Study and experimental measurement of the drag coefficient of the hull of an underwater drone by means of a wind tunnel

2024-12-17T21:26:46+00:00

The present work aims to study, design and characterize the hull of a submarine drone by means of experimental measurement in a wind tunnel. For this purpose, the concept design of the prototype was carried out, which was built using additive manufacturing. The experimental runs were performed for two types of surfaces, flat and cylindrical, on the drone hull head. Using the Re determined the test velocities in air were 8, 10, 12, 14 and 16 m/s. From the experimental runs, the drag force, was measured, and from the adjustment, it was estimated that the bias error is less than 6%, so it can be said that the error in the measurements is acceptable, and the scaling of the results can be performed. The results of the drag coefficient showed the reduction by boundary layer growth and from the comparison of the planar and cylindrical gemetires on the dron hull head showed that the of the cylindrical surface is 33.14 and 10.71% larger compared to the of the planar surface. To validate in a better way the obtained results were copared with other designs of hull geometries have a lower , approximately 63.33%, therefore this design does not present the best result in drag comparison with these surfaces, in the comparison with drones that do not have hull and are geometries of rectangular section, 97.48% less drag, therefore it can be indicated that this design has a better performance in comparison with these geometries. Finally, it can be concluded that the geometry proposed in this study has the necessary length to reduce drag due to a boundary layer with a flat surface to have improved performance compared to drones that do not have hull.

Design and manufacture of electric vehicle body with solar panels for urban use

2024-12-18T18:25:41+00:00

The automotive industry faces the urgent need to reduce environmental impact and mitigate climate change. One alternative in this fight is the use of the urban Electric Vehicle (EV), a compact, low-speed, and more economical vehicle. One of the major challenges is the integration of solar panels into the EV's body to improve its energy autonomy. This work presents the design of an ultra-compact EV body, created in SolidWorks and rendered with 3D Blender software. The area irradiated by the sun is estimated to place flexible solar panels on the hood and roof of the EV and to understand their contribution to the vehicle's energy autonomy. Finally, the manufacturing process of the monocoque fiberglass body is described. The aforementioned concepts aim to make the EV more cost-effective and practical for urban mobility. The plans obtained in SolidWorks provide the measurements and details for both the solar exposure energy calculation and the fiberglass manufacturing process, which includes a model in polystyrene and the body prototype according to the final aerodynamic design. The process highlights the use of clay in modeling the EV instead of automotive clay, which is much more expensive and polluting.

Revista de Ciencias Tecnológicas

Study and experimental measurement of the drag coefficient of the hull of an underwater drone by means of a wind tunnel

Design and manufacture of electric vehicle body with solar panels for urban use