Vol 8, No 3-2 (2009): Special Issue

Work has described in theses is dedicated to problem of creating finite-element models of high-quality for gasdynamic research. Is offered model composed like a combination of separated parts-modules connected together in preprocessor Ansys CFX-Pre. Model has opportunity to include modules created in purely arbitrary 3D-modeling and meshing systems. Even so it keeps correctness what was shown by test-computing. Model processes flexibility and versatility and can be applied for analysis of turbomachines and similar-topology devices.

The stiffness stress state in the interlock blade-disk of the type “fir tree” in the condition of crack birth is examined here. The changing of the stiffness of a stress state is considered in depending on the basic interlock angels. The approach for the interlock optimization provides the increase of the fracture strength.

New approaches to estimation of a roughness of rollers’ surfaces after finishing processing are offered in the article. During research two methods were compared. The first method is traditional – researching the profile of the surfaces. The second is based on application of optical-electronic means and computer technologies. Results of comparison of a roughness of a surface after grindings by abrasive circles are presented.

The energetic method for determination of the efficient parameters of strengthening has been developed on the basis of the analysis of the residual stress of parts as well as on the initial stress conception. This method provides the increase of the endurance strength and the relationship of parts within the limits of technological tolerance. The realization of the method is described on the example of shot peening strengthening.

Process of formation of ice on walls of cryogenic tanks of carrier rockets is observed, theoretical calculation of weight of ice formed of the rain water which has got on a cold wall of a tank is carried out, experimental researches of process of formation of ice, and also protection methods cryogenic surfaces from ice formation are spent.

Foreign object damage is a significant cause of failure in gas turbine engines. The paper describes a methodology for probabilistic estimation of real compressor blades durability to foreign object damage. The methodology is based on numerical and experimental modeling of blade damage, experimental and computational procedure for assessment the fatigue strength loss of the damaged blades using minimum fatigue tests, failure probability calculation. The methodology may be used for evaluation the efficiency of durability rising procedures.

The opportunity of increase in work and increase of effective efficiency of complex cycles is considered on the way increase in a degree of increase of pressure up to optimum on effective efficiency for a simple cycle under condition of ensuring of equality of effective efficiencies simple and complex cycles as criterion of efficiency of the last.

This article describes the actual experience with the integrated CAD/CAM system for the development of control programs for the multi-channel CNC machining. Author describes the methods of channel synchronization during the simultaneous milling-lathing machining. Aspects of postprocessor development are shown on the example of threechannel machine tool.

Using the scheme of radiant heat transfer between the unbounded plane and rows of tubes in parallel planes, considered heat transfer inkjet linen cloths coolant moving in the longitudinal direction of die refrigerator drip emitters and ending in space. A design scheme of temperature changes during cooling jet linen cloths in space. We calculated the formula for determining the current and the average temperature along the length of linen cloths, as well as the length of linen cloths depending on the heat load from the Erase spacecraft. Using the proposed simple model of heat transfer inkjet linen cloths refrigerator drip emitters and space led to the practical coincidence of our calculations the number of drop of heat into outer space droplets refrigerator and the average temperature along the length of the jet with the results obtained using a complex model of heat transfer drop linen cloths Konyukhov G.V.

The basic toxic components of the fulfilled gases of engines are nitrogen oxide. One of the most perspective methods of decrease in toxicity of diesel engines is the method not catalytic reaction restoration NOx by ammonia. The design procedure of the constructive sizes of neutralizer taking into account features of diesel engines is developed.

Issues of choosing supports for modernizing free power turbines, calculations and optimization of working characteristics of slide bearings are analyzed. The differential equations of rotor motion regarding its design features are presented. The results of the calculations of forced oscillations upon the system are shown and an analysis of the feasibility of improving the support of a free power turbine is given.

This work devoted to investigation of frontal swirl device for low-emission combustion chamber. It deals with the mixing processes of liquid droplet fuel and air flows. The numerical model includes the Reynolds equations and Lagrangian individual droplet equations. Fuel distribution calculations for any constructions of swirler were made. The results show the agreement coincident of experimental and calculation results.

The method of billets production by casting has been introduced. It allows controlling the composition and the structure of the billets’ material at the expense of variations of chemical structure, temperature regimes, as well as artificial mechanical and other impacts on the flux during crystallization processes. The interdependence between the produced structure and mechanical properties of the material has been researched.

