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Active Control of Instabilities in Advanced Combustion Chambers

Objective



Objectives and content
To meet future legislative requirements for emission of
pollutants from aero and industrial and marine gas
turbines new combustion technologies will need to be
introduced. For aircraft engines and industrial gas
turbines (and also for boilers or power plants), one of
the most promising systems aimed at achieving minimal
emissions is the LP [Lean Premixed] system where the
combustion system is operated with very lean air/fuel
mixtures. Research on these types of systems for aero
and marine gas turbines is underway, whilst first
generation systems for industrial engines are currently
in production. EC programmes such as BRPR-95-0106, BRPR95-0109 or BRPR CT 950122 (LOW NOxIII) directly address
these issues and contribute to the knowledge gained to
date.
One key issue for LP systems is to ensure "combustion
stability" which is one of the main criteria contributing
to the acceptance of the combustion system. Combustion
instabilities, ie-undesirable oscillations of the whole
reacting flow are more often encountered in LP devices
than in classical systems. These instabilities are a
significant limiting factor in the development of LP
technologies and a high industrial risk in associated
research projects. The objective of ACIACOC is to limit
the risk to these systems by undertaking studies into the
basic causes of the instabilities and researching the
techniques to control them. ACIACOC is supported by the
EIMG [Engine Industry Management Group], which embraces
all the European companies producing aero gas turbines.
The project is of strategic importance to the European
industry and gathers the best academic and research
skills in Europe [IMF-Toulouse, EM2C-Paris, DLR-Cologne
and the universities of Karlsruhe and Cambridge] who will
combine to achieve the desired results guided by the
three industrial partners [Rolls-Royce, SNECMA and MTU].
The scientific objective is to study instabilities and to
develop active control techniques for these phenomena.
This challenging problem requires the development of
fundamental studies. The laboratories involved in
ACIACOC have been the pioneers of active control
techniques for combustion and they will bring the
required expertise as well as the corresponding patents.
The industrial partners will provide part of the hardware
necessary for research and an efficient guidance and
transfer of the research results because of the strong
and clear need of such techniques for practical
applications. The three-year programme will include
experimental studies of instabilities in gaseous and
liquid fuelled systems at both atmospheric and elevated
pressures, modelling of the phenomena, research into
actuators and sensors to control and monitor the systems,
and development of strategies for open and closed loop
control of the instabilities. Finally the project will
define the work required to enable the resulting
technologies to be commercialised.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

INSTITUT NATIONAL POLYTECHNIQUE DE TOULOUSE
Address
Allee Du Professeur Camille Soula, 4
31400 Toulouse
France

Participants (7)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Ecole Centrale Paris - Grande Voie Des Vignes
92295 Chatenay Malabry
GERMAN AEROSPACE CENTRE
Germany
Address
Linder Höhe
51147 Köln
MTU Motoren- und Turbinen-Union München GmbH
Germany
Address
665,Dachauer Strasse
80995 M«nchen
Rolls Royce - Industrial & Marine Gas Turbines
United Kingdom
Address
Ansty
CV7 9JR Coventry
SOCIETE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION
France
Address
Site De Villaroche, Rond Point Rene Ravaud - Reau
77550 Moissy Cramayel
University of Cambridge
United Kingdom
Address
Trumpington Street
CB2 1PZ Cambridge
Universität Karlsruhe (Technische Hochschule)
Germany
Address
5,Richard-wilstaetter-allee
76128 Karlsruhe