Author : Fritz Hermann Ernst Oertel
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Book Synopsis Laser Interferometry of Unsteady, Underexpaned Jets by : Fritz Hermann Ernst Oertel
Download or read book Laser Interferometry of Unsteady, Underexpaned Jets written by Fritz Hermann Ernst Oertel and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes an experiment to obtain optical data for an unsteady, under-expanded axisymmetric jet issuing from a one inch diameter tube at supersonic velocity. A technique is described which has been found useful to obtain sequence photographic data for such transient processes. In this technique, a bleachable absorber is used to generate multiple laser pulses so that instantaneous images of the laser-illuminated event are swept onto a fixed film drum with a mirror rotating at approximately 16.2 mm/microsecond. (Comments on our experience with high voltage double-pulsing a Pockels cell are also included). Sequence (multiple frame) laser interferograms made by backlighting aMach-Zehnder optical interferometer used to observe the flow are shown and discussed. Single frame spark shadow photographs which give qualitative support to the interferograms are also shown. (Author).