Fig 1 (IMAGE) University of Bristol Caption Boundary layer ingesting (BLI) ducted fan test rig inside the aeroacoustics wind tunnel facility at the University of Bristol. Credit Feroz Ahmed Usage Restrictions once with release License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.