Kai Wicke

Bio: Kai Wicke is an academic researcher from German Aerospace Center. The author has contributed to research in topics: Aviation & Aircraft maintenance. The author has an hindex of 5, co-authored 26 publications receiving 139 citations.

Insect Contamination Impact on Operational and Economic Effectiveness of Natural-Laminar-Flow Aircraft

Abstract: The objective of this paper is to investigate the effect of insect contamination on operational and economic effectiveness of an aircraft with natural laminar flow wings designed by DLR. It is intended to show how insect debris located close to the wing leading edge influence fuel consumption on single missions as well as economic metrics like net present value. The focus will be on short-to-medium haul operations, i.e., aircraft similar to current state-of-the-art 150 passenger seated aircraft. During the analysis process tools for aircraft design, mission simulation and computation, insect contamination as well as life-cycle cost assessment will be used. The overall goal is to provide aircraft operators with a better understanding of the operational behavior of natural laminar flow aircraft under realistic operational boundary conditions and related economic implications.

Mission and Economic Analysis of Aircraft with Natural Laminar Flow

Abstract: The objective of this paper is the analysis and assessment of a natural laminar flow (NLF) aircraft with forward swept wings on air transport system level. In particular, the impact on fuel efficiency on single missions and on airline operational level as well as economic metrics like the net present value are of special interest. The net economic benefit for an aircraft operator gained by the operation of a NLF aircraft concept is shown, considering real-world route network conditions including existing flight routes with their respective frequencies. The focus will be on short-to-medium haul operations, i.e., aircraft similar to current state of the art 150 passenger seated aircraft. During the analysis process tools for aircraft design, mission simulation and computation as well as life-cycle cost assessment will be used.

On the Radiative Forcing by Contrails

Abstract: A parametric study of the instantaneous radiative impact of contrails is presented using three different radiative transfer models for a series of model atmospheres and cloud parameters. Contrails are treated as geometrically and optically thin plane parallel homogeneous cirrus layers in a static atmosphere. The ice water content is varied as a function of ambient temperature. The model atmospheres include tropical, mid-latitude, and subarctic summer and winter atmospheres. Optically thin contrails cause a positive net forcing at top of the atmosphere. At the surface the radiative forcing is negative during daytime. The forcing increases with the optical depth and the amount of contrail cover. At the top of the atmosphere, a mean contrail cover of 0.1% with average optical depth of 0.2 to 0.5 causes about 0.01 to 0.03 Wm−2 daily mean instantaneous radiative forcing. Contrails cool the surface during the day and heat the surface during the night, and hence reduce the daily temperature amplitude. The net effect depends strongly on the daily variation of contrail cloud cover. The indirect radiative forcing due to particle changes in natural cirrus clouds may be of the same magnitude as the direct one due to additional cover.

The Art Of The Long View

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Evaluating the climate impact of aviation emission scenarios towards the Paris agreement including COVID-19 effects.

Abstract: Aviation is an important contributor to the global economy, satisfying society’s mobility needs. It contributes to climate change through CO2 and non-CO2 effects, including contrail-cirrus and ozone formation. There is currently significant interest in policies, regulations and research aiming to reduce aviation’s climate impact. Here we model the effect of these measures on global warming and perform a bottom-up analysis of potential technical improvements, challenging the assumptions of the targets for the sector with a number of scenarios up to 2100. We show that although the emissions targets for aviation are in line with the overall goals of the Paris Agreement, there is a high likelihood that the climate impact of aviation will not meet these goals. Our assessment includes feasible technological advancements and the availability of sustainable aviation fuels. This conclusion is robust for several COVID-19 recovery scenarios, including changes in travel behaviour.