by using subsonic wind tunnel through manufacturing the aerofoil by aluminum alloy using a CNC machine. The proposed methodology is divided into several stages. Firstly, manufacturing the aerofoil using an aluminum alloy. Secondly, the testing process is carried out using subsonic wind tunnel. Thirdly, the results are displayed and compared with results produced from related works, in order to find out the best angle of attack at a maximum lift.

Abstract: With the increasing speed, the crosswind effect is the more and more obvious. The three dimensional aerodynamic model of the high-speed train was set up to study the aerodynamic characteristics of the train under the cross wind. Based on the vehicle system dynamics, the couple model for dynamics of wind-train-rail systems was set up to study the train safety under the wind load. The derailment coefficient and reduction rate of wheel load were analyzed under the different train speed, different wind velocity. The results of this research can provide a theoretical basis for the high-speed train safety.

Abstract: This study concerns with aerodynamic drag on a passenger car. By using computational fluid dynamics (CFD) method, we found that values of skin friction coefficients for three different parts of the car: front, top and rear parts, are different. This study addresses three different basic possible flows around a car: favourable, zero and adverse pressure gradients. Generally, cars use approximately 20% of their engine power to overcome aerodynamic drag, which is generally proportional to the frontal area. The boundary layer at each position has been analyzed to ascertain the effect of wall shear stress on the car surface. It is found that the value of wall shear stress velocity is highest at the rear part, followed by front and top parts. Subsequently, it is shown that the front part has the thinnest viscous region despite not being the part with the highest local ambient velocity compared with the top and rear parts. Despite its supposed aerodynamic shape, the rear part of the car sees separation of flow and the total drag per unit area here is the largest, twice as large as front part and more than seven times larger than the top part.

Abstract: Relative to the sports that have complex technology, basketball sport not only needs the basketball players have very good physical quality and accurate skill of passing, shooting a ball if you want to achieve process of good passing, dribbling, pitching and so on. And relative to the research angle of current way of raising level of basketball fast break and pass, the medicine ball training angle is insufficient, therefore this paper departed from the basis literature of technical of medicine ball training and basketball fast break and pass, and had research according to the universities basketball class, selected two classes to have contrast analysis of the tradition and medicine ball training, and got strong guidance of medicine ball training contributes to the improve distance and speed of basketball fast break and pass, this helps basketball coaches who can effectively use this method to improve basketball fast break and pass technology of the players, and improve the players' physical quality.

Abstract: This work presents a comparative study of aerodynamic and performance characteristics of relevant examples of low speed aircraft that have been built and flown between 1890 and 1990. As speed is related to aircraft mass and wing loading and power, the aircraft analyzed present low weight, low wing loading and low power. To generate this study a set of tools have been developed, which are specifically aimed to slow and light aircraft. One additional goal of the study is to obtain a consistent reference data basis - by using the developed tools to analyze existing aircraft - prior to use these tools in new designs with the features of low speed, low wing loading and low power.