AFDAR

Advanced Flow Diagnostics for Aeronautical Research

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 Obiettivo del progetto (Objective)

'The objective of AFDAR is to develop, assess and demonstrate new image-based experimental technologies for the analysis of aerodynamic systems and aerospace propulsion components. The main development focus is on new three-dimensional methods based on Particle Image Velocimetry (PIV) to measure the flow field around aircraft components, and on the high-speed version of the planar technique for the analysis in time-resolved regime of transient/unsteady aerodynamic problems. The progress beyond the state of the art with respect to current technologies is summarized by three aimed breakthroughs: 1) three-dimensional volumetric measurements over wings and airfoils; 2) time-resolved measurements and aerodynamic analysis several orders of magnitude faster than today; 3) turbulence characterization in aerodynamics wind-tunnels at resolution orders of magnitude higher than today by Long-Range Micro-PIV. The project ultimately aims to support the design of better aircraft and propulsion systems by enabling the designer to use experimental data during the development cycle of unprecedented completeness and quality. The work also covers the simultaneous application of PIV-based techniques and other methods to determine aeroacoustic noise emissions from airframe and to improve combustion processes to lower NOx, CO2 and soot emissions from engines.

The consortium is led by a Dutch Technical University and lists 10 partners including a Russian research Institute and an Australian University. Three industries are involved in this work either as participant or contributing under subcontract and providing testing facilities.

As final results of the project, a detailed analysis of the new measurement systems will be delivered and a number of demonstrations will be performed to validate the concepts in industrial environments. Special emphasis is given to the dissemination of results by meetings, publications and workshops.'

Introduzione (Teaser)

An EU-funded project developed and demonstrated new image-based experimental technologies for analysing aerodynamic systems and aerospace propulsion components.

Descrizione progetto (Article)

In its Vision 2020, the Advisory Council for Aviation Research and Innovation in Europe (ACARE) has set ambitious targets for reducing emissions and the perceived noise level. Such targets dictate the need for significant improvements in the aerodynamics and propulsion system design of aircraft. These in turn require advanced verification tools for flow phenomena that involve complex processes such as combustion and aeroacoustics.

Scientists initiated the EU-funded project 'Advanced flow diagnostics for aeronautical research' (http://afdar.eu/ (AFDAR)) to develop and assess flow diagnostic tools for advancing the aerospace industry. AFDAR greatly contributed to the development of image-based, non-intrusive measurement techniques for future aircraft development and wind tunnel characterisation.

In particular, the project team focused on particle image velocimetry (PIV) to measure the flow field around aircraft wings and gain a deeper understanding of challenges in aerodynamics. It worked to achieve 3D volumetric measurements over wings and aerofoils, in addition to obtaining precise measurements and aerodynamic analyses much more rapidly with kilohertz measurement systems. The project team also worked at deeper understanding of turbulence physics in aerodynamics at radically higher resolution (orders of magnitude) using long-range micro-PIV.

In addition to improving the design of aircraft and propulsion systems, the new technologies helped determine noise emissions and optimise combustion processes for lower carbon emissions.

Scientists performed high-resolution analyses of swept aerofoil flows undergoing laminar separation and transition, transonic turbine cascades and ultra-low nitrogen oxide emission combustors. It also advanced flow diagnostics for the aerodynamic and aeroacoustics of wings with high-lift devices. The experiments executed on high-lift flows around a three-element aerofoil configuration should serve as reference in improving computational fluid dynamic simulations for high-lift systems.

The experimental approaches demonstrated in AFDAR combined flow analysis and thermal and chemical species mapping that are fundamental to understanding and optimising the combustion process. The combination of advanced PIV techniques for the wing and turbomachine aeroacoustic analyses delivered useful experimental databases. These should help designers to improve on efficiency and reduce the aerodynamic noise sources.

Project work should help pioneer future air transport technology, bringing a variety of benefits such as faster, safer, greener and possibly less costly aircraft.