‘Synthetic schlieren’’, which has been used to measure the amplitude of two-dimensional internal wave beams generated from an oscillating cylinder, is adapted to analyze axisymmetric internal waves generated by an oscillating sphere. This nonintrusive technique uses elementary inverse tomographic methods to measure the amplitude of the conical-structured wave beams everywhere in space and time....

To investigate the dynamic behavior and flame acceleration of spherically expanding hydrogen flames under low-pressure conditions, deflagration experiments were conducted in a closed combustion chamber. The was observed by high-speed Schlieren imaging, radius propagation velocity measured analyzing photography. When sufficiently small, smooth surface observed, where stretching affected strongly...

Deformable components such as sandwich structures possess promising properties for use in protection systems. Detailed studies on energy absorption and fluid–structure interaction effects are necessary the application of deformable blast resistant design. In this paper, an existing shock tube facility has been extended with a transparent section to observe measure fluid flow structural response...

A wavelet-based optical flow analysis (wOFA) method for processing background-oriented schlieren (BOS) images is presented and demonstrated on synthetic experimental data. Optical inherently well suited to BOS, because the background pattern lighting conditions are specified controlled by user can be chosen play strengths of processing. Analysis BOS data show that a two-dimensional sinusoidal p...

Background-oriented schlieren (BOS) is an optical visualization technique that reconstructs a whole-field flow based on its density gradient. Thanks to the cost-effectiveness of setup and unlimited field view, BOS has become attractive for laboratory large-scale experiments. In BOS, reconstruction refractive index involves various mathematical calculations, which depend geometry. this context, ...