Abstract
One of the most significant concepts of deep restructuring of the economic mechanism of the Republic of Uzbekistan is the creation of an integral, effective and flexible system of economic management and the implementation on this basis of a program to improve the technical level and quality of machines. The car park of our country is more replenished with vehicles with diesel engines. The development of contemporary diesel engine building is proceeding by forcing engines: increasing the average effective pressure and speed. Therefore, high reliability and service life, fuel efficiency and environmental performance are the basic criteria for their quality. Forcing diesel engines leads to an increase in thermal and mechanical loads on the basic parts of the cylinder-piston group (CPG) (piston, liner and cylinder head), a significant increase in their temperature, as well as the temperature of piston rings and valves. Overheating of parts is accompanied by the formation of temperature fields with a pronounced uneven temperature distribution and, as a result, an increase in thermal stresses with a simultaneous deterioration of the mechanical properties of the material, the formation of cracks and, finally, the destruction of the part. In this regard, the task of protecting parts from excessive exposure to high thermal loads from the working fluid becomes urgent, or, in other words, the task of creating a diesel engine with reduced heat removal from the working fluid.
Highlights
First of all, with the provision of contemporary environmental requirements, the creation of a highly efficient engine with reduced heat removal from the working fluid is associated with the solution of a number of other problems
On the basis of many years of experience gained in the creation of high-speed diesel engines, as well as a large number of works by domestic and foreign researchers on the study of the processes of mixture formation, ignition and combustion, a number of provisions can be formulated about the processes occurring in the diesel cylinder
Mixture formation, ignition and combustion are complex physicochemical processes continuously developing in time and volume of the combustion chamber, which can be conditionally divided into five periods based on the analysis of indicator diagrams (Figure 1)
Summary
With the provision of contemporary environmental requirements, the creation of a highly efficient engine with reduced heat removal from the working fluid is associated with the solution of a number of other problems. First of all, this refers to the reduction of nitrogen oxides in combustion products while simultaneously reducing the specific fuel consumption. The complexity of the conditions accompanying mixture formation, ignition and combustion of fuel does not allow a complete description of the mechanisms of physicochemical processes occurring in a diesel cylinder. On the basis of many years of experience gained in the creation of high-speed diesel engines, as well as a large number of works by domestic and foreign researchers on the study of the processes of mixture formation, ignition and combustion, a number of provisions can be formulated about the processes occurring in the diesel cylinder
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