STAR: an efficient micro-jet simulator for active control in CEPRA19. Some applications

Abstract

The need to evaluate news methods of jet noise reduction, amongst them shear layers active control with continuous or pulsed microjet concepts led the Onera Wind Tunnel Division to develop in the large anechoic facility CEPRA19 the necessary hardware to enable such concepts to be brought into operation. This system enables microjet concepts to be tested on a large scale (typically 1:10) nozzle model on which most kind of nozzle operating points can be generated with external flow simulation. With such an efficient system called STAR, the evaluation of the efficiency of microjets to mitigate jet noise becomes very useful at large scale to increase the TRL. The nozzle can be tested either isolated or in so-called installed configuration. In this case, a typical underwing engine mounting can be rigged, featuring the wing itself and a pylon. The design of the STAR started in 2009, in the frame of the French research programme REBECCA. The first test using this took place in 2011, and its last use, this time in its final form, took place in 2013, for the REBECCA test campaign, and also for the OPENAIR one. A test campaign under French-Japanese collaboration has been also carried out. [...]