Session: 34-05 Flow Control

Paper Number: 82126

82126 - Experimental Flow Investigation Inside an Axial Compressor With Active Flow Control 

This contribution describes the experimental study of the flow physics inside the stage of an axial compressor equipped with an Active Flow Control system using Particle Image Velocimetry (PIV).

The test-bench, support of this work, is the low speed, single-stage axial compressor CME2 located at Arts et Métiers Institute of Technology in Lille (France).

The compressor is equipped with an Active Flow Control (AFC) system consisting of 40 actuators connected to an auxiliary supply pressure system, with the aim to extend the stable operating range and performance of the compressor. They are able to generate high speed jet blowing just at the tip of the rotor blades. An electromagnetic valve controls the opening of each injector. This allows to generate continuous or pulsed jet with frequency up to 200 Hz.

A specially designed transparent visualization window was installed on the side of the compressor above the stage and the laser light sheet enlightens three radial positions (at 18%, 51% and 79% of the blade height) in an inter-blade channel region. The PIV laser source is combined with an optical arm and an endoscope equipped with a converging lens to generate the laser light plane. The PIV image acquisition is synchronized with the rotor wheel at an effective system repetition rate of approximately 5 Hz. Thus, several snapshots are taken with the blades in the same position and the corresponding mean field is deduced. The Particle Image Velocimetry technique has been shown to be successful in providing high accuracy information on the velocity field of the flow inside the compressor.

The flow field analysis measured in the axial compressor will be investigated with and without the use of the active flow control system. The behavior of the compressor will be highlighted in particular at the operating points close to the stall in these two configurations.

Presenting Author: Pierric Joseph University of Lille

Presenting Author Biography: Born 20.08.1985 in Chartres (France), is currently Associate Professor at Arts et Métiers (Lille). He initially graduated from the ISAT Engineer School in 2008 (located in Nevers, France, and specialised in cars and transportation). He continued his studies on car aerodynamics and active flow control at the IAT (industrial wind tunnels complex located in Saint – Cyr – l’Ecole, France) where he earned his PhD in 2012. He was then involved in several research projects related to active flow control through several Post – Graduate positions in various locations (IAT, then PRISME Laboratory at Orléans, France) from 2012 to 2017, with also a position in the industry as a test laboratory manager in a SME specialised in impact tests in 2014 - 2015. He gets his current position in 2017 at Arts et Métiers (Lille) in order to reinforce the local team of the Lille Laboratory of Fluids Mechanics (LMFL), with the aim of applying active flow control technics to axial compressor.

Authors:

Joseph Moubogha Moubogha University of Lille
Pierric Joseph University of Lille
Olivier Roussette University of Lille
Antoine Dazin University of Lille