News Releases

December 2007

A first at the M1 combustion test bench in Palaiseau

A team of engineers and researchers broke new ground by carrying out advanced diagnostics simultaneously in order to characterize the operation of a low-pollution injection system under operating conditions.

As part of the European TLC ‘Towards Lean Combustion’ program, a team of engineers and researchers from DLR, CNRS and Onera observed the operation of a low-pollution multipoint injection system developed by Snecma. This initial campaign of innovative measures was carried out in November at the Onera center in Palaiseau and will be continued over the next few months.

The experiment required the use of multiple measuring techniques, including optical techniques, under very harsh conditions (pressure of 22 bars and temperature of 720 K at the air entry). The originality of this campaign, which has produced exemplary results, lies in the combination of these very high-end experimental techniques, provided by Onera and its partners (DLR and the CNRS laboratories Coria and Certam) with the quasi-industrial engine operating conditions afforded by the M1 combustion test bench from Onera.

 

Onera deployed one of its specialty items of equipment for visualizing combustion: PLIF [Planar Laser-Induced Fluorescence]. Thanks to this method, results for CH radical, a reliable flame marker, and vaporized kerosene in the chamber during operation could be obtained simultaneously. DLR was able to visualize the concentrations of soot in the flame using LII [Laser-Induced Incandescence]. These latter measurements were combined with soot measurements at the exit of the combustion area via ELPI [Electric Low-Pressure Impactor] with Onera Certam,  and SMPS [Scanning Mobility Particle Sizer] with Coria.

 

Last Update: December 17, 2007 - © ONERA 2009 - Terms of use