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Eytan J. Adler, Benjamin J. Brelje and Joaquim R. R. A. Martins
Electrified aircraft propulsion enables new aircraft designs with fewer emissions. One challenge of electrified architectures is handling the electrical components? waste heat. This is because batteries and other electrical components are sensitive to hi...
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Shiyi Pan, Jinhua Wang, Bin Liang, Hao Duan and Zuohua Huang
Hydrogen addition can improve the performance and extend the lean burn limit of gasoline engines. Different hydrogen injection strategies lead to different types of hydrogen mixture distribution (HMD), which affects the engine performance. Therefore, the...
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Sascha Kaiser, Oliver Schmitz, Paul Ziegler and Hermann Klingels
Climate Impact of Aviation.
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Judith Rosenow, Gong Chen, Hartmut Fricke and Yanjun Wang
Increasing complexity due to a constantly growing number of target functions turns air traffic trajectory optimization into a multidimensional and nonlinear task that in turn necessitates a focus on the case-sensitive most important criteria. The criteri...
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Alejandro Murrieta-Mendoza, Charles Romain and Ruxandra Mihaela Botez
Aircrafts require a large amount of fuel in order to generate enough power to perform a flight. That consumption causes the emission of polluting particles such as carbon dioxide, which is implicated in global warming. This paper proposes an algorithm wh...
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Sander Hartjes, Hendrikus G. Visser and Marco E. G. van Hellenberg Hubar
This paper presents a trajectory optimization study that has been conducted using a recently developed tool for the synthesis and analysis of extended flight formations of long-haul commercial aircraft, with the aim to minimize overall fuel consumption. ...
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Karolina Krajcek Nikolic, Petar Papoci, Dario Nikolic and Bruno Antulov-Fantulin
Fuel burn during the actual route flown is an important indicator of aircraft operational efficiency. This study aims to assess and systematically evaluate the method for fuel consumed during flights using data from the automatic dependent surveillance?b...
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Hagen Kellermann, Michael Lüdemann, Markus Pohl and Mirko Hornung
Ram air?based thermal management systems (TMS) are investigated herein for the cooling of future hybrid-electric aircraft. The developed TMS model consists of all components required to estimate the impacts of mass, drag, and fuel burn on the aircraft, i...
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Benjamin Lührs, Florian Linke, Sigrun Matthes, Volker Grewe and Feijia Yin
Air traffic contributes to anthropogenic global warming by about 5% due to CO2 emissions and non-CO2 effects, which are primarily caused by the emission of NOx and water vapor as well as the formation of contrails. Since?in the long term?the aviation ind...
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Shihai Yang, Bo Xu and Xin Li
For geostationary orbit transfers, a long duration is required using electric propulsion and a large propellant mass is needed with chemical propulsion. Hybrid transfers can achieve a balance between the fuel consumption and transfer time. In this paper,...
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Jan Erik Zeriadtke, Joël Martin and Viola Wartemann
The performance of hybrid rocket engines is significantly influenced by the fuel geometry. Burnback simulations, to determine the fuel surface and fluid volume, are therefore an important tool for preliminary design. This work presents a method for the s...
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Vincent Domogalla, Lothar Bertsch, Martin Plohr, Eike Stumpf and Zoltán S. Spakovszky
Promising low-noise aircraft architectures have been identified over the last few years at DLR. A set of DLR aircraft concepts was selected for further assessment in the context of sustainable and energy-efficient aviation and was established at the TU B...
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Landon Kamps, Kazuhito Sakurai, Yuji Saito and Harunori Nagata
Static firing tests of a hybrid rocket motor using liquid nitrous oxide (N2O) as the oxidizer and high-density polyethylene (HPDE) as the fuel are analyzed using a novel approach to data reduction that allows histories for fuel mass consumption, nozzle t...
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Robert E. Keane
Wildfire in declining whitebark pine forests can be a tool for ecosystem restoration or an ecologically harmful event. This document presents a set of possible wildfire management practices for facilitating the restoration of whitebark pine across its ra...
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Enrico Mattarelli, Carlo Alberto Rinaldini and Tommaso Savioli
Rape-seed biodiesel is an interesting option to address the problem of decreasing availability of conventional fossil fuels, as well as to reduce the CO2 emissions of internal combustion engines. The present paper describes an experimental cam...
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Kenichiro Takeishi and Robert Krewinkel
In the coming carbon-neutral era, industrial gas turbines (GT) will continue to play an important role as energy conversion equipment with high thermal efficiency and as stabilizers of the electric power grid. Because of the transition to a clean fuel, s...
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Oliver Sjögren, Tomas Grönstedt, Anders Lundbladh and Carlos Xisto
In modern turbofan engines, the bypass section of the fan stage alone provides the majority of the total thrust required in cruise, and the size of the fan has a considerable effect on the overall engine weight and nacelle drag. Thrust requirements in di...
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David I. Barton, Cesare A. Hall and Matthew K. Oldfield
Contrails are responsible for a significant proportion of aviation?s climate impact. This paper uses data from the European Centre for Medium-Range Weather Forecasts to identify the altitudes and latitudes where formed contrails will not persist. This re...
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Daniel Martinez-Sanchis, Andrej Sternin, Oskar Haidn and Martin Tajmar
Direct numerical simulations of non-premixed fuel-rich methane?oxygen flames at 20 bar are conducted to investigate the turbulent mixing burning of gaseous propellants in rocket engines. The reacting flow is simulated by using an EBI-DNS solver within an...
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Anaïs Luisa Habermann, Moritz Georg Kolb, Philipp Maas, Hagen Kellermann, Carsten Rischmüller, Fabian Peter and Arne Seitz
Hybrid-Electric Propulsion (HEP) could be part of the solution to decrease emissions associated with regional commercial aviation. This study presents results for the aircraft level fuel reduction potential of a regional turboprop concept with an HEP arc...
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