On bio-inspired induced drag reduction techniques

The current study was aimed at identifying wing planform geometries which favours low induced drag. The geometries were defined by mathematical functions and following a subsequent parametric study, with a focus on sweep angle and taper ratio, inspired by birds wings and aquatic animals flukes or caudal fins planforms. The parametric studies were carried out using a vortex lattice method (VLM) which was validated with experimental data from literature. The main finding is a confirmation of the fact that the maximum Oswald efficiency factor, e is not exclusive to an elliptical wing planform. Despite its apparent simplicity, in fact a swept-back-tapered wing with a linear chord distribution can reach e = 1, the limit or minimum induced drag established from elliptical lift distribution. Moreover, the crescent wing geometry, such as the one displayed by the swift, can even surpass this limit

Oxicombustión en motores de encendido provocado con producción de oxígeno in-situ mediante membranas de separación

[ES] Las emisiones contaminantes generadas por la actividad humana constituyen uno de los principales problemas medioambientales de la actualidad, motivo por el cual en los últimos años se han incrementado los esfuerzos en su control y reducción. Una de las tecnologías desarrolladas en los últimos años como medio para la reducción de la emisión de NOx y la captura de CO2 en los procesos de combustión, es la oxicombustión sin nitrógeno. El presente proyecto aborda el estudio de esta tecnología e investiga la viabilidad de su aplicación en motores de encendido provocado destinados a aplicaciones móviles.[EN] Pollutant emissions generated by human activity are one of the main environmental problems of today, beause of that, the efforts to control and reduce them have increased in recent years. One of the technologies developed in recent years as a way to reduce the emission of NOx and the capture of CO2 in combustion processes, is oxycombustion without nitrogen. This project addresses the study of this technology and investigates the feasibility of its application in spark-ignition engines intended for mobile applications.[CA] Les emissions contaminants generades per l’activitat humana constitueixen un dels principals problemes mediambientals de l’actualitat, motiu pel qual en els últims anys s’han incrementat els esforços en el seu control i reducció. Una de les tecnologies desenvolupades al llarg dels últims anys com mitjà per a la reducció de l’emissió de NOx i la captura de CO2 en els processos de combustió, és l’oxicombustió sense nitrogen. El present projecte aborda l’estudi d’aquesta tecnologia i investiga la viabilitat de la seua aplicació en motors d’encés provocat destinats a aplicacions mòbils.Cuenca Alcocel, I. (2020). Oxicombustión en motores de encendido provocado con producción de oxígeno in-situ mediante membranas de separación. Universitat Politècnica de València. http://hdl.handle.net/10251/148619TFG

On bio-inspired induced drag reduction techniques

International audienceThe current study was aimed at identifying wing planformgeometries which favours low induced drag. Thegeometries were defined by mathematical functions andfollowing a subsequent parametric study, with a focuson sweep angle and taper ratio, inspired by birds wingsand aquatic animals flukes or caudal fins planforms. Theparametric studies were carried out using a vortex latticemethod (VLM) which was validated with experimentaldata from literature. The main finding is a confirmationof the fact that the maximum Oswald efficiency factor, eis not exclusive to an elliptical wing planform. Despiteits apparent simplicity, in fact a swept-back-tapered wingwith a linear chord distribution can reach e = 1, the limitor minimum induced drag established from elliptical liftdistribution. Moreover, the crescent wing geometry, suchas the one displayed by the swift, can even surpass thislimit