Том 52, № 7-8 (2016)

A computational procedure and technique for computing the strength and tension of a bayonet catch (represented as a thin short cylindrical shell, with a ring on one edge of the shell and teeth along the other edge) loaded on the side of the teeth with a regular load are proposed. It is shown that with this type of loading, the stresses and displacements differ significantly from the computed values obtained in axisymmetric loading.

Constraints on the degree of specification and the statement of models of limits on the vectors of state variables of an oil recovery and intrastratal disturbance process control system are given. The structures of the models are found through a solution of the dual problems of the classical theories of filtration and underground hydrodynamics. The limits on the constraints placed on the vectors of the input and output variables of the control systems are the result of an improvement in the dynamic models of the determination of drill hole dip and direction of existing wells.

The problems arising during the use of ribbed pipes at the Angarsk Petrochemical Complex and the process of formation of deposits and their effect on the technology of products manufacture are studied.

The problems of designing and employing cryogenic systems operating in transient modes over a considerable operating time as well as various methods of simulating transient operation of these systems are discussed. The advantages of application of dynamic simulation of cryogenic systems over classical methods of calculation of steady-state mode are shown. The available information on dynamic simulation of large helium cryogenic systems is reviewed. To validate the dynamic simulation method, the transient mode of operation of a large helium liquefier is analyzed applying universal software tool for dynamic simulation modeling of chemical systems, the results of which are compared with the experimental data.

Gas dynamic efficiency of short diffusers in life support system filters is analyzed. Relevance of using such diffusers is discussed, as well as ways to increase their efficiency by decreasing gas dynamic losses while complying with velocity criteria. A method of calculating the flow channel of the short diffuser is developed and verified, and unique conditions for the calculation are stated. Calculation results for various short diffuser designs are presented, and the correlation between the designs and the efficiency of short diffusers is analyzed.

Results are provided for a study of the effect of thermal cycling treatment on the structure and properties of ferritic-austenitic steel welded heat-affected zone metal. Optimum thermal cycling regimes are determined. It is shown that an increase in heat-affected zone impact strength with thermal cycling is due to fragmentation of structural components, redistribution of alloying elements between phases, and excess phase amount and morphology.

The results of an experimental study of liquid dispersion by a centrifugal atomizer under large drops formation conditions are presented. The physicochemical properties of the liquid and the geometric parameters of the atomizer are shown to exert influence on the composition of the dispersing spray.

The working process in a double-acting piston pump in which the valves have been replaced by fluidic diodes is investigated. A computational model of the process, constructed on the basis of a representation of a complex stream by a sum of two simple streams, the first caused by the harmonic movement of the piston and the second due to the head difference between the dampers, is proposed. Analytic expressions of the flow–head characteristics and the pump efficiency are obtained. It is shown that, unlike a piston pump with valve distribution, the flow–head characteristic of a pump with fluidic diodes is descending and flattened. In the region of low heads, its delivery may exceed the delivery of a pump with valves. There is an interval of heads on the characteristic in which the efficiency of the pump is maximal.

The effect of zinc powder granulation on coating formation during dynamic thermal diffusion galvanizing is considered. The role of specific surface and powder faction composition in chemical and physical processes governing diffusion coating formation rate and quality is noted.

The behavior of charged particles in a curved electrostatic-cyclone channel model is described. The model is built using a finite-element method. The electric field is calculated for a corona discharge electrode voltage of 15 kV. The flow field is calculated for gas velocities of 1, 3, and 5 m/sec. Trajectories for particle sizes of 1, 10, 50, and 100 μm are obtained. Re-entrainment is demonstrated to exist within the annular channel.

A method is proposed for preparing high-strength cast iron with spheroidal graphite by introducing calcium oxide and other calcium-containing ingredients into the composition of flux cored wire. It is shown that introduction of carbon, silicon, and calcium facilitates the formation in a surfacing layer of a ferrite-pearlite structure and spheroidal graphite. Theoretical bases are provided for the surfacing metal composition.

The need for preliminary abrasive cleaning of gas pipelines to increase the efficiency of in-pipe diagnostics by magnetic longitudinal magnetization flaw detectors is evaluated. The method of abrasive cleaning of pipes and a tool that implements the method is presented. Results from pilot tests under conditions typical of Saratovorgdiagnostika company are presented.

Explosive pressing is presented as a promising polymer processing procedure. The effects of varying the static-pressing and explosive-pressing intensities on the thermal characteristics of polyacrylate, phenylone, and composites based on F-4 were compared. The formability of the materials during heat treatment after pressing and subsequent sintering is estimated. The stress and composite composition giving the most heat resistant material are determined.

A continuous-acting whipstock with hydromechanical working body by means of which the deviation from a set route may be substantially reduced in the process of drilling wells is developed.