Study of shock-wave flows in the channel by schlieren and background oriented schlieren methodsстатья

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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.

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[1] Study of shock-wave flows in the channel by schlieren and background oriented schlieren methods / F. N. Glazyrin, I. A. Znamenskaya, I. V. Mursenkova et al. // Optoelectronics, Instrumentation and Data Processing. — 2012. — Vol. 48, no. 3. — P. 303–310. The results of recording gas flow in a shock tube by the schlieren and background oriented schlieren (BOS) methods after initiating a pulsed (surface or volume) discharge are presented. Simultaneous recording of the flow field by the two methods allows a complete qualitative and quantitative analysis of the shock-wave processes resulting from the interaction of a pulse discharge with high-velocity flow. The vector displacement field of the BOS method was determined by the cross-correlation method.The density field was obtained by solving the Poisson equation with special boundary conditions. It was shown that the BOS method yields a good quality map of the flow structure that corresponds to the classical schlieren method and provides reliable quantitative results except in areas of high gradients. A modification of the BOS method was proposed and tested to measure the density jump at the shock-wave front. Recording was performed at an angle to the plane of the wave front. Various Schemes of processing of digital flow images were tested. The proposed method provides a resolution of large density gradients at the shock-wave front. The obtained quantitative results are consistent with the calculated values. [ DOI ]

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