Multi-angular Flame Measurements and Analysis in a Supersonic Wind Tunnel Using Fiber-Based Endoscopes
Air Force Research Laboratory Dayton United States
Pagination or Media Count:
This paper reports new measurements and analysis made in the Research Cell 19 supersonic wind-tunnel facility housed at the Air Force Research Laboratory. The measurements include planar chemiluminescence from multiple angular positions obtained using fiber-based endoscopes FBEs and the accompanying velocity fields obtained using particle image velocimetry PIV. The measurements capture the flame dynamics from different angles e.g., the top and both sides simultaneously. The analysis of such data by proper orthogonal decomposition POD will also be reported. Nonintrusive and full-field imaging measurements provide a wealth of information for model validation and design optimization of propulsion systems. However, it is challenging to obtain such measurements due to various implementation difficulties such as optical access, thermal management, and equipment cost. This work therefore explores the application of the FBEs for nonintrusive imaging measurements in the supersonic propulsion systems.