Vol 5, No 2-2 (2006): Special Issue

In the article the experiment al research of interaction of a drop wise plume of a liquid with heated granulouse fillings from pellets of the different sizes and bed depths is considered. The outcomes of experiments are represented by the way of relations of a mass share of a vaporized liquid to temperature of a high layer of a filling, width of a filling and sizes of pellets.

The possibilities of method of laser location implementation with use of changeable wavelength, pulse frequency and pulse duration were investigated. For the present method dependence of characteristics of surface reflecting against laser wavelength, pulse frequency and pulse duration at the surface light sounding were expose. The changeable wavelength and tunable pulse-periodic operation of operation are unique possibilities of laser systems.

In work various ways of matrixes application in business operation are analyzed. The relation (connection) between elements of two and more sets can be submitted in the matrix form. The composition of relations allows to simplify the analysis of connections between elements of sets. The example of us e of priorities matrixes in a control system of the enterprise is resulted.

The authors have developed the installation for investigation of initiation by laser radiation such high-speed processes, as combustion, explosive combustion, change the combustion in detonation and just detonation in condensed systems. The developed installation allows to explore at the same rate with temporary resolution the motion of front of sample under its irradiation by laser source and the scatter of products of decomposition. It is established that the increasing of wavelength of laser radiation increase the beam energy threshold required for explosive decomposition initiation in given systems.

During the engine tests the working processes control is conducted. Among others such control requires different pressure measurements. The most of the processes are accompanied by the working environment temperatures rise, which may be highly essential. Contemporary means of pressure measurements, which are used in automatic systems for the engine tests control are intended for work in temperature range up to 80ОС. Unlike known the suggested high temperature pressure sensor ensures precision of measurements at the expense of compensation of errors, which appear during pressures definition at high environment temperature. The sensor permits to widen of temperature range up to 400ОС. For that the additional measurements error doesn’t exceed 0,5%.

During contactless vibration measurements of disks, blades and other rotation construction elements of engine it is necessary to inspect of the operation gap between research object surface and the sensor with high precision (0.05 % – 0.1 %) in the conditions of such destabilizing factors influence, as strong electromagnetic and electrostatic fields, environment pollution, wear of construction elements of engine, high temperatures, feeding sources voltages variations, earch surface reflecting coefficient changes and so on. Moreover the influence factors are changing accident ally. In order to solve this problem the two-channel optic sensor with modulated emission for precision positioning was elaborated. In this sensor the positioning accuracy is achieved by subtraction of the photodiodes currents, research object surface is illuminated by modulated emission with the help of semiconductor laser, and laser pulses duration is chosen divisible to 1/50 Hz. The long-time positioning error (during a few hours) at the output of the device doesn't exceed 0,1 micrometer in the conditions of enumerated destabilizing factors influence.

The article describes the method of gas turbine engine control program optimization with accordance to efficiency parameters of aircraft.

For a number of designs lamellar vibration isolators the effective silicon organic liquids are selected with the high absorbing ability, released by domestic industry and optimum reliefs are chosen on surfaces of plates. The estimation of efficiency created vibration isolators is executed at bench dynamic tests - in a range of frequencies from 5 up to 500 Hz vibration isolators reduces the force transmitted on the case of the car from 4 up to 6 times.

The method of multi factorial planning of experiment is considered at res earch of dynamic processes and characteristics aviation engines during operational development and serial operation.

This work devoted to investigation of frontal device with 3-stage swirler for low-emission combustion chamber. The numerical model includes the Reynolds equations and Lagrangian individual droplet equations. Fuel distribution calculations were made for any real engine regimes. The results show large difference in vapour and liquid fuel phase concenration distributions.

It Is Shown that on all state of working engine energy to compressor is from turbine not only, but also from running up flow of the air. Product ?v ?to* remains such, either as at supply of the energy to compressor from turbine only. The Energy of the air for compressor increases on the same value, on which falls the energy running up flow. On constant frequency of the rotation турбокомпрессора ?to* grows that brings about reduction spare to stability of the functioning(working) the compressor

The schemes and the results of elaboration of the automated informative complex for test operation of aviation gas turbine engine are presented in this work. This automated complex is used for laboratory works in the process of education, as well as for realization of research activities. The work deals with HW (hardwarе) and SW (softwarе) of automated probation, with the help of which one can run the remote control experiments in real -time mode by means of information network, including Internet.

Results of the study of the acoustic features of the material MR are brought in work for different thicknesses, porosity and diameter of the wire. The curves of a sound absorption on one of the major parameters of a porous material to hydraulic diameter are generalized.

