В. А. Толпаев-организатор исследования. 2 К. С. Ахмедов систематизирует материалы исследования. 3 А. М. Кравцов систематизирует материалы исследования, оформляет статью. 4 М. Т. Петросянц формулирует выводы и обобщает итоги реализации коллективного исследования.
The paper discusses the results of the effective application of the method of spatial visualization of the flow around models in industrial ADT T - 128, combined with standard weight tests. Visualization of flow over the model was performed by varying humidity and temperature of the flow in test section. The results of a consistent standard weight experiment and a physical study of the characteristics of the flow around an aerodynamic model in an industrial ADT T - 128 are presented. In standard weight tests using video methods, the complex flow structure arising from the flow around an aerodynamic model at subsonic and transonic speeds is investigated. The results of balance measurements with simultaneous application of the method of spatial flow visualization around model in industrial T - 128 wind tunnel allowed to obtain physical information on the flow structure - a shock-waves, flow separation, wing vibration and deformation, the onset of asymmetric vortices. This greatly allows to expand the information content of experimental studies, to increase their reliability and to give a correct interpretation of the results obtained.
Development and implementation of water-saving technologies into irrigation agriculture aimed at increasing the efficiency of irrigation water use, is one of the priorities for achieving guaranteed and stable yields of agricultural crops. Study of parameters of artificial rain is one of the key moments in design of irrigation equipment. Research of the rain formation process is necessary in order to avoid negative effect on soil cover and vegetation, and also to increase efficiency of artificial irrigation, also reducing the power consumption. At the same time, one of the key characteristics is the diameter of drops created by rain-forming devices, which directly affects the other main characteristics of artificial rain and depends on the physical and mechanical properties of water, parameters of working fluid flow and geometric parameters of rain- forming devices. Based on the theoretical studies, a criterion similarity equation was obtained, allowing to calculate the drop diameter using parameters characterizing the process of artificial rain formation, to predict the size of drops when designing sprinkling equipment. The parameters having greatest effect on drop diameter are determined. It was revealed that, in accordance with the criterion equation obtained, the process of formation of artificial rain drops can be characterized by a geometric similarity criterion, as well as by Ohnezorge and Froude number. Calculations on the proposed formulas are well correlated with the results of other authors’ experiments. The studies conducted further allow to significantly improve the accuracy of determining the diameter of drops for various types of sprinkling nozzles, match design parameters and operating fluid flow parameters for the specified conditions.
We propose a method of solving problems of forced vibrations of prestressed plates based on the perturbation method and making it possible to solve problems for both low and high frequencies. We describe a method of determining the ground natural frequency.I Table. Bibliography: 5 titles.The first and third of the present authors [1], in solving problems on the flexural vibrations of circular plates by the perturbation method, took the perturbation to be the reduced frequencywhere p is the density, w is the frequency of the vibrations, and h, D, and R are respectively the thickness, the cylindrical stiffness, and the radius of the bar.In the present article, in the framework of the theory of flexible plates of small deflection, we study the stress-strain state of a rigidly clamped bar under the action of transverse vibrating forces. In doing this, taking account of [2], we introduce the perturbation e connected with f/2 by the equality i.e.,
В. А. Толпаев-организатор исследования. 2 М. А. Бондаренко-систематизирует материалы исследования. 3 В. В. Захаров-систематизирует материалы исследования. 4 А. М. Кравцов систематизирует материалы исследования, оформляет статью. 5 М. Т. Петросянц формулирует выводы и обобщает итоги реализации коллективного исследования.
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