METHOD OF VISUALIZATION OF THE FLOW LIMITING LINES AND THE DISTRIBUTION OF THE FRICTION STRESS ON THE SURFACE OF THE OBJECT IN THE GAS MEDIUM OR THE LIQUID MEDIUM Russian patent published in 2007 - IPC G01P5/20 G01M9/06 

FIELD: aircraft industry; shipbuilding industry; methods of visualization of the limiting lines of the flow and of the distribution of the friction stress on the surfaces of the object in the gas or the liquid mediums.

SUBSTANCE: the invention is pertaining to the field of the experimental aerodynamics and hydrodynamics, in particular, to the optical methods of research of the flow structure of the flow of the gas or liquid medium on the surfaces of the objects and may be used for visualization of the flow of the gas or the liquid on the surfaces of the moving objects. The researched surface of the object is coated with the layer of the viscous liquid (VL), which contains the optically foreign solid particles unsolvable in the VL. Under action of the exterior flow the particles are moving together with the viscous liquid. At the gas or liquid flow mode of our interest they register two or more sequential images of allocation of the solid particles on the researched surface of the object. On the results of the analysis of the registered sequence of the images determine the vectors of the displacement of the particles and recover the limiting lines of the flow of the gas or the liquid on the surface of the object. At that they additionally determine the allocation of the VL layer depth on the surface of the object and by normalizing the value of relocation of the particles with respect to the depth of the VL layer determine distribution of the friction stress on the surface of the object. Distribution of the VL layer depth may be determined by counting of the surface density of the particles. If the number of the particles is very small or, on the contrary, it is too big then for determination of the VL layer depth distribution select the luminescence VL, illuminate the surface by the exciting radiation with the known intensity, for example, equal for all points of the researched surface, and register the VL luminescence, which is proportional to the VL layer depth. The technical result of the invention consists in provision of the possibility to obtain the distribution of the friction stress on the surface of the object and in the increased information value of the obtained data at realization of the process of the visualization.

EFFECT: the invention ensures provision of the possibility to obtain the distribution of the friction stress on the surface of the object, the increased information value of the data received at realization of the visualization process.

5 cl, 3 dwg