An acoustically excited jet is a basic flow field that contains turbulent flow structures. A smoke machine seeds smoke into a large retaining box which allows the smoke to settle. A small fan forces the smoke out of this box and through the nozzle. The pulse burst laser system emits 532 nm pulse laser sheets that pass through the acoustically excited jet. The laser light scatters off of the smoke particles making the flow field visible. Sequential planar images of a plane of the flow field can be obtained using a high speed camera that is aligned perpendicular to the flow field.  A high-speed scanning mirror is also used to laterally scan the laser sheets the full depth of the acoustically excited jet. Stacks of planar images are obtained and because this occurs almost instantaneously, these images can be image processed and then stacked together to create a 3-D image of the flow field.                

                                                                                                                                      Acoustically Excited Jet Facility   

                                                                               Near-Field 3-D Image of Acoustically Excited Jet

Brian S. Thurow, Associate Professor, Thurow@auburn.edu

Department of Aerospace Engineering

211 Davis Hall , Auburn University, AL 36849-5338

Phone: (334) 844-6827      Fax: (334) 844-6803