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Development of vortex wake visualization/detection methods via radiation and scattering fields sensing

Ziel

To develop possible variants of visualization / detection of airplane vortex wake by means of utilizing of the following physical effects: thermal contrast of a vortex wake relative to surrounding atmosphere; emission / absorption of electromagnetic waves by small clusters of water molecules (mainly, by water dimers) contained in an airplane vortex wake; scattering of laser radiation by aerosols in moving air.
Background. The evolution of aircraft vortex wake is often accompanied by temperature heterogeneity in the wake caused by several physical phenomena, the presence of molecular clusters in engine exhaust products in aircraft wake and also by moving aerosols .
These reasons lead to necessity of theoretical development of appropriate physical model of vortex wake and corresponding thermovision method of its visualization, detection of vortex wake by clusters emission spectra in radiowave, microwave and far IR regions and also to possibility of development of advanced laser airborne and ground-based wake vortex avoidance systems.
Basic problems
Task T1. Development of thermal portraits of airplanes vortex wakes;
Task T2. Study of possibilities of visualization of a vortex wake by detection of water clusters emission / absorption of electromagnetic radiation;
Task T3. Conceptual development of advanced laser airborne and ground-based wake vortex avoidance systems.

Research teams
Central Aerohydrodynamic Institute (TsAGI) team;
Institute of Aircraft Equipment (NIIAO) team;
Moscow Institute of Physics and Technology (MIPT) team;
Institute of Atmospheric Physics (IAP) team
Research activities include:
analysis and selection of existing experimental data and theoretical models o wake vortices interaction with undisturbed atmosphere and with exhaust jets of aircraft; theoretical development of appropriate models of thermal fields in aircraft jet-vortex wakes for various modes of flight, modelling of spatial and temporal indicatrix of possible distances for sensing of thermal radiation of aircraft vortex wake.
calculations of emission/absorption spectra of water dimers including classical trajectory calculations of H2O-H2O collisions based on Hamilton equations and real intermolecular potential; Monte-Carlo simulation of initial conditions for collisions, line-by-line computations of high-resolution vibration-rotational spectra in equilibrium (background) and nonequilibrium (dimers) conditions, utilizing HITRAN database for atmospheric molecules, comparison of absorption spectra of water dimers and spectra of background atmospheric compounds in typical aircraft wake conditions; selection of frequencies with maximum spectral contrast of dimers against background.
analysis of existing experimental data and theoretical models of laser emission interactions with disturbed atmosphere; theoretical development of models of appropriate interactions of laser emission and aircraft vortex wake, investigation of information possibilities of these interactions, determination of functioning conditions of possible laser systems, metrology and technical characteristics investigations of such systems.
Expected results:
recommendations for optimal distances and directions needed for thermovision detection of aircraft vortex wake;
frequencies for optimal detection of water dimers in aircraft wake; distances needed for detection;
final conclusions about possibility of wake visualization via water dimers emission/absorption;
schemes of possible variants of airborne and ground-based wake vortex avoidance systems and their characteristics.

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Aufforderung zur Vorschlagseinreichung

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Finanzierungsplan

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Koordinator

DaimlerChrysler Aerospace Airbus
EU-Beitrag
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Adresse
Hünefeldstra?e 1 - 5
28199 Bremen
Deutschland

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Beteiligte (6)

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1999-01815/de

European Union, 2024