Study of the structure of underexpanded turbulent supersonic jets by the laser transillumination method
D.A. MARAKASOV, A.A. SUKHAREV, A.Sh. TSVYK
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: supersonic jet, laser transillumination, wavefront distortion, air density, retrieval
Abstract
The spatial distribution of the average air density in a supersonic jet is analyzed based on the results of laser transillumination. The algorithm for retrieving the average density from deviations of the translucent wave front transverse with respect to the jet axis was tested in experiments at the Vertical Jet Setup of ITAM SB RAS. The retrieval results are compared with the data of contact measurements known from the literature and with the results of numerical simulation. A good sensitivity of local wavefront slopes to fluctuations in air density at frequencies of discrete acoustic tones is show, which opens up possibilities for experimental study of their spatial structure inside the jet channel.
|