In this article considered computation of thermal condition of new LRE with cooling by liquid oxygen. Substantiation of LRE cooling channel design is considered, analysis of various procedures of computation convection heat flux and heat transfer coefficient is performed. As the result distribution of chamber wall temperature (hot gas side) and coolant pressure is presented. Recommendations on lowering wall temperature and it measuring during fire tests is proposed.

The dynamic analysis of internal-combustion engine in MSC.ADAMS environment requires calculation of piston applied gas pressure forces versus piston motion ratio. The analysis of indicator diagram is performed with KDAM code application depending upon piston diameter, compression ratio, pressure gain, advance angle. The dynamic analyses have been performed for in-line, V-type and opposed internal-combustion engines.

Algorythm of exponential smoothening of a time row having an arbitrary trend. This algorythm can be used at automated control of a technical process in real time conditions.

Basic design of aircraft is characterized by uncertainty of GTE; multicriterion - uncertainty of purpose; uncertainty (predictive of) the source of design data and other project solutions in these circumstances can be to find areas of compromise. Given these characteristics of the area received good values for workflow small helicopter GTE.

Design calculation method of duplex centrifugal emulsion spray burner for arbitrary construction scheme is created. Expression for lumped geometric characteristic of emulsion spray burner which takes into consideration influence of viscous emulsion is received. It allows calculate all required parameters of designing emulsion spray burner with required in practice precision.

Is indicated that working substance in combustion chamber corresponds a variable-mass and variable-composition body. Its variation is described with calculation equations for variable-mass and variable-composition body thermodynamics. System of equations for calculation combustion products equilibrium composition is composed. Mathematical model of small-thrust rocket engine which allows to determine ideal engines parameters for pulse mode is designed.

Main and fatigue crack front in homogeneity under high cycle loading was considered. It was considered in the view of wave deformation process in metals. Represented rules on the basis of plane longitudinal section hypothesis allow using wave equations for crack structure description. This method of crack front differential analysis is the basis of cyclic strength wave theory.

Principles of modeling of structure of MR material and heat conduction process for absence of convection of media in holes are presented in this article.

Physical-mechanical properties of chromium coatings, deposited from oxalic-sulphatic solution containing nanoparticles Al2O3 & ZrO2, are investigated. Results of accelerated corrosion test in the salt spray chamber by the cluster “trivalent” coatings with additional processing are represented. Structure & morphology of Cr(III)-coatings, deposited from solution containing nanoparticles Al2O3, are fixed by the methods of X-ray photoelectron & Auger electron spectroscopies (XPS & AES).

The method of the flowing reactor for experimental issledo-vanija processes of transformation self-igniting liquid rocket fuel is offered and approved. The given method allows to investigate initial stages of processes of transformation of fuel and a fashion-lirovat influence on them of various boundary conditions, first of all influences is effectivesti mixtures in a liquid phase of components.

The article is devoted to basing error research in blade fixturing mechanism setup of POMKL-BLIK device. The research is divided on two extended phases. The first experimental phase is carrying out to determine dispersion field by measuring etalon spatial locations with coordinate measuring machine. The processing of data obtained while experiment was executed on the second phase. The problem is in double-dimensional data spreading. Therefore the method of double-dimensional probability densities approximation was given in the article. The result of the experiment would be analytical expression of double-dimensional statistical law that describes random field of experimental points and probability fiducial intervals in double-dimensional space.

In article necessity of creation of air-rocket engine for perspective flying machines is shown and application in it of the chamber of combustion is proved. The current review of pulsing chambers wich are probably to apply in the space technics, the models is designed and tested by authors. The scheme of the combined engine with the direct-flow chamber of pulsing and a perpendicular supply of gas stream is developed. Fire tests of bench model of a power-plant are conducted and basic taktiko-technical characteristics are received.

In this paper, executed with participation of doctor of engineerings sciences, professor of Biryuka Vladimir Vasil'evicha, there are experimental research data of wet condition in fuel tanks of high weight booster rockets for providing corrosion protection during storage and aviation transportation periods.

The paper conducts comparison of gas torrent patterns in interblade channels of a turbine stage. Received in calculation by means of CFX program with the existent physical conceptions and experimental data. The calculated torrent structure matches well the given data, and allows to study secondary torrents in an axial turbine channel in detail.

The problems of building of adequate structural complex gas turbine model for hardware-in-the-loop investigation of the automatic control system behavior with system faults are discussed. The structure and technology for creation of the adequate complex gas turbine model with an example of twin-shaft bypass reheat turbo jet for hardware-in-the-loop simulation, including a special complex of models of switching between operation and reconfiguration in FADEC control-and-condition-monitoring systems with system faults are offered.