Benjamin Lührs

Benjamin Lührs
German Aerospace Center (DLR) | DLR · Department of Air Transport Infrastructures & Processes

Dipl.-Ing.

About

49
Publications
5,285
Reads
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402
Citations
Citations since 2017
32 Research Items
366 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (49)
Preprint
Full-text available
Aviation aims to reduce its climate impact by adopting trajectories, that avoid those regions of the atmosphere where aviation emissions have a large impact. To that end, prototype algorithmic climate change functions can be used, which provide spatially and temporally resolved information on aviation’s climate impact in terms of future near-surfac...
Article
Non-CO2 effects, like ozone production and contrail cirrus formation, account for about 50-75% of aviation's climate impact, which can be effectively mitigated by re-routing flights around highly climate-sensitive areas, like ice-supersaturated regions (ISSRs). With electric drives forming no contrails and binding all life-cycle emissions to the gr...
Conference Paper
Aircraft trajectories are currently flown and optimized to reduce operating costs, keeping engine CO2-emissions from burnt fuel at a minimum by following fuel optimized routes under consideration of wind. However, research has shown that the location and time of non-CO2 emissions such as NOx, water vapor or the formation of contrail cirrus contribu...
Conference Paper
Full-text available
The aircraft’s environmental performance on fleet level is so far completely decoupled from the design process. The climate impact from aviation arising from non-CO2 effects are largely independent from CO2 emissions, but rather depend on the atmospheric state. Previously complex climate-chemistry models were used to evaluate the non-CO2 emissions...
Article
Full-text available
The strong growth rate of the aviation industry in recent years has created significant challenges in terms of environmental impact. Air traffic contributes to climate change through the emission of carbon dioxide (CO2) and other non-CO2 effects, and the associated climate impact is expected to soar further. The mitigation of CO2 contributions to t...
Article
Full-text available
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 industry is expected to maintain its trend to grow, mitigation measures are required to counteract...
Article
Full-text available
Aviation can reduce its climate impact by controlling its CO2-emission and non-CO2 effects, e.g., aviation-induced contrail-cirrus and ozone caused by nitrogen oxide emissions. One option is the implementation of operational measures that aim to avoid those atmospheric regions that are in particular sensitive to non-CO2 aviation effects, e.g., wher...
Poster
Full-text available
Given the comparably high impact of aircraft emissions, especially their non-CO2 effects, on climate in the order of 5%, aviation stakeholders are required to act to reduce the warming effects of air traffic. Besides new operational procedures, like e.g. climate-optimized routing, this demands the development of completely new global-warming optimi...
Article
Full-text available
The current push in automation, communication, and electrical energy storage technologies has the potential to lift urban mobility into the sky. As several urban air mobility (UAM) concepts are conceivable, all relevant physical effects as well as mutual interrelations of the UAM system have to be addressed and evaluated at a sufficient level of fi...
Conference Paper
Full-text available
A new concept for designing aircraft with minimum climate impact is presented. The paper describes the GLOWOPT approach, which is currently being implemented in the framework of the Clean Sky 2 programme. It aims at developing and validating so-called Climate Functions for Aircraft Design (CFAD). Those functions constitute an easy-to-use tool, whic...
Article
Full-text available
Hybrid laminar flow control (HLFC) on transport aircraft is one of many promising fuel reduction technologies. However, due to high sensitivities of HLFC toward operational boundary conditions, estimations of its overall benefit are usually afflicted with large uncertainties. Among the critical environmental factors is the degradation of laminarity...
Conference Paper
Full-text available
Within this study, the lack of incentivizing airlines to internalize their climate costs is tried to be closed by the introduction of climate-charged airspaces, as non-CO2 emissions have locationand time-dependent effects upon the climate. In order to create an incentive for airlines to minimize flight time and emissions in highly climatesensitive...
Conference Paper
Besides CO2, the climate impact of commercial aviation is strongly influenced by non-CO2 effects, which are highly sensitive to meteorological conditions and their spatial variations. To assess the cost-benefit potential (climate impact mitigation vs. cost increase) of climate and weather optimized flight trajectories in the North Atlantic flight c...
Conference Paper
Full-text available
For the first time, the algorithmic Climate Change Functions (aCCFs) for ozone, methane, water vapor, and persistent contrails have been developed within the ATM4E project to provide information on the climate sensitive regions, which can be conveniently implemented for the climate based flight routing. These aCCFs need to be verified before they a...
Conference Paper
The paper analyzes the influence of wind on the optimal rendezvous and separation points of a two-aircraft aerodynamic formation flight. For a set of origin and destination airports the optimal formation routing is determined for each day of the year 2012 using an optimal control approach and a pattern search optimization to maximize the benefits e...
Conference Paper
Within this study, a method is proposed that allows an effective fuel planning for a follower aircraft in aerodynamic formation flight missions. The special characteristic of such formation missions in the context of fuel planning is the uncertainty of the successful formation execution. The required trip fuel of the follower, therefore, strongly d...
Article
