Keywords: diesel engines.

An improved design model of the turbocharged medium speed diesel engine operation is made, based on the method of numerical simulation. Investigations are carried out, showing wide possibilities. Successful coincidence of calculation and experiment results allow lo recommend this model to forecast operation parameters similar to those of medium speed ChRN36/45 diesel engines, and also when selection or modification their heat exchange facilities.

Keywords: diesel engines.

The short systematization. of published works is given, on the use of active and passive multifactor experiments on internal combustion engines.

Keywords: diesel engines.

A method of evalution of temperature conditions of combustion chamber walls is offered, dependent on its material and heat source power. This method can be used at selection of the optimum combination of heat-physical features of the wall material and heat flow through the wall providing minimum heat dissipation into the wall at permissible amplitudes of temperature variations on the surface.

Keywords: diesel engines. Thermointensity in the calorific intensive parts is shown to be proportional to the product of power per litre by the cylinder square diameter. By analysis of constructive features of piston, cylinder header heads and cylinder liners on 60 modern transport diesel engines levels are defined, when we from constructive modification to the other.

Keywords: diesel engines.

Effect of heat interference in the cylinder block and liner valve cages is shown on the level of assembling stresses in fillets of the upper valve cage of the block and liner supporting fillet. Results are given of investigations for decrease of assembling tensile stresses in carrier cylinder block and liner elements of the engine ChN31,8/33, considering the heat interference in their valve cages at the engine operation under different conditions.

Keywords: diesel engines.

Experimental data are shown of the wear of the cylinder liner effect on operating parameters of the engine 6ChN21/2I. The cylinder head wear leads to extensive gas leakage to the cran- kcase and impairment of operating parameters, the quantity evaluation of their variation is given.

Keywords: diesel engines.

The method of calculation of heat exchange intensity is offered between the cylinder liner surface and cooling liquid. based on definition of the local heat intensiti exchange along the elemental current tube.

Keywords: diesel engines.

Results are given of experimental determination of vibration on the oscillatory power output, generated on bearing flanges of seven diesel engine —and diesel-generatodftypes. Vibration sources are analysed and methods for their decrease are offered. Analytical dependency is offered for evaluation of generated oscillatory power output on diesel engine support and its units.

Keywords: diesel engines.

A number of tasks are described, risen at simulation, analysis and evolution of crankshaft bearing operation by computer. Methods of hydro-dynamic and elastic-hydrodynamic calculations of bearings and the method of definition of bearing reliability, based on their operation simulation.

Keywords: diesel engines.

A new method of plotting static characteristics of the complex: ship hull-diesel engine VRSH is offered. This is the method of two-factor passive experiment, high accurate and suitable for any ship application.

Keywords: diesel engines.

The calculation technique of the axial motion of the oil scraper piston ring is offered relative to the piston groove and piston section turn in the motion plane. Examples of calculation are given. Recommendations of the ring design are given in order to provide self-sharpening of the operation ring scraper and reduction of a pump ring action.

Keywords: diesel engines.

A block-circuit of the automatic speed control system with the electronic-hydraulic governor is shown. It can be seen that a single pulse electronic-hydraulic governor provides control parameters on the first class of accuracy. GOST 10511—72, and the double-pulse governor provides them with a suitable margin.

Keywords: diesel engines.

Results of a full-scale experiment are shown, which took place on the cruiser «Ivan Skuridin» at the ship swinging in order to get static characteristics of input and output processes in the closed dynamic system: diesel engine-speed governor during its normal function.

Keywords: engines.

On the base of results of experimental investigations it is recommended during calculation of the radial guiding apparatus (RGA) of the fan to determine the flow take-off angle by the formula, accepted for determination of the flow take-off angle from gas turbine grids. It is pointed out that at the determination of the take-off angle of a flow from the RGA grid on the Pfleidehrer formula experimental and calculation data coincide the wrong way. A dimensionless criterion is given, which can be used for derating speed fields in RGA for different consumptions.

Keywords: engines.

A method is described for investigation of the movement speed variation and fuel and air mass distribution on the length of the non-stationary nozzle spray. The method uses an experimental stroboscopic installation, where the spray is divided into portions at diiferent distances from the nozzle, the fuel mass and number of these portions movements are measured. Experimental dafa on the movement speed variation and fuel mass distribution on the spray length are given.

Keywords: engines.

A developed universal test bed for tests of tractor diesel engine speed governor is described, where static characteristics can be defined, and evaluation of governor dynamic features on its frequency or transient characteristics is available.

Keywords: engines.

The necessity systematic approaching to the formation of the engine type explained. The reason and possibilities of the mathematical modulation for optimization of power levels are shown, and demands of customers for engines are defined.

Keywords: engines.

The method of definition of boundary conditions is offered, these conditions, using known parameters the opening before valve timing mechanism and pressure drop allow to define parameters of gas in the opening after valve timing mechanism and gas consumption through it, considering energy losses in the flow. An example of calculation and composition with experi mental data is given.

Keywords: engines.

Reasons of destruction of liners with a niresist insertion are considered. Ways on how to increase the austenite stability by the thermal treatment are described, resulting in a nickel economy and the engine reliability.

Keywords: engines.

The composition and properties of the heat-reflecting coating on the liquid glass are desctibed. The coating effect on decrease of the cylinder-piston group is shown. It is pointed out the advantage of the steady engine operation on leaning working mixture, and at the same time the increase of the fuel economy.

Keywords: engines.

Reasons of displacement of crank webs fit hot on crank- pins of powerfull marine diesel engines are taken under consideration. An example of displacement calculation at sharp stops of a crankshaft during the engine operation and study of pressing quality are given, and also recommendations on how fo avoid their displacement.

Keywords: engines.

The resistance to deformation of materials used for cylinder-piston group is analysed. The criterion for comparative evaluation of plastic material resistance is offered, influenced by operation factors.

Keywords: engines.

Problems of air pollution by exhaust gas emitted from engines are considered, permissible limits of noxious component composition in exhaust gas, accepted in USSR, USA and other national standards. Main philisophy for research work and standardisation is recommended in the field of air pollution.

Keywords: engines.

The technique of fast full-scale tests of motor oils is given with evaluation of cylinder and pitson part wear, using the method of the surface activation, and oil ageing process by modern methods of analysis. Results of comparative tests of five oil samples on ship board are given.

Keywords: engines.

Evaluation of motor oils with additives, using laboratory methods, and results of their tests in engines help to get the full information of their operating features and to find the better way to improve their quality.