Vol 10, No 3-4 (2011): Special Issue

The harmonic model of thermodynamic cycle in regenerator which is a key to analyze the thermodynamic processes of gas oscillating has been established in this paper. It is shown that each parcel of gas in the regenerator undergoes thermodynamic cycle which depends on phase shift between pressure and displacement oscillations of gas.

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

Research of assembly operations on some set of admissible variants of execution in article is investigated in the form of statement of a problem of a choice of optimum model and structure systems of assemblage of the unit with an establishment of admissible parameters of transformations of technological transitions.

Thermoacoustic generator, consisting of a thermoacoustic travelling-wave engine and linear alternator 1S102MA, is being considered. Parametric analysis is carried out by method electroacoustic analogy for the design optimization. Authors received different device-performance dependencies for analysis of apparatus behavior.

The analysis of development of rotational engines has done. In our time among rotational engines rotor-piston engines, blade turbines and fan engines are known. In this article is shown that in the field of autotractor engines any of these types of rotational engines cannot be alternative to piston engines existing today. High technical and economic indicators can be received on the rotational engine of volume type of deep expansion. Such design is realised on the basis of conic fan elements. The broad machine of deep expansion ideas expressed but not realised in an industrial version of the engine. In this work it is proved a principle of blading of a fan surface on a conical rotor. The manufacturing technology is developed and the model of a rotor full-scale is executed from plastic.

This article deals with first results of tests of a tank with cryogenic charging (liquid nitrogen), which have been made at level of pressure to 4 MPa. Also it is shown that the behavior of parameters in a tank on time corresponds to calculation model.

The pipelines of engines are exposed to different variable forces influence. 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 80ºС. 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 400ºС. For that the additional measurements error doesn’t exceed 0,5%.

Propane-air wire metallizator is developed on the basis of thruster. working process modifications required for metal evaporation are examined.

Statement of a hypervector problem of conclusion the direct-flow detonation pulsing engine design to the leader is considered. Generally it is reduced to multicriteria problem of a discrete programming. The method of its decision is offered. The numerical example is resulted.

The results of theoretical and experimental investigations of the influence of the high-intensity pulse-magnetic field on the structure and properties of aluminum- silicon alloys are presented in this paper. Based on the results of the investigations the sequence of designing of technological processes of casting with pulse-magnetic processing of the melt in production of aircraft engine parts has been suggested and sampled industrially

Material MR is widely used in systems to protect against vibration. Investigated the loading of the MR damper in the radial direction rotating force that occurs when a precessing motion of the pipe or as a result of an imbalance of the shaft and at the same time in the axial direction.

The paper describes a hysteretic relaxation damping model and results of the study on its basis of dynamics of system.

According to teaching literature sources and in an engineering practice there is the rule to use the same type distribution of variable dynamic load in thread as the static one for thread strength calculation under variable acting load. Performed numerical investigation shows that it is not quite right and distribution of the dynamic load in thread can be different from the static distribution depends on thread joint elements stiffness and elastic and inertial properties of whole structure as well. External variable load factor and load distribution in thread in structures with thread joints have to be defined taking into account whole structure dynamic properties. In order to increase endurance strength of thread joints subjected to vibration it is necessary to tune off a design from any resonances.

This article deals with designing processor of internal combustion engine by CAD/CAE-system. Thermal calculation of the processes proceeding in given power installation is carried out. On real details it has been created 3D prototype model in program complexes Solid Works and the COMPASS. Further models have been exported to programs ADAMS for kinematic and dynamic calculation, ANSYS mechanical – durability of calculation, and gas dynamic calculation in ANSYS Fluent. Also the given technique allows to execute designing of pressurization and system of cooling of the engine. Using of all this programs allows to project ICE with very good.

Describes the program developed macros for the automatic modeling of the FEM-package ANSYS threedimensional surface cracks in thin-walled structures and calculate the parameters of fracture mechanics along the curved semi-elliptical crack front. In order to determine the values of J-integral method of integrating the region. We give a numerical example of modeling the outer surface cracks in the pipe and the results of calculating the parameters of fracture mechanics.

Modernization of serial engines of Open Society "Autovases" for increase of overall performance at the expense of working out of some the progressive means which realization will allow to raise technical characteristics.

Productivity of processing of aviation nickel alloys is investigated by EDM. Processing was conducted by copper and graphite electrodes, an insertion method. Dependences of productivity on frequency of impulses are received.

Complex scientific and technical requirements to the organization of a batch production of engines and the conditions predetermining necessity of working out of new technological processes of manufacturing are defined. Efficiency of new processes is shown. Realization of a complex of progressive processes of manufacturing of details and knots has allowed to receive essential increase of technical characteristics engines families "NK", their high operational reliability and resource.

Two high-speed cameras capture movement and deformation of an object which allows to compute surface stress and strain.

The problem of developing the automated system for measuring the geometry of blades for gas turbine engines (GTE) in production conditions is considered. The starting point of the study was the technological continuity requirement being implemented equipment. In the theoretical analysis, supported by the results of simulation and experimental studies the best configuration of automated systems is justified in the context of the main problem - upgrading the POMKL by replacing the optical-mechanical system with high-speed measurement system with differential sensors, integrated into real-time computing environment. The paper presents efficient control and identification algorithms for differential sensors that form the basis of multi-channel high-speed measuring system, the curvature correction algorithms and analytical description of the blades, description of hardware and software to support computing in real time. In this case the expected rate "performance/price" may reach 150-500 units per hour/1000 $ for non-comparable with optical systems, reliability and simplicity of equipment.

The methods and results of experimental research of thermal yet influence of staff LTRE with thrust from 10 N to 100 N with hypergolic propellant under continuous and impulse engaging conditions are expounded. The influence of basic thermo gas and dynamic factors on the thermal influence dimension in the near and far yet part relative to the nozzle cut is described.

Basic principles of designing and questions of engineering of spring unloading and shock-proof devices of allmetal multicomponent dampfers on material МR basis are considered.