Vol 11, No 3-1 (2012): Special Issue

The article deal with pressure pulsation dampener (PPD) which reduce noise emitted by the valve. The results of numerical simulation and experimental study of the PPD. As a result of the work and tests, the efficiency of the pressure pulsation dampener was 10,6 dBA.

The ways providing simultaneous increase of wear resistance, decrease in noise level and the vibration generated in knots of a friction are considered. The offered technologies are connected with formation containing fluorine the microdimensional films raising wear resistance, contact weariness and durability of connection of a lubricant layer with friction surfaces; the microreinforcing of superficial defects which is slowing down development of fatigue damages; the effect of multigreasing raising loading characteristics of a lubricant layer and its absorbing ability.

The evaluation of the noise exposed area during the landing and take-off cycle is performed. The calculations based on two different methods provide satisfactory results and show the decrease in the noise exposed area with the implementation of the alternative piloting techniques for approach operations. In some take-off cases application of the alternative piloting techniques does not result in decrease of the noise exposed area.

The results of studies of the effect of ultrasonic hardening of relaxation of residual stresses and strain hardening in titanium alloys. Shows the influence of processing parameters on the intensity of the stresses and strains.

In this article are considered reasons limiting applicability of model-based adaptive control. Also it’s offered way of the adjustment to linear model in operation with changing of engine’s conditions.

Bull nose end mill design is represented. A method to create a control program for end mill fabrication using special software, supplied with ВЗ-30Ф4 grinding machine is described.

The problem solution of conjugate heat transfer in thrust chamber cooling jacket of liquid rocket engine is considered. Finding design data is compared with experiment.

The mathematical model is submitted for definition of rational conditions of processing at the diamond smoothing, consisting of linear objective function and linear restrictions – inequalities. As objective function the equation determining machine time of processing is used, and as restrictions – inequalities, the restrictions connected in functional parameters and parameters, determining quality of processing.

Performed a computer experiment for the flow of an incompressible viscous fluid under a constant pressure drop in an annular channel formed by the cylindrical and conical surfaces between the axes of which there is eccentricity. Based on the results established certain regularities and characteristics of the turbulent flow, and obtained an engineering formula to calculate the coefficient of hydraulic resistance.

The article issues of application fuzzy logic controllers for the automatic control electronic systems gas-turbine engine is research. A comparative analysis of transient performances a fuel flow control loop with fuzzy logic P controller and line PID controller for the deterministic line system, system contenting dead zone and deflections of parameters invariable part of system comparative them nominal value has been made. As a result of the comparison the best controller has been chosen. Conclusion about of appropriateness using fuzzy logic controllers for the automatic control systems gas-turbine engine has been made.

Creation of viscometers has been considered for observation and identification of parameters of non-Newtonian fluids. In the paper, problems of measurement of viscosity and changes of temperature of hydrocarbons under the pressure of more than 150 MPa are considered.

The basic methodological principles for the design of plasma technology for protective coatings gas-turbine engines. The parameters of the control system and the technological properties of the coatings.

The surface films element structure after ECDM of the alloy ЖС6У was investigated by an X-ray method. It is established that film properties at electrochemical dimensional machining of a heat resisting alloy ЖС6У in various electrolytes are defined generally by nickel and cobalt component, as their influence in a film is solving.

The results of research in the sphere of enhancement of efficiency and reliability of the eddy current testing and determination of the minimal size of the revealed fatigue cracks are presented here. The most essential factors influencing on the detectability of the fatigue crack are researched. The methods and technology of the reliable defectoscopy are developed by means of defectoscope D-5.

The structure, phase composition and strength of long-term high-resource complex protective coatings for heat-cooled turbine blades from single-crystal nickel-base alloys.

The method of calculation of interaction of exhaust jets of RP on various propellants with atmosphere for estimation of ecological safety of firing of rockets and launchers is developed. The model considers non-equilibrium physical and chemical processes, including reactions with ozone, nitrogen-containing and chlorine-containing components, wave processes, process of turbulent mixing, interaction between particles of the condensed phase and gas. The method of calculation is approved on example of influence on ozone cloud of jets atmosphere of SRM LV «Space Shuttle» and LV «Titan» and LRE LV "Proton" (fuel NTO-UDMH) and LV "Angara" (fuel kerosene-oxygen).

Two models of high-durability DC arc plasmatron that has been used for fuel-air mixture reformation aiming at plasma support of fuel burning in an internal combustion engines were investigated.

Some problems to create a liquid rocket engine reusability of oxygen in fuel - liquefied natural gas, which uses the shaft turbopump unit two turbines, one of which runs on gas with an excess of oxygen, and the second - on the gasified fuel in the cooling path. Made an experimental model, conducted fire tests and obtained its main characteristics.

We offer the production of synthesis gas by means of power saturated technology of a steam and carbon dioxide reforming with use of an exhaust of gas turbines and as use of screw multiphase pumps for Slarri-process on iron catalysts, which possess big advantages.

The results of investigations of the influence of on afterhardening the temperature glass transition PKM

The results of nondestructive testing of blades of axial compressor of aviation engine of gas-pumping unit are represented. The experimental investigations were based on ultrasonic pulse-echo method. The opportunities of the nondestructive acoustical method for the studying of the steel structure during the exploitation of blades are demonstrated.

This article dedicated to some questions of seals to rotor dynamical characteristics.

Consideration is being given to the possibility of using dynamic spin rigs for investigation of turbomachine blade vibrations damping and optimization of structural damping. Investigation results of vibrations damping are presented for turbine and compressor blisk blades and turbine wheel with inserted blades.

Some theoretical questions and thermodynamic cycle of bypass engines with mixing are analyzed in the article. The formula for optimum cycle parameters providing the maximum efficiency are derived and some comments are presented. The computer investigation with the new formula using is performed. The main results of computer investigation are analyzed and presented.

In this article the short review of the problem of cooling high-power electronic components by impinging jets at various initial conditions is presented. Experiments of researching the heat emission for boiling R-134a on microribbed and microroughed surfaces at the conditions of stationary heating are made. Graphics of dependences of density of the heat flux on distance between the channel and the effective surface are presented. Influence of the form of the channel on the temperature profile is positioned.

It is proposed the classifier of solid stamped impellers used in gas and hydraulic impeller machines produced by hoy (semi-hot) stamping, which were produced in aviation industry. Article recounts information about research and development of schemes and structures of the multisectional stamps, non-dismountable (tyre supported) and dismountable wheels after forming. Extruding insertions are being pulled from interblade channels. It is considered the principle of constructing theoretical cylindrical lattices of channels for multi-split stamps, due to which it is possible to calculate the forces of disclosure in stamps’ channels and rotational forces of the compound matrixes during extrusion.

This paper presents a flow stabilizer configuration intended for maintaining regular rated propellants flow through a thruster and also reducing time of transition to steady state mode for any thruster firing in wide range of output parameters.