20090038407 | METHOD OF GAS OR LIQUID FLOW VISUALIZATION ON AN OBJECT SURFACE - The invention relates to the field of experimental aero- and hydrodynamics, particularly to optical methods of studying a structure of a gas or liquid stream on object surfaces. The invention makes it possible to study several flow modes per a single preparation of an object. A surface to be studied is coated with a viscous liquid (VL) layer having optically foreign particles insoluble in the VL. Particles subjected to an outer stream move together with the VL. Two or more sequential images of a particle distribution on the object surface to be studied are recorded in a gas or liquid flow mode of interest. Particle motion parameters are determined by analyzing the recorded sequence of images. Reconstructing the pattern of the gas or liquid flow on the object surface. The object can be used for studying other flow-around mode without additional preparation due to sufficiency of a small displacement of particles for reconstruction of the flow pattern. To visualize surface flows on a movable object, an ensemble of markers rigidly bound with the object surface and optically distinguishable from the particles introduced into the VL are applied onto said surface, images of said marker ensemble are recorded simultaneously with recording particle distribution images, motion parameters of the object as a whole are determined by analyzing the recorded sequence of marker images, parameters of a particle motion within the viscous liquid layer are compensated by a motion of the object as a whole, and the gas or liquid flow pattern on the movable object surface is reconstructed from the obtained parameters of the compensated particle motion. | 02-12-2009 |