The expediency of use of effective hydraulic diameter, which considers both a mean of a size of pores, and distribution of pores on sizes, is proved at generalization of empirical data as a characteristic size of porous medium.

The organization of gas turbine engines data storage leans on information integration of processes during the through course computer project execution. Using hierarchical structure of design process, it is possible to create information object of the engine designing in the product data management (PDM) system environment – a «GTE data storage» database, in which the special classes, having there own set of attributes are created and used. The subordinate class inherits attributes from a higher class. Thus, in hierarchical structure of data the description information of GTE becomes fuller and specific.

It was investigated and optimized pulsejet`s performances. As compared with other flying analogues the engine is available flying up to 0,9…1,2 Mach number. The pulsejet could be used as propulsion system for high-speed unmanned aircraft, as space vehicle’s first-stage engine.

In the paper an interpretation of fatigue damaging the surface layers on friction are given. Results of working out a kinetic criteria of durability of surface layers is presented. Received criterion may be used for estimation of activation characteristics of destruction of materials, modeling the damageability and destruction of materials, and wear calculation.

In the article results of laboratory research of wear process of pair friction «bronze - steel» with the imposed normal vibration are described. The technique and the stand for wear tests at the imposed vibration are presented. Ways of an estimation of own frequency of a frictional joint are shown. Results of development of calculation model of kinetic type for an estimation of speed of wear process are resulted in view of influence of dynamic loadings.

The structurally functional circuit of formation of operational characteristics of details is submitted at laser processing by continuous radiation. Target parameters of such technological processes are depth of processing, the form of a zone of processing, property of the processed material, and also a roughness of a surface. Distinctive features of the offered approach from traditional are that the form of a laser stain and distribution of density of capacity of radiation are considered as key parameters of a mode of processing, the choice of parameters of a laser source and development of technological optical systems is carried out according to results of the decision of a return problem of heat conductivity. The developed technological method was applied at designing technology of increase of wear resistance of a cranked shaft of the piston engine.

The method of calculation of flow and pressure pulsations on the orifice plat e flowmeter’s input is presented. As an input data, pressure signals at the two points within flowmeter’s gas circuit are used. Obtained expressions are recommended for use in the digital correction of complementary error because of gas pressure pulsations.

The fallowing matters will be covered: load distribution between solids of revolution in a cylindrical roller bearing and contact taking into consideration: the actual geometric forms of the contacting solids; rigidity of the shaft and the body; admixture in the kubricant and reciprocal skewing of the races.

Results of research of frequency characteristics and forms of natural oscillations of flat polycrystal and monocrystal samples from heat resisting nickel alloy ЖС6Ф and monocrystal лопаток turbines from alloy ЖС32, having various azimuthal orientations presented at constant axial orientation.

Analyzed problem of hardness increasing in the welds of steel 08Al of the tailored welded blanks (TWB). Given the description of the steel 08Al, TWB sampling by laser and WIG welding, mechanical tests and metallographic analysis, definition of thermal cycle of metal in molten pool. Revealed the hardness increasing result from reversion of the steel structure and bainite phase initiations.

The approach to determination of plastic strains near tip of angular notch is considered by the example of problems of the uniaxi al a stretching of cylindrical and flat samples with angular notches. At calculation we propose, that the sample body is compound: the material is elastic-plastic as a whole, but we propose that the material is rigid-plastic in small area near critical point (the tip of the notch). This assumption allows realizing the numerical-analytical approach to determination of strain fields.

The problem of organizing a teamwork of experts, participating in the process of designing of an aircraft GTE is considered. The basic stages of an aviation GTE life cycle are resulted, components of a design stage and an modern PDM-systems' capabilities, allowing to raise general efficiency of process of designing are in detail analysed. It is shown, that designing of GTE in the PDM-system environment allows to reduce terms of design and technological preparation and execution of the project as a whole.

The model of structurally-parametrical optimization of the process of mechanical treatment of components during the stage of designing the technological process is proposed. As a main criterion, the summary expenditures of production are assumed. The salvation of a problem are determined values of guided parameters, depended on the determined initial conditions and static characteristics of casual parameters.

Mathematical model of a one-measuring motion of particles in combustion-gas stream of hypersonic stream generator (HSG) has been developed. Dependences of impulse and energetic characteristics of inoverexpanded two-phase from process parameters are received. Research influence of some parameters on the optimum of particles kinetic energy carried out.

The article sets forth the calculated research of influence of squinted form pressure side of outlet t railing edge of non-cooled vane section of axial turbine upon projection losses in vane row. The justification of the results received has been stated and recommendations on the choice of vanes trailing edge have been suggested.