Vol 11, No 3-3 (2012): Special Issue

The article describes the experience of service systems socket gas dynamic seals are described designed experimental equipment and method of equivalent tests, as well as the main approaches to the creation of their diagnosis.

The work devoted to numerical investigation of characteristics variation of the compressor, changes of its stability margin and air flow when working in the engine system by increasing the radial (tip) clearance. The study was con-ducted using the method of calculating the three-dimensional flow of air in the compressor, which is implemented in a software product NUMECA Fine / Turbo.

The possibilities of optimizing the level of roug Samara State Aerospace Universityhness profile surfaces means CNC lathe. Using a diamond cutter, especially machine design and software provided by the CNC system, the technological process, which is close to the technical nature of nursing, which can significantly reduce the level of roughness of the curved surface. The reduced level of roughness occurs at any fragment contoured surface. Software, the influence of transverse and longitudinal play ball - screw propellers, and get micro rough surface with a flat top, which favorably affect the performance properties, such as diffractive optical elements.

Residual stresses in flat specimens made of ЭИ698 alloy after ultrasonic hardening under different regimes have been studied. Optimal regimes of ultrasonic hardening have been determined on ground of average integral residual stresses criterion.

Preliminary study of heat recovery and intermediate cooling of working medium effect over the turboshaft engine effective efficiency is carried out.

Computer-aided system of gas turbine engine calculation and analysis (ASTRA) developed at the Aircraft Engine Theory department of Samara State Aerospace University is described. Its functional capabilities and development of gas turbine engine simulators for various initial-stage design tasks are described.

The article describes the choice of working process parameters of three-shaft bypass engine. Possibility of creating a set of engines varying in the thrust level on the basis of the selected gas generator is studied. Efficiency of the unified gas generator as a subsystem of ground-based powerplant is examined.

In this work compared the accuracy of three-dimensional and two-dimensional modeling of the echo in the ANSYS program for the example of rounding edges of the union.

There are different approaches of parametric 3D modeling gears with internal and external relief in the article, and also algorithm successive construction of bodies of revolution, formation of the ring gear with involute tooth profile and involute splines among Siemens NX with using MS Excel and VBA macros.

In this paper considers issues of improving the efficiency of the catalytic converter. Designed a new design of the catalytic unit. Completed the full range of hydrodynamic calculations of micro eddy currents in the channels of the catalyst.

In this article we propose to use virtual model of manufacturing to reduce all production expenses by using the digital models both the products and all means of production, manufacturing and logistics processes. It allows the production manager to access information about the product and planning production with optimization of all the resources and the processes, integrating data with suppliers at the earliest stage of design.

Problems of practical training fulfillment for course of studies “Design of Main Unit and Systems of Rocket Engines” by students are discussed.

The issues compiling hardened part endurance limit increment prediction after making a semicircular profile cut are discussed in this paper. Estimation of coefficient of residual stresses influence on solid and hollow cylindrical parts endurance limit is given.

The results of the residual strained state components distribution along the smallest section of superficial hardened hollow cylindrical part are given. The dependence of axial residual stresses in the smallest section on concentrator geometric parameters have been examined.

The fact, that the part with a concentrator endurance limit under outstripping superficial plastic deforming depends on the hardened surface layer with compressive residual stresses thickness has been established.

Thermoacoustic generator, consisting of a thermoacoustic travelling-wave engine and linear alternator 1S102MA with electrical load of 80 Om, is being considered. Under considerations of maximum electric power and different pressure amplitudes the frequency of operating point was determined by electroacoustic analogy approach. The calculation results were compared with the results of calculation in program code DeltaE.

In the paper, based on the example of development and improvement of the conditioned clothing, is examined the possibility of designing of this local zone in the productions, with the high temperature.

Method of numerical-analytical determination of centripetal ultralow power (CULPT) turbines volume and mass at the initial stage of the design are shown. The developed mathematical model of mass can be used to solve the problem of multicriteria optimization of CULPT parameters, which includes optimization of ultralow power turbodrives mass characteristics.

The results on studies of the possibility of applying the technology of micro-arc oxidation as the repair and replacement technology for aluminum alloys are presented. The possibility of using technology MAO to repair and restore the geometry of the working surfaces of parts made of aluminum-silicon alloys operating at high temperatures and significant thermal deformations was displayed.

In the article calculation researches of vibrations of pipelines of aviation engine are resulted in the environment of ANSYS and experimental researches by the noncontact system of ARAMIS.

In the article the sequence of leakage definition through radial face seal in a support of the compressor for takeoff and cruiser modes is resulted. Certain computational values of leakage (2,4 g/s on a take-off mode and 0,75 g/s on cruiser mode) coincide with available experience of seal designing.

This paper presents an algorithm for forming model technology processes in the control system of radial clearance in the turbine of gas turbine engine with non-stationary work conditions. Based on the model of NK-361, radial clearances were calculated in the low pressure turbine throughout the work cycle of the engine, the geometric parameters of the thermal control system of radial clearance were investigated and the gaps by air cooling of stator were calculated.

Three main approaches to parametric models of blade machines formation are described. In fractional outlines the advantages and disadvantages of each approach. Particular attention is given to the importance of parametric models creating when turbomachines are being designed and refined.

The results of formation of structure assortment of commercially pure titanium as a function of the coarsegrained or nanostructured status for providing the mechanical properties obtained a variety of ways details of assemblies are presented. The structure of titanium, depending on the circumstances and the nature of hydrogen absorption during machining is investigated. The impact of particular modes of heating and deformation processing workpieces on texture formation and the fluctuations of the mechanical properties of metal on its area and thickness are established.