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The results of an experimental study of a pair of interacting vortices at Mach number of 3 are presented. Laser sheet visualization were performed at various longitudinal coordinate values. The mutual influence of the fact of interaction on the vortex cores size is shown in comparison with the case of an isolated vortex. The results obtained compared to the results of numerical simulation. [ABSTRACT FROM AUTHOR]

The production of monodisperse inorganic nanoparticles attracts the attention of researchers around the world due to their potential importance in practical applications in the field of optical devices, catalysts, drug delivery, fillers for polymers, etc. One such material is silicon dioxide, which serves as the basis for a huge number of nanocomposites. In this regard, the aim of this work is to study the effect of the type of dispersion medium on the synthesis of nanosized SiO2. The paper presents the results of an investigation of the influence of the type of solvent on the morphology, the structure and size of silicon dioxide particles synthesized by sol-gel method. It was found that the type of solvent significantly affects the shape, size of the particles, their aggregation and stability. The particles of SiO2 synthesized by the Stober method are monodisperse and X-ray amorphous regardless of the type of solvent and contain a significant amount of adsorbed molecules of alcohols and water. [ABSTRACT FROM AUTHOR]

The results of experimental study of the flow in the wing wake at Mach number range M = 2 - 4 and angle of attack of 10 degrees are presented. Experiments were carried out in supersonic wind tunnel T325 of ITAM SB RAS. Rectangular half-wing with sharp edges was used to generate vortex wake. Constant temperature hot-wire anemometer was used to measure mass flow and its pulsations. The hot-wire data were compared with 5-hole pressure probe data. [ABSTRACT FROM AUTHOR]

We present a method for and results of determination of the field of integral density in the structure of flow corresponding to the Mach interaction of shock waves at Mach number M = 3. The optical diagnostics of flow was performed using an interference technique based on self-adjusting Zernike filters (SA-AVT method). Numerical simulations were carried out using the CFS3D program package for solving the Euler and Navier-Stokes equations. Quantitative data on the distribution of integral density on the path of probing radiation in one direction of 3D flow transillumination in the region of Mach interaction of shock waves were obtained for the first time. [ABSTRACT FROM AUTHOR]