CEAS Aeronautical Journal

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Data parser approaches for (online) parameter estimation
CEAS Aeronautical Journal - Tập 5 - Trang 345-357 - 2014
Christoph Deiler
Finding maneuvers for parameter estimation in flight data records is a laborious task and traditionally performed post-flight on ground. Two different data parser approaches to automatically detect these maneuvers in flight are presented. Both methods search the control input signals for significant changes that correspond to test maneuvers. The first algorithm is based on the signal time derivati...... hiện toàn bộ
Propeller and inflow vortex interaction: vortex response and impact on the propeller performance
CEAS Aeronautical Journal - Tập 7 - Trang 419-428 - 2016
Yannian Yang, Teng Zhou, Andrea Sciacchitano, Leo Veldhuis, Georg Eitelberg
The aerodynamic operating conditions of a propeller can include complex situations where vorticity from sources upstream can enter the propeller plane. In general, when the vorticity enters in a concentrated form of a vortex, the interaction between the vortex and blade is referred to as blade–vortex interaction or BVI. The interaction may affect the propeller performance as well as its noise prod...... hiện toàn bộ
Influence of a back-flow flap on the dynamic stall flow topology
CEAS Aeronautical Journal - Tập 9 - Trang 39-51 - 2017
C. C. Wolf, A. D. Gardner, C. B. Merz, S. Opitz
Dynamic stall is a major concern for highly loaded helicopter rotors in fast forward flight. The potential of a back-flow flap for dynamic stall reduction is investigated. The flap assembly is mounted on the suction side of a helicopter main rotor-blade airfoil undergoing deep-stall pitch oscillations. Wind-tunnel experiments using high-speed particle image velocimetry were conducted to identify t...... hiện toàn bộ
Review of flight simulation fidelity requirements to help reduce ‘rotorcraft loss of control in-flight’ accident rates
CEAS Aeronautical Journal - Tập 12 - Trang 701-721 - 2021
Mark D. White, Gareth D. Padfield, Linghai Lu, Sunjoo Advani, Mario Potter
This paper examines the fidelity requirements for flight simulators to improve training and address the problems associated with rotorcraft loss of control in-flight (LOC-I). To set the context, trends in rotorcraft accident statistics are presented. The data show that, despite recent safety initiatives, LOC-I rotorcraft accidents have been identified as a significant and growing contribution to a...... hiện toàn bộ
The HART II international workshop: an assessment of the state of the art in CFD/CSD prediction
CEAS Aeronautical Journal - - 2013
Marilyn J. Smith, Joon W. Lim, Berend G. van der Wall, James D. Baeder, Robert T. Biedron, D. Douglas Boyd, Buvana Jayaraman, Sung Nam Jung, Byung-Young Min
Influence of engine modeling on structural sizing and approach aerodynamics of a circulation controlled wing
CEAS Aeronautical Journal - Tập 9 - Trang 219-233 - 2018
Kay Sommerwerk, Benedikt Michels, Matthias C. Haupt, Peter Horst
Extended configurations of a short take-off and landing aircraft under investigation at the Coordinated Research Centre SFB 880 include a morphing droop nose and a tractor propeller engine. The short take-off and landing capabilities are achieved by circulation control via a high velocity jet over the flap leading edges utilizing the Coandǎ effect. The effect of the engine integration in combinati...... hiện toàn bộ
Thank you to our CEAS Aeronautical Journal reviewers
CEAS Aeronautical Journal - - 2024
Cornelia Hillenherms, Andrea Dieball
Design considerations for the components of electrically powered active high-lift systems in civil aircraft
CEAS Aeronautical Journal - Tập 6 - Trang 49-67 - 2014
S. H. Teichel, M. Dörbaum, O. Misir, A. Merkert, A. Mertens, J. R. Seume, B. Ponick
To address the challenges of future air traffic, such as more accessible air travel with better public acceptance, this research work focuses on efficient active high-lift systems (AHLS). This system applies boundary layer suction combined with a controlled Coanda jet. Electrically powered compressors are located in the wings at each flap to supply the suction and blowing air mass flow rate to the...... hiện toàn bộ
Sensitivity and calibration of turbulence model in the presence of epistemic uncertainties
CEAS Aeronautical Journal - Tập 11 - Trang 33-47 - 2019
Andrea Da Ronch, Marco Panzeri, Jernej Drofelnik, Roberto d’Ippolito
The solution of Reynolds-averaged Navier–Stokes equations employs an appropriate set of equations for the turbulence modelling. The closure coefficients of the turbulence model were calibrated using empiricism and arguments of dimensional analysis. These coefficients are considered universal, but there is no guarantee this property applies to test cases other than those used in the calibration pro...... hiện toàn bộ
System analysis of aircraft with natural laminar flow and forward swept wings
CEAS Aeronautical Journal - Tập 7 - Trang 259-274 - 2016
Kai Wicke, Volker Gollnick
The objective of this paper is an enhanced analysis and assessment of a short-to-medium range aircraft configuration with natural laminar flow (NLF) and forward swept wings (FSW) designed by DLR. It is intended to show how the proposed aircraft concept could contribute to a more economic and ecologic operation. By implementing a multidisciplinary simulation and assessment framework, the net-benefi...... hiện toàn bộ
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