Vol 18, No 3 (2017)

The paper presents the results of designing a turbine profile type A3K7 NACA using CAD, which realizes the method of nonlinear transformation. Girst transformation was used by the authors. All calculations and graphical representations were made in the computer algebra system Mathcad. For the calculation and graphical representations the middle line, defined by coordinates, is approximated with two linear segments in the regions of the leading and tailing edges with specified angles and three nonlinear segments in the form of second order Bezier curves. The coordinates of the matching points of neighbor sections are calculated using an iterative method with an optimization of the correlation index. The coordinate of the bending point was found using the condition of equality to zero of the second derivative of the interpolative contour. The coordinates of the junction point of the leading edge are determined in the paper as ab arc and a series of points of the contour, approximated by a second order Bezier curve. After determining the first and last point of the second order Bezier curve, the coordinated of the middle point on the intersection of tangential lines that start at the first and last point of the curve. After the approximation of three sections with second order Bezier curves the integral function of the blade back (convex side of the contour) of the profile A3K7 considering the leading and tailing edges are made as arcs.

The results of design, fabrication, experimental testing and introduction of technological processes of manufacture of pipelines complex shapes from polymeric film materials, which was used when creating a cryogenic upper stage “12КРБ» is presented.

There examined method theoretical research of sectional piston skirt hydrodynamic lubrication, and influence of piston and connection rod groups options on it.

The article presents new data on mineralogy of the ores of U-Mo-Re Briketno-Zheltukhinskoe Deposit hosted in terrigenous rocks. Sulfides, mainly presented by pyrite, have been studied. Previously unknown mineral forms, such as Se-pyrite, iron selenide - dzharkenite and chalcopyrite, have been found.

Dynamic properties of ADC time-impulse type with a coarse-fine reference system are analyzed. The concept of the acceleration coefficient of the transformation process is introduced, and its dependence on the number of discharges and the number of conversion steps is investigated. Recommendations for the choice of the parameters of the transducers are given. A technique is proposed for the optimal distribution of discharges over the conversion stages, which ensures the best dynamic properties of coarse-accurate converters. It is shown that the implementation of coarse-precision methods provides multiple acceleration of the conversion. The fastest rate increase observed in the transition from a single-stage to a two-step transformation.

Analyzed experimental and field studies of flotation processes in the construction of mines-tanks for backup of hydrocarbons by the method of underground dissolution of rock salt with a high content of gas.