Pseudo-schlieren CT measurement of three-dimensional flow phenomena on shock waves and vortices discharged from open ends |
| |
Authors: | K Maeno T Kaneta T Morioka H Honma |
| |
Institution: | (1) Faculty of Engineering, Chiba University, Chiba 263-8522, Japan;(2) Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan;(3) Present address: Olympus Co., Ltd., Japan;(4) Present address: National Metrology Institute of Japan, AIST Tsukuba 305-8563, Japan |
| |
Abstract: | 1A pseudo-schlieren technique is applied to the interferometric computed tomography (CT) measurement of three-dimensional
(3-D) shock waves discharged from a square open end and a pair of circular open ends in a shock tube experiment. The experiment
is performed for incident shock Mach numbers of 2.0 and 2.2 in nitrogen gas under supersonic post shock flow conditions at
the open end. The 3-D density-gradient distributions are evaluated from the CT data of the 3-D density distributions, and
are depicted in gray-scale CT images of the gradient magnitude and in pseudo-color CT images of the gradient component. The
resultant pseudo-schlieren CT images clearly illustrate the 3-D flow features of shock waves, contact surfaces, and the other
sharp density fronts. Their image characteristics and meaning in gas dynamics are discussed in comparison with the pseudo-color
images of the density. We demonstrate that the pseudo-schlieren CT technique is a useful tool for studying 3-D problems in
shock dynamics.
Communicated by K. Takayama
PACS 47.32.cd; 47.40.Nm; 47.80.jk |
| |
Keywords: | Computed tomography Interferometry Pseudo-schlieren technique Shock wave diffraction Supersonic jet Three-dimensional flow |
本文献已被 SpringerLink 等数据库收录! |
|