15 research outputs found
Let’s start the clear sky revolution: Intreerede prof. dr. H. G. C. Werij
No full textAerospace Engineerin
A new dawn of aviation
No full textTo counter the climate effects of flying, we must start a revolution in aviation.Solutions must and will be found. I believe we’re at a new dawn of aviation.Aerospace Engineerin
Modelling the future of aviation: Developing a comprehensive, user-friendly model able to assessthe climate impact of policy and technological measures
No full textThe aviation sector accounted for 3.4 to 4.0% of the total anthropogenic radiative forcing in 2015. The sectors’growth is several percentage points larger than the annual fuel efficiency gain, resulting in an increasing climatechange impact. The world formulated goals for 2050 to limit anthropogenic climate change, the aviation sectorrequires a mix of fuel consumption reducing technology, increased operational efficiency and carbon offsettingto contribute to the goals.The Aviation Integrated Model (AIM) developed at the University of Cambridge resolves the impact of tech-nological and operational choices, but requires detailed knowledge of the technological development. This workis directed to retain the air traffic and fleet resolution model of AIM, while utilising a different performancemodel. Aircraft performance is modelled by technology trends to assess a range of technology options (such ashybrid electric flight or different aerodynamic configurations) at limited required knowledge while retaining themodel’s physical basis.The model uses the Breguet range equation and fuel fractions updated with Lissys’ Piano-X data to resolveaircraft fuel consumption with limited modelling error. The fuel and carbon dioxide emissions have an averagenormalised root-mean-square error of three percent compared to AIM, while nitrous oxide emissions incur a1.5% error.A case study to demonstrate the capability of the model has been performed to investigate the possibilities forhybrid electric flight serving a significant market share before 2050. The current trends in annual fuel efficiencyincrease and increase in battery specific energy do not result in a significant market share or reduction of aviationemissions for hybrid electric aircraft before 2050.To achieve a 10% decrease in carbon dioxide emissions, the annual increase of the aircraft fuel efficiency hasto be increased from 1.1% per year to 1.5% and the annual battery specific energy increase is required to goup to 5.67%. The required increase in both battery specific energy and the aircraft performance parameters issignificant, which makes a substantial reduction of emissions of the aviation sector by hybrid electric aircraftbefore 2050 improbable.Aerospace Engineerin
Energy transition in aviation: the role of cryogenic fuels
No full textAviation is the backbone of our modern society. In 2019, around 4.5 billion passengers travelled through the air. However, at the same time, aviation was also responsible for around 5% of anthropogenic causes of global warming. The impact of the COVID-19 pandemic on the aviation sector in the short term is clearly very high, but the long-term effects are still unknown. However, with the increase in global GDP, the number of travelers is expected to increase between three-to four-fold by the middle of this century. While other sectors of transportation are making steady progress in decarbonizing, aviation is falling behind. This paper explores some of the various options for energy carriers in aviation and particularly highlights the possibilities and challenges of using cryogenic fuels/energy carriers such as liquid hydrogen (LH 2) and liquefied natural gas (LNG). Flight Performance and PropulsionAircraft Noise and Climate EffectsAerospace Engineerin
The Faculty of Aerospace Engineering at Delft University of Technology
No full textThe Faculty of Aerospace Engineering is one of eight faculties at Delft University of Technology. It is one of the most comprehensive academic and innovation communities worldwide focusing on aerospace engineering. Its 120 professors and 70 researchers are mentoring and teaching around 2,800 BSc/MSc students and more than 350 PhD candidates while working in all aerospace disciplines. It’s a powerhouse in aerospace education, research, and innovation, within the top 10 in the world. Our priority themes? Sustainable aerospace, digital transformation, including Artificial Intelligence, bio-inspired engineering and smart instruments and systems. Here’s our story.Aerospace Structures & Computational MechanicsStructural Integrity & CompositesCommunication LRFlight Performance and PropulsionControl & OperationsAircraft Noise and Climate EffectsFlow Physics and TechnologySupport Aerospace EngineeringSpace EngineeringSpace Systems EgineeringAerospace Engineerin
Metamagnetic transitions in cubic La(FexAl1-x)13 intermetallic compounds
No full textCubic NaZn13-type compounds of the form La(FexAl1-x)13 were stabilised with compositions between LaFe6Al7 and LaFe12Al1. For compositions above LaFe11.2Al1.8 (x = 0.861) a low-temperature antiferromagnetic state is present in small external fields. However. upon increasing the field to a few tesla, an exceedingly sharp spin-flip transition with remarkably large hysteresis occurs to the fully saturated ferromagnetic state. The origins of this unusual metamagnetic transition are discussed in terms of the special crystal structure.