Die vorliegende Studie repräsentiert eine Nutzenanalyse für die Anwendung des vom Deutschen Wetterdienst (DWD) im LuFo V Verbundprojekt TeFiS Technologie für Flugverkehrsmanagement in großen Strukturen entwickelten Eddy Dissipation Parameter (EDP), welcher ein Maß für die atmosphärische Turbulenz darstellt.
Article
Full-text available
Comprehensive assessment of the environmental aspects of flight movements is of increasing interest to the aviation sector as a potential input for developing sustainable aviation strategies that consider climate impact, air quality and noise issues simultaneously. The purpose of this study is to present a methodology which allows to establish a mu...
Article
Full-text available
The WeCare project (Utilizing Weather information for Climate efficient and eco efficient future aviation), an internal project of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR), aimed at finding solutions for reducing the climate impact of aviation based on an improved understanding of the atmospheric impact from avia...
Article
Within this study, climate-restricted airspaces are defined in analogy to military exclusion zones. Airspaces are closed if the climate sensitivity of an area exceeds a threshold value, and affected flight trajectories are rerouted cost optimally around them. The evaluation of the concept is performed based on optimal control techniques. Therefore,...
Article
Impacts of commercial aircraft operation upon the environment, which are caused primarily from emissions of CO2CO2, NOxNOx and the formation of contrails, are matter of growing concern, as aviation is one of the fastest developing industrial sectors worldwide and the awareness of its effects is expanding. Recent research has focused on the cost-ben...
Conference Paper
The objective of this paper is to investigate the effect of cloud encounter mitigation procedures on operational and economic effectiveness of aircraft with hybrid laminar flow control (HLFC) based on real-world flight routes and weather data. The goal is to evaluate whether cloud mitigation procedures are an appropriate measure to maximize the exp...
Article
Full-text available
Aviation guarantees mobility, but its emissions also contribute considerably to climate change. Therefore, climate impact mitigation strategies have to be developed based on comprehensive assessments of the different impacting factors. We quantify the climate impact mitigation potential and related costs resulting from changes in aircraft operation...
Conference Paper
Full-text available
In the Paris Agreement 2015 (COP21, CMP11), the world's leaders have confirmed that there is a need for fundamental changes of existing patterns of production and consumption to mitigate global warming, which affects the livelihood of an increasing amount of people worldwide. Changes of these patterns involve significant economic costs, but pollute...
Conference Paper
The aviation-related climate impact share today is estimated at about 5%. Lately, very often this has provoked discussions on how to reduce the climate impact of the aviation industry especially in the area of non-CO2 components like ozone, methane and cirrus contrails. DLR has joined the global effort for environmentally sustainable aviation by ex...
Conference Paper
In order to assess the climate impact of technological and operational measures which are introduced to the future air transportation system, the future evolution of the air transportation system must be modelled and analyzed. Within the DLR-project WeCare a modular assessment framework is implemented, which accompanies a 4-layer philosophy for a g...
Conference Paper
Climate optimized flight trajectories are considered to be a promising measure to mitigate non-CO2 emissions' environmental impact, which is highly sensitive to locus and time of emission. Within this study, optimal control techniques are applied in order to determine 2D (lateral) and 3D (lateral and vertical) cost-optimized flight trajectories whi...
Conference Paper
In order to achieve global environmental goals like the 2-degree-target, as well as to reduce longer-term emission levels, mitigation measures have to be introduced, preferably as early as possible. In aviation, the implementation of the most promising mitigation strategies, e.g. climate optimized routing, is linked with several technical challenge...
Conference Paper
Full-text available
Impacts of commercial aircraft operation upon the environment, which are caused primarily from emissions of CO 2 , NO x and the formation of contrails, are matter of growing concern, as aviation is one of the fastest developing industrial sectors worldwide and the awareness of its effects is expanding. Recent research has focused on the cost-benefi...
Conference Paper
Impacts of commercial aircraft operation upon the environment, which are caused primarily from emissions of carbon-dioxide, nitrogen-oxides and the formation of contrails, are matter of growing concern, as aviation is one of the fastest growing industrial sectors worldwide and the awareness of its effects is expending. To reduce the impact of air t...
Conference Paper
Das Fliegen wird maßgeblich durch die Wind- und Wettersituation entlang des Flugweges beeinflusst. Vor diesem Hintergrund wurde das Trajectory Calculation Module (TCM) – ein bestehendes Werkzeug zur Simulation von Flugtrajektorien – dahingehend erweitert, dass im Zuge der Trajektoriensimulation anstelle von Standardatmosphären-Bedingungen auch real...
Conference Paper
Full-text available
The present paper describes a comprehensive assessment and modelling approach that was developed in the DLR project Climate compatible Air Transport System (CATS) with the goal to analyze different options to reduce the climate impact of aviation. The CATS simulation chain is applied to assess the climate impact reduction potential (via CO2, contra...
Article
Full-text available
Unsere Schulsternwarte war bei Schülerinnen und Schülern sehr beliebt und dadurch oft zu klein. So entstand im Jahr 2004 die Idee, die Sternwarte über das Internet steuerbar zu machen.

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Projects

Projects (4)
Project
The high-level objective of the GLOWOPT project is the development and validation of Climate Functions with respect to minimizing global warming and their application to the multidisciplinary design optimization of next- generation aircraft for relevant market segments