Keywords: engine.

The engine pressure ratio effect on the centrifugal compressor size for the first and second supercharging stage is investigated. Ways to reduce the extent of the two-stage turbocharging system are analyzed. It is shown that the two-stage turbocharging systems are located more convenient on V-engines with the V-angle between cylinder banks increased to 50–90°.

Keywords: diesel engines.

The diagram of connection between the model optimization and an experiment, and also technique of the extremum area investigations are considered. Features are given of the purpose function in tasks of the RIC engine theory, algorithms are shown, their effectiveness for these tasks is proved by the service experience.

Keywords: diesel engines.

Unequality of mono-and-polydispersion models in calculations for combustion on diffusion dropping mechanism is shown, based on calculation experiments, using computer, it can be multifactor one. Functions of calculation outlet parameters of ChN26/26 section are given, depending on the error in definition of the injection dispersion characteristics. A variable pitch on drop fractions is reasonable for a polydispersion model.

Keywords: diesel engines.

Regularities connecting the cycle dynamic and parameters of the heat release law for a multifuel supercharged diesel engine are defined by calculation and experimental investigations. Discrepancy of measured values of maximum combustion pressure, defining local load on combustion chamber walls, is shown. These are the average values on the maximum cycle pressure extent, responsible for the thermo-dynamic improvement of the operation. Variations of parameters of the linearized heat release law at the engine supercharging are described.

Keywords: diesel engines.

Algorithm of calculation of heat flow from gas and rings is given. The heat gas flow is defined by method of Evans. Tasks of pressure distribution in spaces surrounding rings are being solved, and also thickness of the oil film beneath rings and shaping of epure for all the rings thermal load are defined. Results of calculation for the engine ChN16/17, taken as an example, are given.

Keywords: diesel engines.

An analytical method is offered, based on the theory of combustion regularity for non-mixed gases, the theory developed by J.B. Zeldovich. for definition of temperature and combustion product composition, real values of molecular variation and gas dissociation coefficient, and also kinetics of nitrogen oxide forming in a local area of the engine combustion chamber with heterogeneous combustion, which was proved during experiments on the dierfel engine D-21 with a semispherical combustion chamber in the piston. This method can be used for investigations in order to optimize the operating process and reduce toxicity on similar diesel engines.

Keywords: diesel engines.

Conditions are considered of theoretical and experimental stress definitions for parts of the engine cylinder-piston group. Ideas are given about relations between technical calculation results and measurements, attained during experiments, and error evaluation, which should be taken into account when defining the real parameter values. Recommendations are given for optimization of the calculation for cylinder-piston group part strength and selection of permissible stresses

Keywords: engines.

Method of calculation is described for a spectrum vibration on diesel engine and its units bearing flanges, caused by oil tanks, cylinder liners and frame parts. The method can be used for the frequency range of higher than 150 to 200 Hz and is based on definition of a oscillation power portion, generated by above parts in the total spectrum of the engine oscillation power. Examples of calculation on diesel engines 6Ch12/14 and 6Ch15/18 are given. Some ways to reduce the high frequency vibration of the engine units are taken under consideration.

Keywords: engines.

Effectiveness is shown of the method of the mathematical experiment planning theory to investigate the effect of constructive and service parameters on the engine sliding bearing quality.

Keywords: engines.

Approaching equation is given of a boundary of a single-stage centrifugal compressor steady operation for internal combustion engine supercharging, which is quite similar to the experiment, and also examples are given of the equation use to solve practical tasks.

Keywords: engines.

The present condition is shown and perspectives of the system development of a high temperature evaporating diesel engine cooling. The main attention is drawn to provide a water pump operation without cavitation at lower steam separator arrangement, improvement of water system hydraulic characteristics and reducing of the engine parts thermal stress.

Keywords: diesel engines.

Problems are considered about micro-computer advantages in an automatic system of diesel engine tests. Problems are studied to increase static and dynamic precision to provide the predetermined processing of results and getting information easily acceptable for an operator. A possible structural diagram of a measurement sub-system is given. Important units of a sub-system and ideology of the information exchange between micro-computer and periphery units, and also between micro-computer and the other computers are described.

Keywords: engines.

Precision of the piston treatment is calculated under conditions when the system part-instrument is a system with two freedom degrees and orienting stiffness axes. An example of the treatment precision of the engine Ch8.5/ll piston is given.

Keywords: engines.

An approximate-statistic approach is offered to solve problems of the oil replacing in diesel engines. A summarized statistic parameter is developed with MGK, allowing with a given confidence level to define deviations in the oil ageing process and evaluate its capacity in diesel engines.

Keywords: engines.

Results are given of long time service tests of a new national oil M-10DTSL20 for medium speed marine diesel engines.

Keywords: engines.

Problems of improvement of using of main industrial-production funds at factories of diesel engine industry are considered. The production union «Zvezda» is taken as an example to define the effect of potential possibilities of the union on the profit increase, the importance to develop a complex plan for the profit increase is shown, and also sequence of its development.

Keywords: engines.

Main service features of motor oils are considered in dependence on a supercharging increase of modern and perspective diesel engines.

Keywords: engines.

Methods of evaluation of the engine cost at the stage of the projection are analyzed and mathematical model for the prognostic of the master marine four stroke engine cost is offered.

Keywords: engines.

Real loss for a cylinder-piston group friction is shown of the diesel engine 4Ch13/14 (A-41), supercharged on the shaft speed up to 2100 rev/min with different completing units of piston rings: a cylinder-piston group without the oil scraper ring, then successively without lower, medium and both (lower and medium) compression rings. An optimum version of the cylinder- piston group completing units is defined on friction force values (mechanical losses), specific fuel consumption, oil consumption for melting loss and gas leakage into the crankcase.

Keywords: engines.

Investigation results are given to define permissible unbalance and unbalance moment values within planes of the engine counter balancing. Criteria are proved, and attained formulas for above parameter definition are considered.

Keywords: engines.

Technique is developed to detect defects of casted blanks for cooled pistons, using the method of a gamma-detection. This method is offered to realize the continuous non-destructive control of pistons with cooled spaces, which has been put into production of cooled pistons quite successfully.

Keywords: engines.

It is shown that during adjustment and initial weariness on the external side edge of a piston ring a curved surface is being formed. In order to decrease the ring weariness and oil consumption for melting loss the upper rings with an initial barrel-shaped surface should be used.

Keywords: engines.

Emulsion additives are shown to be perspestive inhibitors of corrosion when following a number of requirements. The list of imported (foreign) oil additives is given, widely used for national and foreign diesel engines. Experiments proved that oil additives have optimum heat resistance within the temperature range 520 to 530 K.