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The paper presents a procedure for gas-dynamic analysis of processes in the air-gas channel of a small-sized two-stroke combustion engine. All steps are described. At the first stage a three-dimensional model of the interior space of the air-gas channel of a piston small-power engine was built; this model was split into nine different volumes according to the methodology of volumes partition for different kinds of grids application, which is provided in source materials. At the second stage all required sizes and types of finite elements were set for the correct operation of functions of re- splitting and layer-by-layer re-formation of a grid in the cylinder volume and in the sub piston area. At the third stage all the necessary settings in the CFD-code ANSYS Fluent were made. Such as a transient simulation method, a turbulence model, parameters of mixture formation and fuel evaporation process, setup of intersection zones of the grid, setup of permeability of the boundaries between the calculated areas, setup of grid re-formation parameters, motion parameters of the piston and other moving elements of the simulated engine were introduced, setup of parameters and characteristics of the fuel injection process. User Defined Function (UDF) was used to set the rotation of the crankshaft. The calculations found fields of distribution of the basic parameters in the air-gas channel of the small-sized combustion engine, such as pressure, temperature, speed and composition of the working body. According to the simulation results power and fuel efficiency of the small-sized enginewere calculated. The technique of modeling of thermal processes in an air model small-power combustion engine is using CAD/CAE technologies was presented. The solution to this problem is one of the most important tasks in the field of combustion engines engineering. The purpose of the thermal processes modeling is visual representation of the operating principle of an air model two-stroke engine through its three-dimensional model. Simulation of thermal processes in the combustion engine is performed using ANSYS Fluent CFD-code (1). The efficiency of the combustion engine depends on a combination of complex processes, namely: fuel components supply, air- and-fuel mixture preparation, fuel combustion and combustion gases discharge, etc. The studies conducted using CFD- modeling at the early stages of the engine designing help us to optimize each of these processes. The complexity of the modeling process is associated with the analysis grid model building, which should move in line with the movement of the working bodyinside the piston engine cylinder (2). This technique can be used to obtain the fields of distribution of the main thermodynamic parameters in the piston-cylinder group of combustion engines with the help of ANSYS Fluent program, and allows to gets kills of working with moving analysis grids. 2. METHOD At the first stage a three-dimensional model of the small- sized combustion engine was built using Solid Works CAD- editor. Then with the help of volumes subtraction the internal volume of the air-gas channel of the engine was built. The air-gas channel of the engine was split into nine volumes, according to the authors' method of three-dimensional models preparation for grid elements application. As the result a three-dimensional model ready for creation of a grid model presented in Fig. (1) was built.

Gas-Dynamic Analysis of Processes in a Small-Sizes Two-Stroke Combustion Engine